DIY Loudspeakers
 
Troels Gravesen, Denmark 

Page Index    Updates    Builders' response    For sale   Speakers' Corner April-14

                 

               


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 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 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 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

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   For sale

Go to sale page

Garrard 401/Jelko/Kokomo thrust plate/silver wire/Eichmann Bullet plugs. 1140 EUR + shipping.

Ellam FLEX 3W for sale. Go to sales page for info. Can be packed (extra cost) and shipped to most EU countries, probably 350 EUR on top of speaker cost.

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Speakers' Corner
- last updated April 2014 -
Launch of SEAS NEXT4 speaker
Recent updates

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11-04-2014: SEAS NEXT4 speaker construction. Four drivers and the best SEAS construction I've ever made.
21-03-2014: Test of SEAS C18EN001 coax driver. Have high expectation from this driver in future constructions.
15-02-2014: Update on Tips & Tricks - and for those who haven't seen this page before.
10-02-2014: Room Acoustics. Thoughts from Speakers' Corner with a few added comments.
01-02-2014: Discovery W18, 2-way ScanSpeak from affordable drivers. Experience four different crossovers and two different front panel options.

25-11-2013: ScanSpeak Micro. 5F/8422T01, the smallest speaker I've ever made
02-11-2013: ATS-4, my most ambitious project so far. The best from AudioTechnology, ScanSpeak and Jantzen Audio
02-11-2013: Test of ScanSpeak mini full range drivers, 5F/8422T01 and 10F/8414G10
21-09-2013: Test of ScanSpeak D2908/714000 Beryllium dome.
14-06-2013: Ellam FLEX 3W, the mini-Jenzen from ScanSpeak 22W/4551T00, 15W/8530K00, D3004/660000 and three other tweeters
30-05-2013: Ellam FLEX, two-way mini from ScanSpeak 15W/8530K00 and four tweeter options.
28-05-2013: TQWT/DTQWT-10/DTQWT-12 T35 options. The SEAS T35C002 dome adapted to the most popular constructions.
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

View all updates

Go to builders' response page


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21-04-2014: OBL-11, built by Steven, Indonesia
15-04-2014: Studio 101, built by Alex, Australia
12-04-2014: Ekta Grande, built by Alberto, Spain
08-04-2014: Jenzen Diamonds, built by Nigel, Australia
24-03-2014: Jensen 1071, built by Ziggy, Poland
19-03-2014: Discovery W18, built by Paul, Canada
18-03-2014: Jenzen Accu, built by Jara, Czech Republic
08-03-2014: Up-date on Ellam FLEX 3W, built by Bertrand, Canada
04-03-2014: CNO, built by Tom
24-02-2014: Illumina 66, built by Giuliano
24-02-2014: Ellam FLEX 3W, built by Bertrand, Canada, stunning front panels!
20-02-2014: ScanSpeak Ellam 98, built by Kevin
17-02-2014: ScanSpeak Illuminator Monitor, built by Manuel
17-02-2014: Ellam XT, built by Andrea, Italy
16-02-2014: DTQWT, built Tonny, Denmark
16-02-2014: TQWT, built Sergio, US
15-02-2014: NOMEX 164, built by John, Australia
11-02-2014: SEAS CA15RLY-22TAF/G, built by Jevgeny, Latvia
29-01-2014: Poor Man's Strad, built by Konstantinos, Greece
19-01-2014: DTQWT mkII, built by Lars, Norway
14-01-2014: PMS, built by Hugues, France
09-01-2014: CNO and other speakers, built by Alexander, Russia

04-01-2014: Zahra, built by Young, Korea
25-12-2013: TQWT, built by Martin, Germany
22-12-2013: ScanSpeak Amish, built by Ball/Thailand
15-12-2013: 3-Way Classic, built by Marshall
06-12-2013: Vifa C17 d'Appolito, built by Greg
29-11-2013: NOMEX164, built by Vladimir
22-11-2013: Illumina 66, built by Wilson/Taiwan
04-11-2013: Scoperta, built by Patrick, Kansas, US
04-11-2013: DTQWT, built by John, Kansas, US
23-10-2013: DTQWT, built by Paul, Australia
22-10-2013: Peerless NOMEX164, built by Anders, Sweden
30-09-2013: Jenzen Accu, built by Björn, Sweden. Stunning cabinet finish!
28-09-2013: Jenzen Accu, built by Keith, Australia
26-09-2013: Jensen 1071, built by Jarek, Poland
26-09-2013: Vifa PL18-XT25, built by Peppe, Italy
17-09-2013: NOMEX164, built by Drew, Canada
16-09-2013: CSM, built by Nick, UK
11-09-2013: NOMEX 164, built by Roman, Germany
11-09-2013: AudioTechnology PRELUDE, built by Raphael, France
02-09-2013: DTQWT, built by Daniel, Denmark
02-09-2013: JBL L100 Upgrade Kit, built by Vidar, Sweden
29-08-2013: Ellam XT variant, built by Rafal
17-08-2013: Compact Studio Monitor, CSM, built by Christian
10-08-2013: Studio 101, built by Braydon
05-07-2013: TQWT, built by Sergey, Ukraine
03-07-2013: SEAS 3-Way Classic, built by Nazar, US
02-07-2013: Jensen 1071, built by Stephen, US
30-06-2013: DTQWT, built by Simon, UK
29-06-2013: DTQWT, built by Moses, Canada
27-06-2013: Ellam d'Appolito, built by Andrea, Italy
24-06-2013: Eekels' Minis, built by Vidar, Sweden
22-06-2013: DTQWT, built by Mason, US
22-06-2013: Jenzen Illuminator, built by Ball, update with final cabinets
21-06-2013: SEAS 3-Way Classic, built Mr. Wang, China
12-06-2013: CNO-25, built by George, NZ
29-05-2013: DTQWT, built by Dave, AU
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, 2½-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

Go to all builders' response

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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

TQWT/DTQWT-10/DTQWT-12 T35 options. The SEAS T35C002 dome adapted to the most popular constructions.

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

 

2½-WAY CONSTRUCTIONS 20-35 LITER

CNO-25, 2½-way CNO, x W18NX001+T29CF002

CA18RNX, 2½-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.

Ellam FLEX 3W, 3-way from 22W/4851T00, 15W8530K00, D3004/660000, R3004/662000, D2604/833000, R2604/833000

 

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

 

2-way stand-mount, max 20 litre

Discovery W18, 2-way ScanSpeak from affordable drivers. Experience four different crossovers and two different front panel options.

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

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

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

Compact Studio Monitor, 18W/8545-K00 + R2604/832000

 

Minis, max 10 litres

Ellam FLEX, two-way mini from ScanSpeak 15W/8530K00 and four tweeter options.

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

 

Other ScanSpeak stuff

ScanSpeak Micro. 5F/8422T01, the smallest speaker I've ever made

Test of ScanSpeak tweeters, D3004/660000 and D2904/710003, D3004/6640 Beryllium dome and D2908/7140 Beryllium dome

Waveguide for ScanSpeak D2904/710003 tweeter

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.

The 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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Other Up-Grade Kits
Dali800 renovation, new tweeter and crossover

Chario Academy Sonnet speaker
AudioTechnology Constructions


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

ATS-4, my most ambitious project so far. The best components available from AudioTechnology, ScanSpeak and Jantzen Audio.

Jenzen ATS. 10C77 bass, special 18H52 mid and ScanSpeak Be 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 2½-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

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 + 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:

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

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.:
Back to Index

What it takes to make a crossover, - please read!!

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

Room Acoustics. Thoughts from Speakers' Corner with a few added comments.

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

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

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

The importance of chamfering driver holes. A small study.

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

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

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?

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

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

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.

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 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 (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:

Current system

van den Hul The Grail phono stage
6N6P line stage with output transformer
SAC GlowMaster KT88 PP, fully balanced power amp
Hypex Ucd400, 200 wpc power amp dedicated for bi-amping
ATS-4 speakers
Lenco L75, Jelko SA750LB, Dynavector XX2 mkII, van den Hul Canary cartridge and van den Hul Colibri cartridge.
Shanling 2.1 CD player
DAC: audio-gd 2.32

 

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.

Hypex Ucd400, 200 wpc power amp dedicated for bi-amping.

Einstein The Amp My pics
Einstein The Amp -
Einstein website
I never thought I'd buy a twenty years old solid state amp, but this one is special. This 60 wpc amp runs the ATS-4 - all of it - without any trouble. The most dynamic and deep bass I've ever heard from a 60 watt solid state. Bought for 800 € on eBay 2013. It may not have the holographic midrange of the GlowMaster, but overall coherence is phenomenal. And it's very much class AB... never say never. Audio Komponenten - Einstein Audio

Friend of me recently bought the amp to find it with bleeding electrolytic caps and burned resistors. No sound at all. Buying old stuff can be gambling, so take care!

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

 

 

SPEAKERS (this changes all the time)

ATS-4

DTQWT mkII, T35 option

Ellam FLEX 3W

QUATTRO

8008 Center

Rogers LS3/5a

 

MUSIC SOURCES

Lenco L75, Jelko SA750LB  
Dynavector XX2 mkII cartridge  
van den Hul Canary cartridge   
van den Hul Colibri cartridge

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

Garrard 401 turntable/Jelko 750D

Shanling CD-T80 CD player

Shanling 2.1 CD player

 

Miscellaneous

Speaker cables and interconnects

 

(a few of -) Formerly owned components:

300B, 8 wpc SET integrated amplifier
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
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 preamplifiers, MC, phono and line stages

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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 and ScanSpeak constructions, this can include drivers as well.
I'm particularly grateful to Jantzen Audio for taking the financial risk of launching the JA8008 driver.

Some of the drivers used in the constructions were sponsored by Jantzen Audio (SEAS drivers), ScanSpeak and AudioTechnology. Thanks to those who made this possible!

None of the constructions shown at my website were suggested by any of my sponsors and I'm not financially affiliated with any of my sponsors.

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

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