DIY Loudspeaker
Copyright 2023 © Troels Gravesen, Denmark

Page Index     Updates      Builders Response     For Sale     News, 25th Sept 2023


Welcome to my website! Below you will find articles on some of the work done over the last two decades. Building speakers has be on and off for more than forty years since high school, and with the availability of PC-based measuring equipment in the Nineties my hobby took another direction, as it became very much clear, that doing crossovers by calculation and fine-tuning by ear had its shortcomings.
Over the years my focus has moved from small and inefficient speakers to larger constructions providing less distortion and increased dynamics, things that make reproduced music live and engaging. Below you will find speakers ranging from 2 to 300 litres volume and I hope you will find inspiration for your next DIY project or buy one of the kits from Jantzen Audio.

In case you want advice on which speaker to build, please read both "choices" and "crossovers" before writing. I shall not recommend any speaker for reasons outlined in the "choices" file, and please do not ask about the sonic differences between two speakers. What I hear is unlikely to be what you will hear.
Sorry, but time doesn't allow assisting in any hypothetical combination of drivers of your own choice, nor up-grade of newer commercial speakers as well as renovation of vintage speakers not listed below.
Should you run into problems with the constructions presented here, I'll do all I can to assist in successful implementation.

Designing loudspeakers is not necessarily rocket science. Designing loudspeaker drivers is another thing, but picking 2-3 drivers and making a suitable cabinet and crossover is basically a matter of handling fairly simple measuring equipment, simulation software - and experience. Some call the voicing of speakers an art. I don't think so. Voicing a speakers is a matter of taste like adding spices to a stew. Some like it hot, creamy or crunchy - some don't. The ancient Greeks didn't distinguish between art and craftsmanship. Same thing. Something may be art if enough people think it is.

Since 2014, all schematics are closed, i.e. crossover components' values only comes with purchase of the kit. The reason for this can be read here. Crossover schematics cannot be bought alone.

All technical questions, contact:

For purchase of kits, contact:

None of the constructions, illustrations or information presented here may be used for commercial purposes and cannot be licensed. Download terms of use here:


The constructions are divided into sections based on the main driver in the system, e.g. ScanSpeak, SEAS, SBAcoustics,  AudioTechnology and Purifi.
I'm very fortunate to be sponsored by these companies and without their generous support, very little of this would have been possible. Unless specifically stated, all constructions are based on my own preferences and I may combine drivers from different manufacturers if I think they will make good partners. Drivers from Faital, BMS and 18 SOUND are not sponsored by the companies and are all out of my own pocket, but I strongly feel quite a few products from the PA world are more than suitable for hifi application.

All underlined text is a link, regardless of font properties.

Regarding frd and zrd files for crossover simulation: I do not provide these from my library and please do not send your own for evaluation.

The common habit of anonymity on discussion forums is sad, I think. Why should we spend time with nobody in cyberspace? You must be somebody. If you have questions or comments, please state your name and the country you live in to give me an idea of the hifi environment you live in. Feel sure I need your response to make this website better.

I have a lot of mails and answering takes time and please do not feel neglected if my reply is short. I regard all communication between you and me as personal, so do not post my comments or graphics on discussion forums, websites, etc. without my written consent.

ScanSpeak Constructions











Speakers combining various brands:
ScanSpeak, SBAcoustics, AudioTechnology, Viawave, Peerless, BMS, Faital, 18 SOUND, Purifi.



SBAcoustics Speakers



SEAS Constructions



Constructions based on the 8008-HMQ high-efficiency driver


Center speakers

Subwoofer and bass module

AudioTechnology Constructions


Up-Grade Kits for Vintage Speakers


Should I up-grade my vintage speakers? Read here.

Vintage speaker and high-efficiency stuff

My reference system
Click image or heading to go to:


Recent up-dates      Builders' response     News

Speaker constructions featuring drivers from:





High Efficiency Speakers

Mix of drivers from various manufacturers, ScanSpeak, Purifi, Peerless, Faital, BMS, 18 SOUND. 

The Jenzen speakers, 3-way transmission line designs

Up-Grade Kits: JBL L100, Tannoy MG15, YAMAHA NS1000M


Center speakers for surround sound

HYPEX, PAGES on the use of Hypex FUSION plate-amp/DSP modules

Open baffle speakers

Vintage speakers, JBL Tannoy, Wharfedale, Goodmans, etc

Tests and revies

Feature articles, tips, ideas,  cabinet damping, coils, etc.

Tips & Ideas

My system


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Nothing for the time being.

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BOLD = new speaker constructions or significant updates.

25-09-2023: SEAS NEXTEL-2F
16-08-2023: ScanSpeak Ellipticor-2F8
21-07-2023: ScanSpeak Ekta-7741
12-06-2023: ScanSpeak Discovery-18W-mkII
02-05-2023: ScanSpeak Ellipticor-A50-mkII
02-05-2023: ScanSpeak Revelator-51
17-04-2023: Response to ScanSpeak A50
17-04-2023: Testing SBAcoustic front grills
13-04-2023: Beryllium version of Discovery-3WC-10
17-03-2023: ScanSpeak Ellipticor-A50 at AXPONA 2023
06-03-2023: ScanSpeak, Discovery-3WC-10
10-01-2023: ScanSpeak, Ellipticor-A50
03-01-2023: Purifi-Fa

22-12-2022: Some Ellipticor Christmas fun
26-11-2022: Purifi-Be
15-11-2022: FUSION-22, 3-way classic, SBA TX units
30-09-2022: New Jantzen Audio MKT-Z capacitors for bass crossovers
28-09-2022: ScanSpeak Revelator-851, now with Be dome option
27-08-2022: SBAcoustics, SBA-7MD, 3-way transmission line
30-07-2022: My second pair of Illuminator-71 and some hifi history
30-07-2022: My workshop turntable
12-06-2022: ScanSpeak Revelator-66
25-05-2022: Room-gain, a case study
25-05-2022: Revelator-851, revisisted
20-05-2022: ScanSpeak Ellipticor-A50-mkII
08-04-2022: ScanSpeak Illuminator-CENTER
06-04-2022: SEAS-CENTER-PRESTIGE, update.
17-03-2022: ScanSpeak Discovery-81
20-02-2022: ScanSpeak Revelator-851
13-01-2022: Faital-3WC-10 update. Now with Be dome option
13-01-2022: Passive to active: Convert a passive design to fully active

17-12-2021: Purifi 6661 floorstander
10-11-2021: SBAcoustics, SBA-861PFCR,
high-performance/low-cost floorstander
16-10-2021: ScanSpeak Illuminator-71,
2-way stand-mount or floor-stander
01-10-2021: Purifi-6R,
2-way stand-mount from Purifi and Viawave drivers.
03-09-2021: ScanSpeak Illuminator-7751,
successor of popular Ekta Grande
28-07-2021: Faital 3WC-10
04-04-2021: Inverted polarity, what is it? I'm afraid we need to spend a little time here.
23-03-2021: ScanSpeak Discovery MTM
25-02-2021: ScanSpeak Discovery 3WC mkII
20-01-2021: New SEAS W12CY006 midrange driver for CNO-GRANDE and CENTER-641

31-12-2020: The Loudspeaker-III
17-12-2020: SEAS CNO-4, with new W18NX003 midbass
17-12-2020: New SEAS W18NX003 midbass driver
07-11-2020: ScanSpeak Discovery-CENTER
24-10-2020: ScanSpeak Discovery-861, 2½-way floorstander
03-10-2020: Use a Hypex FA251 or FA501 as a power amp for bi-amping
11-08-2020: Page with links to all Hypex files
07-08-2020: Thöress EHT Integrated amplifier. Can you handle the truth?
04-08-2020: Faital 3WC-15, 15" version of the Faital 3WC
19-07-2020: TEST: 6" and 8" midrange drivers
19-07-2020: TEST: Purifi PTT6.5-W04 6" midbass driver
19-07-2020: TEST: Viawave GRT-145W-8, ribbon tweeter with waveguide
08-06-2020: Test Audio Technica ART1000 cartridge
04-06-2020: Cabinets for the Faital 3WC available from EBEL Holztechnik
10-04-2020: Edge-coating of drivers
04-03-2020: Update to Ellipticor-3 speaker. Hypex FA501 plate-amp/DSP, high-level input
16-02-2020: Testing ScanSpeak D2104/712000 3/4" dome tweeter
13-02-2020: The Loudspeaker-2
13-02-2020: More Faital 3WC stuff, Beryllium version

26-12-2019: Faital 3-Way Classic, 93 dB sensitivity, stunning dynamics
08-12-2019: ScanSpeak Ekta-25, 2½-way, 18W/8542-10/D2608/913000
19-11-2019: ScanSpeak Ekta 2D, digital 2-way
15-10-2019: Up-date on Hypex FA251 and FA501 for FUSION-BAD and MUN-17 speakers
29-08-2019: SEAS CNO-GRANDE
08-08-2019: Edge-coating and linear distortion, prelude to CNO-GRANDE construction
08-08-2019: New copper foils caps, AMBER-Z, from Jantzen Audio, review
28-07-2019: SEAS CNO-25-mkII, new crossover and time-aligned drivers

26-07-2019: SEAS CNO-mkIII, update to a popular construction
03-06-2019: Bass module for SBA-741 and other smaller 5-6"+1" stand-mounts
23-05-2019: Müll oder gut für ein Schlechtwetterprojekt? Vintage Isophon P25A.
18-05-2019: SBAcoustics SBA-741
09-05-2019: ScanSpeak Studio 101 mkII
06-05-2019: High-pass filter for power amps
11-03-2019: SBAcoustics, SBA-761, floor-stander, 1st order filter
05-01-2019: Loudspeaker Modelling by Geoff Hill

View all updates


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26-09-2023: ScanSpeak, Ekta-mkII, built by Benjamin
25-09-2023: SEAS Jenzen-NEXT/T29, built by Ronald
24-09-2023: Faital-3WC-15, built by Martin, Germany
16-09-2032: SEAS PMS, built by Graeme, NL
05-09-2023: Open Baffle, OBL-15, built by Bartlomiej
01-09-2023: The Loudspeaker-1, built by Dave, US
31-08-2023: SEAS CNO-4, built by Damien
30-08-2023: ScanSpeak 10" subwoofer, built by Michael, Denmark
30-08-2023: Faital-3WC-10, built by Hugo
07-08-2023: ScanSpeak Ekta-7741, built by Dante, Australia
06-08-2023: DTQWT-mkIII-212, built by Tomas, Lithuania
13-06-2023: The-Loudspeaker-1, built by Paul, US
09-06-2023: ScanSpeak Revelator-851, built by Matthew, US
09-06-2023: ScanSpeak Revelator-851, built by Alain, New Zealand
07-06-2023: ScanSpeak Illuminator-7751, built by Adam
02-06-2023: ScanSpeak Discovery-861, built by Frank, Germany
02-06-2023: Faital-3WC-10, built by Thomas, Germany
19-05-2023: SBAcoustics, SBA-7MD, built by Thomas, US
28-04-2023: Faital-3WC-10, built by Adrian
26-04-2023: ScanSpeak Discovery-861, built by Jason, UK
26-04-2023: ScanSpeak Revelator-851, built by Jason, UK
17-04-2023: Update on SEAS CNO-4, built by Jason, UK
14-04-2023: FUSION, built by Georgios
14-04-2023: ScanSpeak Ellam-XT, built by Pierre-Francois, France
11-04-2023: The Loudspeaker-II, built by Bill
06-04-2023: Tannoy MG15 upgrade, done by Nick
06-04-2023: ScanSpeak Ellam-98-mkII, built by Robert, UK
05-04-2023: SBAcoustics-3WC, built by NN
04-04-2023: DTQWT-mkIII, built by Rinze
03-04-2023: ScanSpeak Ellipticor-A50-II, built by William, US
30-03-2023: JBL L100 upgrade kit, built by Kevin, Canada
27-03-2022: Response from my FUSION-22 buyer
22-03-2023: ScanSpeak Ekta-25, built by Dan
08-03-2023: ScanSpeak, Revelator-851, built by Steve, US
15-02-2023: Peerless/ScanSpeak NOMEX-164-mkII, built by Dave
12-02-2023: Faital-3WC-12, built by Jesse, USA
02-02-2023: Faital-3WC-10, built by Eelco, The Netherlands
01-02-2023: ScanSpeak Revelator-851, built by Magnus, Sweden
29-01-2023: The Loudspeaker-3, built by Dominic
29-01-2023: SEAS CNO-GRANDE, built by Adam, Poland
25-01-2023: Purifi-6R, built by Jeff
20-01-2023: Faital-3WC-10, built by Peter, The Netherlands
19-01-2023: Faital-3WC-12, built by Soeren, The Faroe Islands
14-01-2023: ScanSpeak Revelator-851, built by Rafal, Poland
13-01-2023: SEAS CNO-4 and Ekta-mkII, built by Jason, UK
06-01-2023: Faital-3WC-15, built by Kolja, Germany
06-01-2023: Faital-3WC-15, built by Will, US
05-01-2023: ScanSpeak Illuminator-71, built by Mark

19-12-2022: The Loudspeaker-3, built by Christopher
15-10-2022: Faital-3WC-10, built by Tim, USA
14-12-2022: Faital-3WC-10, built by Richard, Amsterdam
12-12-2022: TQWT-mkIII, built by Predrag, Slovenija
06-12-2022: ScanSpeak Jensen-1071, built by Jaroslaw, Poland
05-12-2022: ScanSpeak Discovery-3WC-mkII, built by Decher
05-12-2022: ScanSpeak Discovery 18W, built by Jan, Slovakia
25-11-2022. SEAS CA18RLY/22TAF-G, built by Alex, Ukraine
24-11-2022: SBAcoustics, SBA-MTM, built by Allan, Denmark
21-11-2022: FUSION-BAD, built Petr
29-10-2022: ScanSpeak Ekta mkII, built by Marshall
28-10-2022: Faital-3WC-10 and -15 built by Koenraad, Belgium
22-10-2022: ScanSpeak Discovery-861, built by Joel, Denmark
21-10-2022: Further comments from PieterJan on his The Loudspeaker-1
20-10-2022: Faital-3WC-10, built by Ole, Norway
12-10-2022: SEAS CNO-4, built by Lars, Sweden
05-10-2022: ScanSpeak Discovery-81, built by Dave
02-10-2022: ScanSpeak, Ekta-25, built by Dan
02-20-2022: The Loudspeaker-2, built by Noam
30-09-2022: SBAcoustics, SBA-16-MTM, built by Marcel (pdf file)
28-09-2022: DTQWT-mkII, built by Luc, Canada
28-09-2022: Faital-3WC-10, built by Przem
16-09-2022: Faital-3WC-10, built by Lars, Sweden
14-09-2022: SEAS Jenzen-ER, built by Sandro, Chile
06-09-2022: Faital-3WC-10, built by Jarkko
03-09-2022: ScanSpeak Discovery-CENTER, built by Chadd
16-08-2022: Faital-3WC-10, built by Walter
16-08-2022: ScanSpeak Ellam-Discovery-15, built by Gaetan, Canada
13-08-2022: SBAcoustics, SBA-861-PFCR, built by JD
12-08-2022: Faital-3WC-10, built by Joe
06-08-2022: SBAcoustics, SBA-16-MTM, built by Berat, Denmark
01-08-2022: SEAS CNO-GRANDE, built by Jay
29-07-2022: Vifa PL14 projects, built by Steve, Australia
20-07-2022: ScanSpeak Ekta mkII, built by Michael, Italy (concrete cabinets!)
06-07-2022: Faital-3WC-10, built by Riccardo
02-07-2022: The Loudspeaker-2, built by Philipp
29-06-2022: SBAcoustics, SBA-761, built by John
26-06-2022: ScanSpeak Ekta-25, built by Chris
26-06-2022: The Loudspeaker-3, built by Wei
19-06-2022: Faital-3WC-10, built by Bruno, Italy
14-06-2022: SEAS CENTER-641-NEXT, built by Petri, Finland
04-06-2022: Peerless NOMEX-164-mkII, built by Paul, Canada
29-05-2022: Open-baffle: OBL-15, built by Andrea
25-05-2022: Purifi-6R, built by Bran
18-05-2022: ScanSpeak Discovery-18W, built by Attilio and Moreno
17-05-2022: ScanSpeak Illuminator-MONITOR, built by Malik
15-05-2022: ScanSpeak Discovery-861, built by Alberto, Italy
02-05-2022: ScanSpeak Discovery-861, built by David, Spain
22-04-2022: SBAcoustics, SBA-861-PFCR, built by Sebastian, Sweden
16-04-2022: The Loudspeaker-3, built by Dominic
14-04-2022: TQWT-mkIII, built by Pablo, Argentina
13-04-2022: ScanSpeak Discovery-861, built by Leo
13-04-2022: ScanSpeak Discovery-861, built by Greg, US
10-04-2022: Illuminator-71, built by Tommy, US
10-04-2022: Faital-3WC-10, built by Christian, Italy
06-04-2022: ScanSpeak Revelator-4R, built by Jody, US
04-04-2022: Faital-3WC-12, built by Itsik
26-03-2022: Faital-3WC-10, built by Marian, Romania
23-03-2022: SBAcoustics, SBA-861-PFCR, built by Mircea
16-03-2022: ScanSpeak Discovery 3WC-mkII, built by Timo, Finland
10-03-2022: ScanSpeak 10" subwoofer, built by Jason
09-03-2022: SEAS, Poor Man's Strad, built by JC
06-03-2022: Faital-3WC-10, built by Marko, Croatia
03-03-2022: Faital-3WC-15, built by Peter, The Netherlands
01-03-2022: DTQWT-mkIII, built by Simas, Lithuania
27-02-2022: The Loudspeaker-3, built by Dominique, France
26-02-2022: ScanSpeak Illuminator-Monitor, built by Thomas, US
23-02-2022: SEAS Jenzen NEXT, update on build by CC Li, Hong Kong
22-02-2022: Purifi-6R, built by Roberto
15-02-2022: Faital-3WC-15, built by Bartlomiej, Poland
18-01-2022: ScanSpeak Illuminator-7751, built by Mike
18-01-2022: TQWT-mkIII, built by Jose, Spain
14-01-2022: SEAS Jenzen-NEXT, built by Dieter
11-01-2022: ScanSpeak Illuminator-7751, built by Goran
06-01-2022: Faital-3WC-10, built by Reto
04-01-2022: Faital-3WC-15, built by Stephan
01-01-2022: Purifi-6R, built by Paul

Go to all builders' response 2008-2021, chronologically

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HES, High-Efficiency Speaker Constructions

Read feedback from HES builders here.

Some thoughts here on high-efficiency speakers:
Intro to range of high-efficiency speakers:

The Loudspeaker-I

The Loudspeaker-II

The Loudspeaker-III

Faital 3WC-10

Faital 3WC-12

Faital 3WC-15


Speakers based on the JA8008-HMQ high-efficiency driver

JA8008-HMQ driver, the heart of the HES speakers below

TQWT/DTQWT-mkIII, JA8008-HMQ - SEAS T35C002/waveguide

DTQWT 212 mkIII, JA8008-HMQ+T35C002/waveguide + 2 x Eminence Deltalite II 2512

8008-CENTER mkII, for the complete 8008 surround set, built around JA8008-HMQ/T35C002 drivers

QUATTRO mKII, 2-way monitor/standmount from JA8008-HMQ/T35C002 drivers

TQWT/DTQWT mkIII FLAT, for those who want to upgrade the mkI/II speakers

8008-CORNER, speaker for near-wall placement

2016 OBL-15, the successor of OBL-11, now with the new JA8008-HMQ driver

Read here about the MKII versions and some background that may not be included in the mkIII articles:
TQWT mkII: 2-way tapered quarter-wave design, JA8008+TW034/waveguide
DTQWT mkII: 3-way double tapered quarter-wave design, JA8008+TW034/waveguide + 2 x Eminence Deltalite II 2510

JA8008 used in open baffle constructions:
OBL-15, the successor of OBL-11, now with the new JA8008-HMQ driver
OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB
OB-09, open baffle construction, JA8008/TW034 and Eminence Deltalite II 2515, 15" bass driver
OB-07 open baffle experiments, Supravox 215RTF + JBL LE26/waveguide + Goodmans Axiom 150 mkII

Background experiments:
Tweaking the DTQWT, incl. intro to TQWT-mkII and DTQWT-mkII
DTQWT experiments, JBL LE26/waveguide + Goodmans Axiom 150 mkII, Supravox 215RTF

Amplifiers for TQWT and DTQWT; some general thoughts on suitable amplifiers

DTQWT, 10 or 12 inch. Which should I build?

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Scan-Speak Constructions

Click heading or image to go to ScanSpeak constructions' overview


3- to 5-way constructions









Ekta mkII

Discontinued until further.




Jenzen Illuminator

Ekta Grande

Jensen 1071

Classic 3-ways stand-mount

Discovery 3WC

2½-way floorstanders


2-way floorstanders

Discovery MTM

Bookshelf speakers


ScanSpeak Center Speakers




2-way stand-mount





Studio 101 mkII




Ellam-9800 mkII


ScanSpeak subwoofer

ScanSpeak 10-12" subwoofer

Other ScanSpeak stuff

Testing D3004/660000 vs D2608/913000.htm
Testing ScanSpeak D2104/712000 3/4" dome tweeter
ScanSpeak Micro. 5F/8422T01, the smallest speaker I've ever made
Test Scan-Speak 5F/8422T01 and 10F/8414G10 full range mini drivers
Test of ScanSpeak tweeters, D3004/660000 and D2904/710003, D3004/6640 Beryllium dome and D2908/7140 Beryllium dome
Waveguide for ScanSpeak D2904/710003 tweeter
ScanSpeak waveguides

Discontinued  (Jantzen Audio does not support these kits any more and you have to source components locally)
Some Kit Instructions can be bought from me. Payment by PayPal to my account.

MUN17-3W, 28W/4878T00 + 18M/8631T00 + D2908/714000
(Kit Instruction with schematics and parts list can be bought)

Discovery 18W, 18W/8434G00 + R2604/832000 (Kit Instruction with schematics and parts list can be bought)
Revelator 4R, mini from 15W/4531G00 and R2604/832000 (Kit Instruction with schematics and parts list can be bought
ScanSpeak 3W-Classic - Classic, 21W/8550-00-13M/8640-00-R2604/833000 (Kit Instruction with schematics and parts list can be bought).
ScanSpeak 3W-Classic - Classic, 21W/8550-00-Eton 4-300-25Hex, R2604/833000 (Kit Instruction with schematics and parts list can be bought)
ScanSpeak 3W-Classic - Classic, 21W/8550-00-Vifa PL11WH09-08-R2604/833000 (Kit Instruction with schematics and parts list can be bought)

ScanSpeak Ekta-2D, fully digital 2-way with Hypex FA122 (Kit Instruction with schematics and parts list can be bought)

Ellam-FLEX, 2-way, 15W/8530K00 + D3004/660000

Ellam FLEX 3W, 3-way from 22W/4851T00, 15W8530K00, D3004/660000, R3004/662000
Illumina-66, 18WU/4741T00 and D3004/660000 or R3004/662000
Illuminator Monitor, 18WU/8741T00 and D2904/710003
DISCOVERY 12W, built a small high-quality 4 litre mini
Compact Studio Monitor, 18W/8545-K00 + R2604/832000
Ellam Discovery 15
SP44, 3-way, 18W/8530-G00 + Accuton C44 + Hiquphon OWI
SP38/13, 18W/8531-G00 + D3806/8200 + D2010/8513
STUDIO 101, 18W/8542-00 and SEAS 27TFFC tweeter

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FUSION speakers, mix of drivers from various manufacturers:

FUSION (BMS, ScanSpeak/SBAcoustics)
(BMS, ScanSpeak/SBAcoustics)
(BMS, ScanSpeak/SBAcoustics)

Faital 3WC-10 (Faital, ScanSpeak)
Faital 3WC-12 (Faital/ScanSpeak/SBAcoustics)
Faital 3WC-15
(Faital/18 SOUND/SBAcoustics)

The Loudspeaker I (BMS/18 SOUND/various super-tweeters)
The Loudspeaker II
(BMS/18 SOUND/various super-tweeters)
The Loudspeaker III (18 SOUND bass and horn and Faital midrange)

Purifi-Fa (Purifi/SBAcoustics)
Purifi-Be  (Purifi/SBAcoustics)
Purifi-6661 (Purifi/SBAcoustics)
Purifi-6R (Purifi/Viawave)  Discontinued until further.
ATELL-3 (Viawave/ScanSpeak/AudioTechnology) Discontinued until further.
(ScanSpeak/18 SOUND/BMS)
Jenzen Accu
Jenzen ATS (AudioTechnology/ScanSpeak)
Peerless NOMEX-164 (Peerless/ScanSpeak)


SEAS Constructions

Click heading or image to go to SEAS constructions' overview.

Back to Index


SEAS CNO-4, with new W18NX003 midbass

SEAS NEXT4 speaker construction


SEAS NEXTEL-2F, W18NX003 + T29CF002, Faital 10RS350 bass

CNO-GRANDE, 2 x W18NX003 + W12CY003-EC + T29CF002

Jenzen SEAS NEXT T25 and -T29. The luxury versions of Jenzen SEAS ER

Jenzen SEAS ER, high-end sound from budget drivers

Poor Man's Strad, CA22RNX+MCA15RCY+T27TFFC

3-Way-Classic-mkII, CA22RNY+MCA12RC+27TFFC





SEAS CNO-25-mkII, 2 x W18NX001+T29CF002


CNO-mkIII, W18NX001 + T29CF002


SEAS CURV, mini two-way from SEAS U16/RCY/P and SEAS 29 TFF/W


DISCONTINUED (Jantzen Audio does not support these kits any more and you have to source components locally)
Acapella NEXT, W22NY001+W18NX001+T29CF001
SEAS 5INCH minis, CA15RLY, W15CY001, W15LY001, 22 TAF/G
W15CY001 + Hiquphon OWI
Scoperta, mini TLs, W15LY001 and ScanSpeak D2608/913000
CA18RNX, 2½-way floorstander, 2 x CA18RNX + 27TDC  
Eekels' minis, W12CY003+22TAF/G
Acapella SEas, W22EX001+W18EX001+T25C003
TJL3W, W18E001+W12CY001+HIQUPHON OWI download TJL3W, large graphics, zip file
Poor Man's Strad-EXCEL, W22EX001+W15CY001+27TFFC
W15CY001 + NeoCD3
TJL2W, W18E001 + T25CF001
T14RCY+SS/8513 or Hiquphon OWI
SEAS W17EX001/SS-8513
W11XT, W11CY001
Acapella SE (single pdf file)
Acapella LWJ, Acapella SE and Acapella SEas constructions (pdf) download
Acapella SE drawings, zip file
Point75i, SEAS L22RN4X-P + W15CY001 + Expolinear NDRL81
Point75A&B, ScanSpeak 18W/8535+SEAS W15CY001 + Expolinear NDRL81/alt. NEO3PDR (pdf)

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The Jenzen Speakers


What are the Jenzen speakers? Read here about the rationales behind the speakers
Also check out how a range of 6" drivers perform on the Jenzen front panel

Jenzen Illuminator, 3-way TL design from ScanSpeak W26/8861T00, 18WU/8741-T00 and D3004/660000

Jenzen NEXT, 3-way TL from SEAS W26FX002, W18NX001 and T25C003/T29CF002

Jenzen SEAS ER, 3-way TL design from SEAS CA26RFX, ER18RNX and T25CF001


Jenzen speakers no longer supported by Jantzen Audio.

Jenzen ATS, AudioTechnology 10C77/18H52 and ScanSpeak Be dome

Jenzen Accu mkII, 3 way TL from Audio Technology 10C77-25-10-KAP, Accuton C173-6-191E and Accuton C30-06-024

Jenzen D mkII, 3 way TL from Audio Technology 10C77-25-10-KAP, Accuton C173-6-191E and Jantzen Audio diamond JDT1024

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ScanSpeak Illuminator-CENTER




8008-CENTER mkII, for the complete 8008 surround set, built around JA8008-HMQ/SEAS T35C002

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AudioTechnology Constructions

Click heading or image to go to Audio Technology constructions' overview

ATS4-HE, high-efficiency version of ATS-4. Active DSP bass section

ATS-4, AudioTechnology, ScanSpeak and Jantzen Audio

AudioTechnology 3-Way Classic

Jenzen ATS, 10C77 bass, special 18H52 mid and ScanSpeak Be dome



ATELL-3, ScanSpeak/AudioTechnology/Viawave  Discontinued until further.

ATiRi, two-way stand-mount  Discontinued until further.

PRELUDE, 10C77, 15H52 mid, ScanSpeak 9900 tweeter  Discontinued at Jantzen Audio

AT-SW, 18H52 midbass and SWANS planar tweeter  Discontinued at Jantzen Audio

AudioTechnology 10C77 sandwich cone bass driver. Pre-study for new 3-W project

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Open baffle constructions

OBL-15, the successor of OBL-11, now with the new JA8008-HMQ driver

OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB, discontinued.

OBL-9, 2009 open baffle construction with JA8008/TW034 and Eminence Deltalite II 2515, 15" bass driver, discontinued.

OBL-7, Goodmans Axiom 150 mkII + Supravox 215RTF64 + LE26 dipole panel, OBL experiments.

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ScanSpeak subwoofer 26W/4558T00-26W/0-00-00,  30W/4558T00-30W/0-00-00 and Hypex FA251/FA501

Hypex FUSION pages for the various constructions
where Hypex plate-amp/DSP modules are used.

Links to websites Links to speaker constructions
Hypex FUSION FA501 The Loudspeaker-1
  The Loudspeaker-2
  The Loudspeaker-3
  ScanSpeak Subwoofer, 10-12"
Hypex FUSION FA252 Ellipticor-4
Hypex FUSION FA122 Ekta 2D
  The Loudspeaker-3, level 2
  SBA-741 + bass module
  ScanSpeak subwoofer 10"


















Go to page with all Hypex files here (except Ekta 2D)

All Hypex related pages (for my own recollection):

Use a Hypex FA251 or FA501 as a power amp for bi-amping, TheLoudspeaker-2,_FA501.htm (plate amp no longer available)

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Up-Grade Kits For Vintage Speakers

JBL L100 Century

JBL L112


Tannoy MG15

B&W 802s3, better crossover components and wiring

Should I up-grade my vintage speakers? Read here.


Discontinued as kits from Jantzen Audio, source components locally.



Dali800 renovation, new tweeter and crossover

Chario Academy Sonnet speaker


Find feedback to kits here


Vintage Loudspeakers

Click heading or image to go to vintage intro

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JBL, James B. Lancing

JBL L112 Up-Grade Kit
JBL L100 Century Up-Grade Kit
JBL L100 Recreation, new aperiodic cabinet
Read L100 upgraders' response to kit
JBL LE20 and LE25 tweeters
JBL LE26 tweeters
JBL L26-3way



Part 1: Tannoy 15" MG
Part 2: Tannoy MG15 Upgrade Filter
Part 3: Tannoy MG15 Crossover Problem






Mail exchange with former Wharfedale employee
Wharfedale 1962 brochures
Wharfedale SFB, pics and comments from owners
Wharfedale Super 8 RS/DD
Wharfedale Super 3 tweeters
Wharfedale Super 8/FS-AL & North England M8, only pics


None of the midbass drivers here available, nor any replacements!

PL14WJ-09-08/ScanSpeak R2604/832000, 2-way 11.5 liter bookshelf mini, or 25 liter d'Appolito, can be used for center speaker
C17WH d'Appolito: C17-I, C17-II, C17-III, C17-mk4. C17 drivers very hard to find
C20WH-07-08 + Monacor DT300/waveguide. C20 drivers very hard to find

High Efficiency Speakers and vintage stuff

High Efficiency Speakers, intro and experiments
Supravox full-range experiments in DTQWT cabs
Supravox 215GMF tweaking for better performance

Müll oder gut für ein Schlechtwetterprojekt? Vintage Isophon P25A
Vintage ScanSpeak. W21-3804-P2A and D3804 drivers
German SABA greencones, pics, links and some modelling
1955 Karlson Speaker Brochure
Sonab OA5 mkII speakers, Stig Carlsson's omnidirectional speaker from the Seventies

Spendor BC1
Philips 9710 Part I-II-III
Philips 9710 disassembling
Philips AD-0160-T8, world's worst dome tweeter?
Blackcones, vintage SEAS 21 TV-G and SEAS 9 TV-LG and resonant boxes
Clarion by SEAS, a 1978 classic 3-way from SEAS 25 F-WBX/DD, 11FM (H130) and 1" dome (H107)

SEAS kit 503, the big SEAS 3-way of the Seventies
SEAS KIT brochure
SEAS KIT 303 crossover
Download SEAS brochure (Norwegian) on kits 223, 253, 403, 603 and Disco-47

Goodmans Axiom 150 mkII
Goodmans Axiom 150 mkII + Supravox 215RTF64 + LE26 dipole panel (=OB7 article)
Dali800 renovation, new tweeter and crossover

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Loudspeakers in general/FAQ/tips/ideas, etc.

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Super caps, what are they and why are they so expensive?
Jantzen Audio, Alumen-Z, test
Jantzen Audio, Amber-Z, test
Response to upgrade from standard PP caps to super-caps
Description of capacitor sound found in the web

What it takes to make a crossover, - please read before asking for a crossover for your drivers!!
Choices, How to pick the right diy speaker project. Size matters. Please read before writing!
My measuring equipment, books and articles useful for getting started in loudspeaker building
High-pass filter for power amps
Passive to active? Why not so easy.
Time-alignment of drivers. How to determine dZ
Inverted polarity, what is it?
Find the polarity of your driver
Calculation of box volume and ports. Can we calculate box volume at all?
Vent tuning, calculation of vent length
Tips & Ideas, Glue for crossovers, solder tag strips, flaring plastic vents, damping materials, etc.
Edge-coating of drivers
Edge-coating and linear distortion, prelude to CNO-GRANDE construction
Definition of frequency ranges
Bi-amping, what is it? Some hints and tips
Room-gain, a case study
Measuring inductance of low-DCR coils, like C-coil
Use a Hypex FA251 or FA501 as a power amp for bi-amping
Inverted polarity, what is it? I'm afraid we need to spend a little time here.
Passive to active: Convert a passive design to fully active
Room-gain, a case study
Beaming. What is it?
Cabinet damping, please check this before writing on cabinet damping
Why it's not so easy to make a small mini into a 3-way
The importance of chamfering driver holes. A small study
How flat is flat? Does a flat frequency response matter?
Why my crossover layout may differ from actual schematics. A very common question
Room Acoustics. Thoughts from Speakers' Corner with a few added comments
Electronic crossovers, pros and cons
Check here what diffraction looks like! From the excellent site of Art Ludwig
How female vocals can make your hair turn grey - and can low-order filters do something about it?
Speaker cables and interconnects
Power handling of loudspeaker systems

Large domes, part I. Test of SEAS T35C002, Chario Sonnet, modified Audax TW034, Ciare MT320 and Accuton C30-6-024 domes
Tweaking the Audax TW034XO-P47N dome for better performance
Tweaking SWANS RT2H-A planar tweeter for better performance
Waveguide for ScanSpeak D2904/710003 tweeter
More on waveguides for ScanSpeak tweeters
Eight + one: Can we make a 2-way from and 8" driver + 1" dome tweeter?
Wide Baffles, introduction, Stradivari, how does wide baffles impact sound reproduction
Study on stepped baffles with little impact on tweeter performance
Make your own non-inductive graphite resistors!
Tweeter measurements
My Panasonic TV, better sound on a weekend
Choosing the right point of crossover
What is an acoustic vent, aperiodic tuning, Variovent
Definition of frequency ranges
The importance of wiring crossovers correctly
SS 9500, 9700 and 9900 tweeters, why they are not interchangeable
Shipping speaker drivers
Fountek ribbons
Fountek JP3 ribbon replacement, pdf file.

Links to other sites:
Want to hear what your cabinet panels sound like?

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Ortofon T5000 SUT
Thöress EHT Integrated amplifier. Can you handle the truth?
Test Audio Technica ART1000 cartridge
Testing ScanSpeak D2104/712000 3/4" dome tweeter
Testing new Jantzen Audio AMBER-Z-CAP
Testing SBAcoustics SB29BAC-C000-4 Be dome
Testing EAR Acute Classic CD-player/DAC
Testing new ScanSpeak Ellipticor 21WE/4542T00 midbass driver
Testing BlieSMa T34B-4 Beryllium dome
Testing new T34A-4 34 mm dome tweeter from BlieSMa
Testing ribbon tweeter, Viawave GRT-145W-8.htm
Testing ribbon tweeter, Viawave GRT-145-4
LCR RIAA shoot-out, EAR-912 vs vdh The Grail vs Valab LCR-1
Testing EAR 912 preamplifier with phono-stage
Testing Alumen Z-Caps from Jantzen Audio, a new foil capacitor
Testing Audio-gd pre-amp/headphone amplifier NFB-1AMP
Test ATC SM75-150 midrange dome
Test of ScanSpeak D3004/604010 Be domes
Test of two ScanSpeak ring-radiators, R3004/662000 and R3004/602010
SAC Thailand GlowMaster KT 88 fully balanced power amp
Test of van den Hul The Grail phono stage
Large domes, Test of SEAS T35C002, Chario Sonnet, modified Audax TW034, Ciare MT320 and Accuton C30-6-024 domes
ScanSpeak tweeters, D3004/660000 and D2904/710003, D3004/6640 Beryllium dome and D2908/7140 Beryllium dome 
Test of DiyHiFiSupply EZ line stage
Test of MANGER MSW transducers
Norwegian Wood, review of MAE1, Single Ended Tetrode Amplifier Kit from Norway
Review of vintage Snell A3i loudspeaker
Chario Academy Sonnet speaker
Jungson JA88D-09, 2 x 80 watt class A solid state amp - or at least some of these watts in class A ...
Jungson Duro power amp
Garrard 401/LINN - Thorens TD124 mkII/Jelko shootout!
Test of Lowther EX3

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Main System

Kuzma StabiR turntable, Kuzma 4Point tonearm + Ortofon Anna D cartridge

Yoshino EAR Acute Classic CD-player/DAC

Yoshino EAR-912, pre-amplifier, line-stage/phono stage

2 x Yoshino EAR-861, 64 wpc bridged power amplifiers

van den Hul The Grail phono stage

ScanSpeak Ellipticor-A50-mkII

ScanSpeak Ellipticor-2F8

ScanSpeak Revelator-851

ScanSpeak Ekta-7741

ScanSpeak Illuminator-71


WORKSHOP SYSTEM and stock speakers

Kuzma Stabi R with 4Point9 tonearm + MSL Eminent EX cartridge

Yoshino EAR-868PL Phono/Line Stage Preamplifier

Yoshino EAR-861, 32 wpc power amplifier

ScanSpeak Illuminator-71

Hypex Ucd400, 400 wpc digital power amp (for bi-amping when needed)

Shanling 2.1 CD player


For most larger speakers I use bi-amping, Hypex Ucd400 or Hypex FA501 for the bass and EAR-861 for mid-tweeter. Go to bi-amping here to see what bi-amping looks like.
Bi-amping means you have a line-stage, a pre-amplifier, driving two power amplifiers, which each runs either bass or mid-tweeter. This requires the crossover is separated in bass section and e.g. mid-tweeter section.
Bi-wiring means you have the same amplifier connected to bass and mid-tweeter with separate speaker cables. It also requires the crossover to be separated in sections for bass and mid+tweeter.


LP GEAR, The Vessel B3SS, MM cartridge

My living room rack

High-pass filter for power amps


Speaker cables and interconnects

A few formerly owned components:

QUAD-2812 (I didn't have the space..missed!)
Yoshino EAR-869, integrated/power-amp
SAC GlowMaster KT88 PP, fully balanced power amp
Jungson JA88D-09, 2 x 80 watt class A solid state amp
Maglev turntable, SME 309 GD tonearm, My Sonic Lab Eminent EX cartridge
Shanling CD-T80 CD player
DAC: Musical Fidelity DAC M1a
6N6P line stage with output transformer
2017, renovating two Lenco L75 decks
Lenco L78/Moerch DP6 9" Precision tonearm, vdh Canary cartridge
Lenco L75 + Moerch 12" tonearm, vdh Colibri cartridge
Lenco L75, Jelko 12" tonearm  van den Hul Canary cartridge    van den Hul Colibri cartridge
Project RPM4 turntable, rebuild
Phono stage based on Transcendent RIAA schematics
Jungson Hedo/Duro power amplifier, the power amp section of the Jungson JA88D-09
Einstein The Amp
Garrard 401 turntable/Jelko 750D
300B, 8 wpc SET integrated amplifier
Audio Mirror, Vladimir Bazelkov's 6AS7 PSE, 20 wpc mono blocks, rebuilt to 6C33 tubes
Thorens TD124 mkII/Jelko
Transcendent Grounded Grid line stage
Transcendent Phono Stage
Audio Research SP16L
Copland CTA 505
Numerous LCAudio power amplifiers
DACT line stage
Numerous home-made valve line stage amplifiers
Luxman MQ70 (EL34) power amplifier
Erno Borbely MosFet power amplifiers
Danish High Fidelity magazine preamplifiers, MC, phono and line stages

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Click logos to go to websites

Crossover components found on this website are sponsored by Jantzen Audio.  Jantzen Audio has the most extensive range of baked coils available, supplemented by a wide range of audio grade capacitors. In addition to this a wide selection of components for speaker building.

Complete crossover kits for the shown constructions can be ordered at: For SEAS, ScanSpeak, SBA, Purifi and some AudioTechnology constructions, this can include drivers as well.
I'm particularly grateful to Jantzen Audio for taking the financial risk of launching the JA8008 and JA8008-HMQ drivers. Without their support these drivers would never have been made.

Some of the drivers used in the constructions were sponsored by Jantzen Audio (SEAS drivers), ScanSpeak, AudioTechnology and SBAcoustics.
Thanks to those who made this possible! Without your support only a few constructions would have made these pages.

None of the constructions shown at my website were suggested by any of my sponsors (Except for MUN-17, Ellipticor-1 and Ellipticor-A50) and I'm not financially affiliated with any of my sponsors. For questions regarding the constructions on this site, please contact me at:

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