DIY Loudspeakers
 Troels Gravesen, Denmark                         Page Index    Recent updates    Builders' response    For sale     Speakers' Corner 13-04-13



Welcome to my website!
Below you will find articles on some of the work done over the last decade. Building speakers has be on and off since high school, but with the availability of PC-based measuring equipment in the Nineties it 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 inefficient speakers to larger constructions providing the dynamics that make reproduced music live and engaging. Below you will find speakers ranging from 4 to 300 litres volume and I hope you will find inspiration for your next DIY project.

If you want to modify the constructions shown here, please read "crossovers" before doing so. In most cases you will need a new crossover and I would need your speaker on my test bench to tell you how.

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 file, and please do not ask about the sonic differences between two speakers. What I hear is unlikely to be what you will hear.

The constructions are divided into sections based on the main driver in the system, e.g. SEAS, ScanSpeak, AudioTechnology. All underlined text is a link, regardless of font properties.

If you have questions regarding your speakers, please include links, photos and crossover schematics if available! There are thousands of speakers in this world and I only know a fraction of them and can't google them all.

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. If you cannot sign your statements, don't write them. 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.

contact: troels.gravesen@hotmail.com

None of the constructions, illustrations or information presented here may be used for commercial purposes without my written consent.
Copyright 2013 © Troels Gravesen

                                INDEX, click headings to go-to on this page

Go to sale page for more info

Dynaudio D5406 pair in perfect working condition, Cosmetically very good. 1200 DKK/160 EUR + shipping

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Speakers' Corner
- last updated 13 April 2013 -
Speakers for sale
Recent updates:

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04-04-2013: Measurements of SEAS T35C002 large dome. Added to Large Tweeter Domes' file.
25-03-2013: Test of van den Hul  The Grail phono stage.
13-03-2013: Why my crossover layout may differ from actual schematics. A very common question.
08-03-2013: Electronic crossovers, pros and cons.
22-02-2013: Up-dated Ekta Grande file. New cabinet drawings, crossover layout, updated parts' list.
10-02-2013: Jenzen ATS, AudioTechnology 10C77/18H52 and ScanSpeak Be dome. The most extensive cabinet work ever.
27-01-2013: Power handling of loudspeaker systems.
26-01-2013: Re-building a ProJect RPM4 turntable. For sale.
26-01-2013: Up-date in Lenko L75 turntable. Two top-plates spray lacquered and friend's L75 renovated with new plinth.

23-11-2012: Update on JUNGSON/HEDO/DURO power amps. Expert looking at schematics and calc. actual class A operation
09-11-2012: DTQWT, 10 or 12 inch. Which should I build?
23-10-2012:
24 bit high-res
18-10-2012:
Jenzen Accu mkII, use Jenzen-D front panel design with minor changes to the tweeter crossover
06-10-2012:
SEAS CURV, mini two-way from SEAS U16/RCY/P and SEAS 29 TFF/W
11-09-2012:
What are the Jenzen speakers? Read here about the rationales behind the speakers
20-08-2012:
Jenzen D mkII. I'm happy having these diamonds running again. New front layout and a few x-over mods
08-08-2012:
Restoring/modernising a Lenco L75 turntable. Lenco L75, Jelko SA750LB, Dynavector XX2 mkII
20-06-2012:
Illumina-66, two-way floorstander from ScanSpeak 18WU/4741T00 and D3004/660000 or R3004/662000
20-05-2012;
Super caps. What are they and why are they so costly?
17-05-2012:
Jenzen Illuminator, 3-way TL design from ScanSpeak W26/8861T00, 18WU/8741-T00 and D3004/660000
09-05-2012:
Jungson DURO power amp added to my stock gear
28-03-2012:
More on waveguides for ScanSpeak tweeters
24-02-2012:
Test of ScanSpeak tweeters, D3004/660000 and D2904/710003, updated with D3004/6640 Beryllium dome
15-02-2012:
Jenzen Diamonds, 3-way TL from AudioTechnology 10C77-25-10-KAP, Accuton C176-6-191E and Jantzen Audio JDT1024 diamond tweeter.
02-02-2012:
ScanSpeak Illuminator. Twenty liter stand-mount from 18WU/8741T00 and D2904/710003 - or make a 30L floorstander
27-01-2012:
Test of DiyHiFiSupply EZ line stage
27-01-2012:
Waveguide for ScanSpeak D2904/710003 tweeter
27-01-2012: Tweak #7 for DTQWT, D2904/710003 with waveguide

30-12-2011: Test of ScanSpeak tweeters, D3004/660000 and D2904/710003
27-12-2011:
Eight plus One, Christmas holiday experiments on a powerful 2-way from 8" bass/1" dome with a simple crossover at 1.5 kHz.
12-12-2011:
My speaker cables and interconnects (by request)
05-12-2011:
Jenzen Accu
30-10-2011:
Test of MANGER MSW transducers.
28-10-2011:
Tweaking SWANS RT2H-A planar tweeter for better performance
25-10-2011:
Updated file on Tannoy MG15 crossover kits
24-10-2011:
JBL L100 Up-Grade Kit now available in four grades.
12-10-2011:
Jenzen SEAS NEXT T25 and -T29. The luxury versions of Jenzen SEAS ER
07-09-2011:
Jenzen SEAS ER and CA constructions. Making high-end sound from budget drivers
26-08-2011:
YAMAHA NS1000M Up-Grade Kit
11-08-2011:
Accuton C30-6-024 tweeter measurements added to large dome tweeter article
24-06-2011:
8008-CENTER, the missing link to a complete surround set, built around JA8008/TW034 drivers
06-04-2011: Review of vintage Snell A3i loudspeaker
23-01-2011:
Re-building my Audio Mirror 6AS7 mono blocks for 6C33 tubes
03-01-2011:
Blackcones, vintage SEAS 21 TV-G and SEAS 9 TV-LG, my Christmas break fun project and final chapter on resonant boxes

View updates before 2012

Go to builders' response page

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21-05-2013: SEAS CURV, built by Michael, US
20-05-2013: YAMAHA NS-1000 Up-Grade Kit by Tim/AU
12-05-2013: Ellam 2.5, built by Trond
24-04-2013: ScanSpeak SP95, built by Andrea, Italy
20-04-2013: SEAS CA18RLY-22TAF-G, built by Anders, Sweden
06-04-2013: SEAS CA18RNX, 2˝-way, built by Philippe, Australia
06-04-2013: SEAS Mini, built by Carl-Fredrik, Sweden
01-04-2013: SEAS Curv, built by Andrew, UK

29-03-2013: TQWT, built by Jean-Michel, France
24-03-2013: Jenzen NEXT, built by CC Li, Hong Kong
13-03-2013: Jenzen SEAS ER, built by Federico, Italy
13-03-2013: DTQWT, built by Anaël, France, beautiful woodwork!
12-03-2013: SEAS CA18RLY+22TAF-G, built by Anders, Sweden
11-03-2013: Vifa PL14 d'Appolito,built by Andrea, Italy
07-03-2013: OBL-11, built by Sergio, US. View stunning design!
06-03-2013: Ekta Grande, built by Gary, Hawaii
23-02-2013: Jenzen NEXT, built by Scott, Texas
23-02-2013: CNO-25, built by Luca, Italy
21-02-2013: SEAS Cyclop, built by Pablo, Spain
17-02-2013: Jenzen NEXT, built by Toni, Bulgaria
13-02-2013: DTQWT-12, built by Stefano, Italy
13-02-2013: CNO mkII, built by Adel, Russia
12-02-2013: Illumina-66, built by Frédéric, France
04-02-2013: DTQWT-12, built by Brian, Tasmania
03-02-2013: Illumina 66, built by Cedric, France
31-01-2013: Up-date on Valentin's DTQWT-12s
25-01-2013: Studio 101, built by Younes
12-01-2013: Eekels' Minis, built by Geir
08-01-2013: ScanSpeak 8542/9700, built by Danny, Belgium
06-01-2013: CNO-25, built by Tom, US

30-12-2012: DTQWT, built by Noël, France
28-12-2012: TQWT, built by Giulio
25-12-2012: TQWT mkII, built by Mark, US
09-12-2012: Zahra, built by Mattias, Sweden
03-12-2012: Peerless Nomex 164, built by Evan
02-12-2012: Response from Illumina 66 builders
25-11-2012: TQWT, built by Ramunas, UK
17-11-2012: DTQWT, built by Maciek, Poland
16-11-2012: Peerless NOMEX164 + Peerless center built around Mark21 design, built by Dana/Florida
08-11-2012: CNO, used for center, built by Michael, US

06-11-2012: DTQWT, built by Daniel, Russia
03-11-2012: Jenzen SEAS ER, built by Peter
02-11-2012: Jenzen SEAS ER, built by Sergio
22-10-2012:
OBL-11, built by Olav, Norway
19-10-2012:
Eekels' Minis, built by Pasquale, Italy
18-10-2012:
DTQWT-12, built by Valentin, US
15-10-2012:
Ellam XT, built by Nick
27-09-2012:
SEAS W15CY001 + Hiquphon OW1, built by Joffrey, NL
27-09-2012:
Ellam XT, built by Robert/UK. Probably the best Ellams ever built
21-09-2012:
ScanSpeak SP95-Ellam-XT, built by Mark Dawson, AU
16-09-2012:
QUATTRO, built by Juergen
16-09-2012:
ScanSpeak 18W/8542 + 9700, built by Will, Seattle
03-09-2012:
SEAS CA18RLY-22TAF/G, built by Silvio, France
29-08-2012:
SEAS 2˝-way CA18RNX/27TDC, built by Jostein, Norway
28-08-2012:
TJL3W, built by John
20-08-2012:
Ekta Grande, built by Igor
30-07-2012:
W15LY-22TAF, built by Tom, US
15-07-2012:
Jenzen Illuminator, built by Ball
15-07-2012:
Ellam 25, built by Steven  
15-07-2012:
3-Way Classic, built by Egor
01-07-2012:
Eekels' Minis, built by Mats, Finland
26-06-2012:
Jenzen ER, built by Vuk, New Zealand
18-06-2012:
Peerless 830860 + XT25TG, built by Orazio, Silcily, Italy. Link to his website
06-06-2012:
CNO mkII, built Young, South Korea
06-06-2012:
ScanSpeak W1500/97 built by Peter, The Netherlands
30-05-2012:
CNO-T25, built by Ladislav, Slovakia
28-05-2012:
DTQWT, built by Valery, Russia
25-05-2012:
QUATTRO-transmission line, built by Niels, Denmark
23-05-2012:
Acapella SE, built by Mar, China
17-05-2012:
SP44, built by Torsten, Germany.
13-05-2012:
Large 3-way built by John, US. Based on PHL 5011, JA8008 and SEAS T35
13-05-2012:
TQWT, built by Daniel, Denmark
06-05-2012:
Peerless 830860, built by Tomas, Spain
03-05-2012:
Ekta, built by Alan/UK
22-04-2012:
DTQWT, built by Nicola, Italy
15-04-2012:
CNO-25, built by James. Stunning cabinet work!
14-04-2012:
Ekta, built by NNN, Italy  
13-04-2012:
3-Way Classic, built by Victor, Ukraine
10-04-2012:
Ekta Grande, built by Dean, US
04-04-2012:
Ellam XT, built by Omar, Mexico
19-03-2012:
Response from Wendy/US on JBL Up-Grade-Kit
15-03-2012:
Totally Stoned 3-Way Classic, built by Federico, Italy
28-02-2012:
Ellam-XT, built by Girmantas, Lithuania
28-02-2012:
CNO-25, built by Ryno, South Africa
21-02-2012:
CNO-25, built by Mehmet.
19-02-2012:
Jenzen SEAS ER, built by Gerrit/NL
08-02-2012:
SEAS W15LY001-22TAF/G, built by Daniel, Russia
25-01-2012:
Ellam-98, built by Tom, Australia
24-01-2012:
Jensen 1071, built by Yetkin, Turkey
20-01-2012:
QUATTRO, built by Ben, US
16-01-2012:
TQWT, built by Steve, UK
09-01-2012:
Ekta Grande built by Tim, Australia
08-01-2012:
OBL-11, built by Carl/UK
08-01-2012:
Ekta Grande, built by Petr, Czech Republic
04-01-2012:
CS Monitor, built by Chris
03-01-2012:
NOMEX 164, built by Ed
02-01-2012:
SEAS 2˝-way CA18RNX, built by Kimon, AU

Go to builders' response before 2012

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HES, High-Efficiency Speaker Constructions

Click heading to go to overview of HES constructions. Click image to go to HES speakers introduction.

Read feedback from HES builders here: http://www.troelsgravesen.dk/Builder's_response.htm

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

DTQWT mkII-12, 12 inch version of DTQWT mkII, JA8008+TW034/waveguide + 2 x Eminence Deltalite II 2512

8008-CENTER, for the complete 8008 surround set, built around JA8008/TW034 drivers.

Tweaking the DTQWT, incl. intro to TQWT-mkII and DTQWT-mkII

QUATTRO, 2-way monitor/standmount from JA8008/TW034wg drivers
Not exactly high-efficiency (90 dB) but belongs to the family of TQWT/DTQWT, OB-9 and OBL-11

OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB. JA8008/TW034 and Eminence Deltalite II 2515, fully passive crossover.

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

DTQWT experiments, JBL LE26/waveguide + Goodmans Axiom 150 mkII, Supravox 215RTF

Amps for TQWT and DTQWT, some general thoughts on suitable amplifiers

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

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Accuton Constructions
Jenzen Accu, Accuton C173-6-191E + Accuton C30-6-024 + Audio Technology 10C77-25-10-KAP

Jenzen D mkII, Accuton C173-6-191E + Jantzen JDT-1024 Diamond Tweeter + AudioTechnology 10C77-25-10-KAP
(I consider the Accuton the main driver here)

SEAS Constructions

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

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3-WAY CONSTRUCTIONS 50+ LITER

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

Jenzen SEAS ER and CA constructions. Making high-end sound from budget drivers.

Cyclop, W26FX002+M15CH002+T29CF002

 

3-WAY CONSTRUCTIONS 30-50 LITER

Acapella NEXT, W22NY001+W18NX001+T29CF001

Acapella SEas, W22EX001+W18EX001+T25C003

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)

Poor Man's Strad, CA22RNX+MCA15RCY+T27TFFC

Poor Man's Strad-EXCEL, W22EX001+W15CY001+27TFFC

3W-Classic, CA22RNX+MCA12RC+27TFFC

TJL3W, W18E001+W12CY001+HIQUPHON OWI download TJL3W, large graphics, zip file

TJL3W, W18E001+W12CY001+Fountek JP3

 

2˝-WAY CONSTRUCTIONS 20-35 LITER

CNO-25, 2˝-way CNO, x W18NX001+T29CF002

CA18RNX, 2˝-way floorstander, 2 x CA18RNX + 27TDC

 

2-WAY CONSTRUCTIONS 15-30 LITER

CNO-mkII, W18NX001+T29CF002

CNO-T25, W18NX001+T25C003

MAYA, CA18RNX+T25C003

SEAS TOK (tweeter overkill), CA18RNX+T29CF002

CA18RLY/22TAF-G COMPACT

TJL2W, W18E001 + Fountek JP3

 

MINIS, 4-8 LITER

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

Scoperta, mini TLs, W15LY001+Peerless HDS

SEAS 5INCH minis, CA15RLY, W15CY001, W15LY001, 22 TAF/G

Eekels' minis, W12CY003+22TAF/G

W15CY001 + Hiquphon OWI

W15CY001 + NeoCD3

 

DISCONTINUED

T14RCY+SS/8513 or Hiquphon OWI, T14RCY discontinued

SEAS W17EX001/SS-8513

W11XT, W11CY001

 

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Scan-Speak Constructions

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

3-way constructions, 50+ litres:

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

Ekta Grande, 18W/8531-G00 + 12M/4631-00 + R2904/7000 or R2604/832000

Jensen 1071, 3-way, 26W/8861T00 + 18W/8531-G00 + D2905/9900.

Jazzman, 3-way from W22/8857T00 + 15W/8530-K00 + R2604/832000

 

3-way floorstanders max. 35 litre

Ekta, 18W/8531-G00 + 12M/4631-00 + R2904/7000 or R2604/832000

SP44, 3-way, 18W/8530-G00 + Accuton C44 + Hiquphon OWI

SP38/13, 18W/8531-G00 + D3806/8200 + D2010/8513

 

2-way floorstanders, max 35 litre

Illumina-66, two-way floorstander from ScanSpeak 18WU/4741T00 and D3004/660000 or R3004/662000

SP95, 18W/8531-G00 + D2905/9500

Amish 45/95, 18W/8545-00 (-K00) + SS D2905/9500

Amish revisited, 18W/8545-00__18W/8545-K00__D2905/9500__D2905/9700

 

2-way stand-mount, max 20 litre

ScanSpeak Illuminator. 18WU/8741T00 and D2904/710003

STUDIO 101, 18W/8542-00 and SEAS 27TFFC tweeter

18W/8542-00 +9700/9500, 18W/8542-00 + D2905/9500 or D2905/9700

Ellam Dappo, d'Appolito construction from 15W/8530-K00 + R2604/8320000

CSM-Compact Studio Monitors, read intro, 18W/8545-00 (-K00) + R2604/832000

CS-Monitor, 18W/8545-00 + R2604/832000

CS-Monitor 18W/8545-K00 + R2604/832000

 

Minis, max 10 litres

Ellam XT25, Compact 2-way, 15W/8530-K00 + R2604/832000

Ellam-9800, Compact 2-way, 15W/8530-K00 + SS D2904/9800

W1500/97, Compact 2-way, 15W/8530-K00 + SS D2905/9700

W1501/95, Compact 2-way, 15W/8530-K01 + SS D2905/9500

 

Discontinued

Zahra, 2 x 18W/8543-00 + 13M/8636-00 + D2904/9800, bass and mid drivers no longer available and no obvious substitutes. Bass drivers can be substituted by 18W/8545-K00 if you can find 13M drivers.

Mark21, 3-way, 21W/8554+15M/4531-K00+R2604/832000, bass drivers no longer available. One builder reported good results with Peerless 830869 for bass. I very much think this driver should work given the 90 dB sensitivity.

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Jenzen speakers

Click image or heading to go to Jenzen website explaining the basic ideas behind the constructions.

What are the Jenzen speakers? Read here about the rationales behind the speakers. 

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

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

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

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, CA18RNY and T25C003/T25CF001

 

Also check out how a range of 6" drivers perform on the Jenzen front panel.

Up-Grade Kits for Vintage Speakers
JBL L100 Century     Tannoy MG15     YAMAHA NS1000M

Find feedback to kits here.

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AudioTechnology Constructions

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

Jenzen ATS, the biggest Audio Technology speaker yet. 10C77 bass, 18H52 mid and Scanspeak beryllium dome.

PRELUDE, ambitious 3-way from AudioTechnology 10C77 bass and 15H52 mid + ScanSpeak 9900 tweeter

AT-SW, 2-way compact vented standmount from AT 18H52 midbass and SWANS planar tweeter

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

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Peerless Constructions

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

NOMEX 164, new 2˝-way Peerless, Peerless HDS 830875 + ScanSpeak D2608/9130 drivers

Peerless HDS-PPB (830860) + DX25TG05-04 or XT25TG-30-04 or R2604/832000

Peerless/Vifa Center, HDS 831882 + XT25TG30-04, 831882 drivers very hard to find

2˝-way HDS164 + Vifa XT25TG, HDS164, 850438, discontinued

HDS134 + DX25TG-05-04, HDS134, 850488, discontinued

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Vifa Constructions

Click heading or image to go to constructions' overview.

PL14WJ-09-08 + XT25TG-30-04 or R2604/832000, 2-way 11.5 liter bookshelf mini, or 25 liter d'Appolito

PL18WO-09-08+XT25TG-30-04 or R2604/832000, floorstander, 24 liter

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

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HES, High Efficiency Speakers:

Click heading or image to go to HES speakers intro, part I

High Efficiency Speakers, intro and experiments

Supravox full-range experiments in DTQWT cabs

Supravox 215GMF tweaking for better performance

Vifa C17WH d'Appolito: C17-mk1, C17-mk2, C17-mk3, C17-mk4, C17 drivers discontinued and very hard to find

C20WH-07-08 + Monacor DT300/waveguide. C20 drivers discontinued and very hard to find

Monacor SP200X + Fountek JP3 ribbon

Fostex FE126E + Fountek NeoCD3

Test of Lowther EX3

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Open baffle constructions

OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB. JA8008/TW034 and Eminence Deltalite II 2515, fully passive crossover.

OB9, 2009 open baffle construction with JA8008/TW034 and Eminence Deltalite II 2515, 15" bass driver

OB7, Goodmans Axiom 150 mkII + Supravox 215RTF64 + LE26 dipole panel

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Vintage Loudspeakers

Click heading or image to go to vintage intro

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

TANNOY
Part 1: Tannoy 15" MG
Part 2:
Tannoy MG15 Upgrade Filter
Part 3:
Tannoy MG15 Crossover Problem
Tannoy 10" MG

YAMAHA
YAMAHA NS1000M UP-GRADE KIT

WHARFEDALE
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

 

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, my Christmas break fun project and final chapter on 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 303, download
SEAS KIT brochure, download 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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What it takes to make a crossover, - please read!!

Choices, How to pick the right diy speaker project. Size matters!

My measuring equipment, books and articles useful for getting started in loudspeaker building

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?

Super caps, what are they and why are they so expensive?

Why my crossover layout may differ from actual schematics. A very common question.

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

Vent tuning, calculation of vent length

Calculation of box volume and ports. Can we calculate box volume at all?

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!

Tips & Ideas, Glue for crossovers, solder tag strips, flaring plastic vents, damping materials, etc.

Cabinet damping, Please check this before writing on cabinet damping.

Tweeter measurements

Find the polarity of your driver

Tweeter distortion test

Coils for beginners.

Placement of coils in crossovers

Choosing the right point of crossover

What is an acoustic vent

Definition of frequency ranges

The importance of wiring crossovers correctly

SS 9500, 9700 and 9900 tweeters, why they are not interchangeable

Why it's not so easy to make a small mini into a 3-way.

Shipping drivers

Fountek ribbons

Fountek JP3 ribbon replacement, pdf file.

The importance of chamfering driver holes. A small study.

Links to other sites:

Good article on series vs. parallel crossovers.

Want to hear what your cabinet panels sound like?

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Reviews

SAC Thailand GlowMaster KT 88 fully balanced power amp

Test of van den Hul The Grail phono stage

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 (partly) class A solid state amp

Jungson Duro power amp

Garrard 401/LINN - Thorens TD124 mkII/Jelko shootout!

 Test of Lowther EX3

 

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My System:

AMPLIFIERS

van den Hul The Grail phono stage

Phono stage based on Transcendent RIAA schematics

6N6P line stage with output transformer

SAC GlowMaster KT88 PP, fully balanced power amp. Go to SAC, Thailand and GlowMaster KT88 page.

Audio Mirror 6C33 mono blocks

Jungson JA88D-09, 2 x 80 watt class A solid state amp - or at least some of these watts in class A...

Jungson Hedo/Duro power amplifier, the power amp section of the Jungson JA88d-09

300B, 8 wpc SET integrated amplifier

 

CURRENT SPEAKERS (this changes all the time)

DTQWT mkII

Jenzen D mkII

Jenzen ATS

QUATTRO

8008 Center

Rogers LS3/5a and SEAS CURV

 

MUSIC SOURCE

24 bit high-res downloads and DAC: audio-gd 2.32 (only pics)

Lenco L75, Jelko SA750LB, Dynavector XX2 mkII

Garrard 401 turntable/Jelko 750

Dynavector XX2 mkII cartridge (link to Dynavector)

Shanling CD-T80 CD player

Shanling 2.1 CD player

 

Miscellaneous

Speaker cables and interconnects

 

Formerly owned components (within the last few years):

Audio Mirror, Vladimir Bazelkov's 6AS7 PSE, 20 wpc mono blocks, rebuilt to 6C33 tubes
Thorens TD124 mkII/LINN ITTOK
Transcendent Grounded Grid line stage
Transcendent Phono Stage
Audio Research SP16L
Copland CTA 505

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Jantzen Audio, Denmark

Crossover components found on this website are sponsored by Jantzen Audio, Denmark
Jantzen Audio has the most extensive range of baked coils available, supplemented by a wide range of audio grade capacitors. Complete crossover kits for the shown constructions can be ordered at:
contact@jantzen-audio.com. For SEAS constructions, this can include drivers as well.

For questions regarding the constructions on this site, please contact me at: troels.gravesen@hotmail.com