DIY Loudspeaker Projects
Troels Gravesen, Denmark
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About this
website:
The constructions show here are
divided into sections based on the main driver in
the system. Click green (heading)
to go to intro page or click projects - black
- and go directly. Some projects are available as
pdf files and can be downloaded here.
Please do take a look at
"crossovers" before
writing. If you have specific questions to my
constructions, be sure having read the file
thoroughly before writing. Most questions I
receive are already answered in the files. I do
not have time to guide you through e.g. cabinet
construction in detail. There are numerous
examples on the web on how to make cabinets; use
google.
Again: Please read this
before writing: Crossovers
I case you want advice on what
speakers to build, please read "choices". I do not
engange in this and shall not recommend any
speakers for reasons outlined in the file. And I
mean this seriously: DO NOT ask which speaker to
build.
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. Please write
something in "subject line" that
clearly describes the issue so I can pick deleted
mails having "spam" in subject line,
which happens much too often.
Regarding frd and zrd files for speaker
simulation: I do not provide these files from my
LspCAD library and please do not send your own in
case you have them. I have done a few times and
people sometimes get all sorts of funny results
and I do not have time to discuss how to use the
files correctly. Sorry!
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. 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 also regard any communication between you and
me as personal, so don't post my comments or
anything on dicussion forums, websites, etc.
without my written consent.
contact:
troels.gravesen@stofanet.dk
None
of constructions, illustrations or information
presented here
may be used for commercial purposes without my
written consent.
Copyright © Troels Gravesen
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to on this page:
Speakers'
Corner
- last updated 01
March 2010 -
   
Feel
the audio power of the
best floorstanding speakers online
For sale
New
Monacor drivers for d'Appolito construction, 1600
DKK/210 EUR.
Pair
SEAS CA25FEY, high-efficiency bass drivers, new
in box, 1500 DKK/200 EUR.
Download SEAS data sheet here.
contact:
troels.gravesen@stofanet.dk
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Loudspeaker
Projects:
High-Efficiency
speaker constructions:
Click heading
or image to go to HES speakers introduction.
SEAS:
Click
heading or image to go to SEAS constructions'
overview
Scan-Speak:
Click
heading or image to go to ScanSpeak
constructions' overview.
AudioTechnology
- Peerless - Vifa - Dynaudio
High
Efficiency Speakers:
Click
heading or image to go to HES speakers intro,
part I
High
Efficiency Speakers intro, part I, discussion
High-Efficiency
speakers, part II,
(SEAS
CA21REX, Vifa C20WH, Supravox, etc.),
DTQWT,
95 dB double-tapered-quarter-wave-tube design, my
reference speaker
TQWT,
95 dB tapered-quarter-wave design
Supravox
full-range experiments in DTQWT cabs.
OB7,
Goodmans Axiom 150 mkII + Supravox 215RTF64 +
LE26 dipole panel
OB9,
2009 open baffle construction with JA8008/TW034
and Eminence Deltalite II 2515, 15" bass
driver
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.
Vintage
Loudspeakers
Click
heading or image to go to vintage intro
Mail
exchange with former Wharfedale employee
Wharfedale
1962 brochures
Wharfedale
Super 8 RS/DD
Wharfedale
Super 3 tweeters
Wharfedale
Super 8/FS-AL & North England M8, only pics,
measurements to come.
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
Vintage
ScanSpeak. W21-3804-P2A and D3804 drivers.
Tannoy
15" MG
Tannoy
10" MG
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?
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.
Goodmans
Axiom 150 mkII
Goodmans
Axiom 150 mkII + Supravox 215RTF64 + LE26 dipole
panel (=OB7 article)
Dali800
renovation, new tweeter and crossover
Vintage
Russian extended range drivers, 5GDH4 + super
caps. Preliminary report
Loudspeakers
in general/FAQ/tips/ideas, etc.:
Gear:
Main system:
7119/5687
w.o.t. (with output transformer) line stage
Audio
Mirror, Vladimir Bazelkov's 6AS7 PSE, 20 wpc mono
blocks
Transcendent
Phono Stage, with SILK MC transformers
300B,
8 wpc SET integrated amplifier + cap test
Garrard
401 turntable/LINN ITTOK LVII tonearm,
Garrard
401/LINN - Thorens TD124 mkII/Jelko shootout!
Speakers:
DTQWT
CD player: Shanling CD-T80.
Have changed output coupling caps to
silver/gold PPs and valves to WE396A. Changing
the caps did the most.
Auxiliary equipment
Jungson
JA88D-09, 2 x 80 watt class A solid state amp
Denon
DL103, phono cartridge
Dynavector
DV20X (high output), phono cartridge
Transcendent
Grounded Grid line stage
Thorens
TD124 mkII turntable, Jelko SA 750D tonearm, Dynavector
XX2-mkII cartridge
Restoration
of mistreated SME series II tonearm.
Rotel RB981 power amplifier,
workshop workhorse, Download Service
Manual, 800KB
Not a bad amplifier at all. Input
caps are crap. Insert switch for DC operation -
if pre-amp allows! Currently used with
5687/output-transformer line stage in my
workshop.
Previously owned equipment:
Transcendent
T16OTL power amplifier, pics and comments
Copland CTA505
Audio Research SP16L line stage
LC Audio Millennium power amp
DACT 6 dB line stage
Luxman MQ70 EL34 PP power amp.
An infinite number of home-made amps, speakers,
electronic crossovers, turntables, etc.
This only goes back some 10-15 years. Listing all
previously owned equipment would be impossible.
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Recent
updates:
Go
to top
18-02-2010:
Study
on stepped baffles with little impact on tweeter
performance.
11-01-2010: Siri's
Killer Note; how female vocals can make your hair
turn grey (-
if it wasn't already)
03-01-2010: Some
thoughts on amps for TQWT and DTQWT speakers.
26-12-2009:
New
workshop amplifier: JungSon JA88D-09.
18-12-2009: SP98-09,
new crossover and cabinet for ScanSpeak
18W/8531G00 and D2904/9800 tweeter.
05-12-2009: Christmas
Month Special: Make your own non-inductive
graphite resistors!
01-12-2009: The
importance of chamfering driver holes. A small
study.
21-11-2009: Calculation
of box volume and ports. Can we calculate box
volume at all?
05-11-2009: WWDT,
world's worst dome tweeter, PHILIPS AD-0160-T8.
01-11-2009: Audio
Technology 10C77 sandwich cone bass drivers under
test.
01-11-2009: Update,
Garrard 401/Thorens TD124 shootout.
29-10-2009: Vintage
ScanSpeak. W21-3804-P2A and D3804 drivers.
09-10-2009: Ellam
d'Appolito from ScanSpeak 15W8530G00+Vifa
XT25TG-30-04.
08-10-2009: AT-SW:
2-way compact BR from AT 18H52 midbass and
modified SWANS planar tweeter
19-09-2009: Why
it's not so easy to make a small mini into a
3-way. Based
on numerous mails.
03-08-2009: 5687
line stage finally finished! Or
is it? Will it be a 7119 line stage with grid
battery bias?
27-07-2009: Vintage
Sonab OA5 mkII speakers, the first
omnidirectional speaker on this website.
07-07-2009: Garrard
401/LINN - Thorens TD124 mkII/Jelko shootout!
04-07-2009: STUDIO
101, 13 liter stand-mount speaker from SS
18W/8542-00 + SEAS 27TFFC
14-06-2009: Jensen
1071, big 3-way from SS 26W/8861T00 +
18W/8531-G00 + D2905/9900.
25-05-2009: Vintage
SEAS 3-way from 1978. "Clarion by SEAS,
70120"
15-05-2009: OB9,
2009 open baffle set-up. 15" bass driver and
electronic crossovers!
14-05-2009: Mark21,
2 x SS 21/8554-00 + 15M/4531-K00 + XT25TG, built
by Mark/Denmark.
13-04-2009: Center
speaker from Peerless HDS 831882 + Vifa XT25TG
22-03-2009: Jazzman,
3-way ScanSpeak with 22W/8857T00 + 15W/8530-K00 +
Vifa XT25TG
16-03-2009: Ellam-25,
Ellam XT 2½-way construction, compact
floorstander
20-02-2009: CNO-25,
2½-way CNO. 36 liter floorstander.
15-02-2009: Modification of
my 300B SET amp. Valve expert gives advice, but
is it audible?
12-02-2009: MAYA,
SEAS CA18RNX + T25C003, 24 liter floorstander.
31-01-2009: SEAS
TOK, 24 liter floorstander or bookshelf,
CA18RNX+T29CF002 (!)
29-01-2009: CNO-T25,
CNO construction with T25C003 tweeter
29-01-2009: CNO
mkII, brush-up on a popular floorstander.
25-01-2009: SP44,
SS 18W/8531G00 + Accuton C244-8
+ HIQUPHON OWI
18-01-2009: Peerless
mini, HDS134-PPB (830860) + DX25TG05-04 or
XT25TG30-04
01-01-2009: PL14-d'Appolito
added to PL14-COMPACT version
View
updates 2005-2008
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Index: Builders'
response
Go
to top
03-03-2010: Ekta,built
by Staffan, Sweden.
03-02-2010: DTQWT
built by Mark/Denmark.
27-01-2010: More
response to JBL up-grade kit.
25-01-2010: SEAS
3-Way Classic, built by Slawek/Poland.
31-12-2009: PMS
built by Patricio, Spain.
13-12-2009: DTQWT
built by Peter/Denmark.
29-11-2009: PMS
built by Pierre and Max, France. An impressive
exercize in CNC manufacture.
15-11-2009: SEAS
W12CY003 mini built by Max/Ukraine.
28-10-2009: PMS,
built by Mike Kelly/US.
21-10-2009: Cyclop,
built by Max/Ukraine.
21-10-2009: Cyclop,
built by Laurent/France.
18-10-2009: TJL2W
built by Moshik/Israel.
20-09-2009: 3-Way
Classic built by Pawel/Poland.
08-09-2009: Ekta
Grande built by Wen-Shan, Taiwan.
25-07-2009: DTQWT,
built by Ilpo/Sweden
03-07-2009: Ekta
Grande, built by Martin/Taiwan
17-06-2009: CA18RLY/22TAF-G,
built by Koen/Belgium.
04-06-2009: CNO,
built by Ray/UK
02-05-2009: Ekta
Grande, built by Dennis/Denmark. Comments in
Danish.
18-04-2009: CNO,
built by Tore, Norway.
10-04-2009: PMS
built by Leif/Finland, another great piece of
cabinet work.
08-04-2009: EllamXT
built by Keith/US.
27-03-2009: ATR
built by Sjaak/Holland.
24-03-2009: DTQWT
built by Chris/Greece.
10-03-2009: Response
from people having up-graded their vintage JBL
L100 speakers.
06-03-2009: CSM
builders' response.
01-03-2009: 3W-Classic
built by Richard Kuba/Slovakia; beautiful cabs!
28-02-2009: TQWT
built by Greymyth.
26-01-2009: TJL3W
built by Fabio, Italy
04-01-2009: Poor
Man's Strad built by Kari/Finland. Stunningly
beautiful cabs!
04-01-2009: Ekta,
built by Geoffrey/New Zealand
31-12-2008: SP38/13
and Vifa PL18/XT built by Yavor.
20-12-2008: DTQWT
built by HUH/Thailand
16-12-2008: Ekta
Grande built by Oleg/Russia
08-12-2008: JBL
Recreation, built by Volker/DE
16-11-2008: CNO
built by Kjell/Norway - beautiful maritime cabs!
14-11-2008: 3W-Classic
built by Stephen/US.
10-11-2008: TJL3W
built by Lance/UK
02-11-2008: SP95
built by David, US
25-10-2008: CNO
built by Andrej with review
12-09-2008: Ekta
Grande built by Koen/Belgium (beautiful cabs)
26-08-2008: 3W-Classic
built by JanK/Canada
01-06-2008: SEAS-5INCH,
CA18RLY built by Mats/Sweden (pdf file).
31-05-2008: Acapella
SEas built by Avi/Israel.
05-05-2008: TQWT
built by Liudas/Lithuania.
02-05-2008: TQWT
built by John Eekels/Holland.
11-04-2008: JA8008
project from Lennart/Sweden. A gigantic project.
08-03-2008: TJL2W-Neo3-version,
built by Johnny.
22-02-2008: CNO
built by Kevin.
21-02-2008: Ekta
built by Ken/California.
10-02-2008: My
C20 kit in the hands of Per/Denmark. Correspondence
in Danish only.
05-02-2008: Up-date
on PMS-builders.
04-02-2008: View
TJL3W built by Roman/Russia
11-01-2008: View
PMS built by Albert/Canada.
09-01-2008: W15/OWI,
built by Fritz Reinman. Ever tried bloodwood?
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