Updates 2005-2010

18-12-2010: OBL-11, Open Baffle Loudspeaker. My homage to Gilbert A. Briggs' SFB.
07-11-2010: Final chapter on vintage German greencones
07-11-2010: Building an all Russian tube phono stage based on Transcendent schematics
16-10-2010: Russian 6N6P tubes for my WOT linestage
26-09-2010: Tannoy Monitor Gold MG15 again. Articles on Upgrade Crossover, The MG15 Problem and Updated 2005 article.
18-09-2010: Up-date on "Amps for DTQWT" file. FAQs on bi-amping plus/minus electronic crossovers
28-08-2010: Tweaking the DTQWT, incl. intro to TQWT-mkII and DTQWT-mkII
16-08-2010: Modifying Audax TW034XO-P47N dome
11-08-2010: QUATTRO, 2-way from JA8008/TW034 IN 40 liter vented standmount
18-07-2010: Large tweeter domes, part I. Chario Sonnet dome, Audax TW034, Ciare MT320, Ciare PT383
01-06-2010: Test of Chario Academy Sonnet speaker from a diy'ers perspective
11-05-2010: PRELUDE, 3-way from AudioTechnology 10C77 bass and 15H52 mid + ScanSpeak 9900 tweeter
24-04-2010: 2½-way floorstander from SEAS CA18RNX + SEAS 27TDC
24-04-2010: Vintage, German SABA greencones, pics, links and some modelling
06-04-2010: 2½-way floorstander from Peerless NOMEX 164 (830875) and ScanSpeak D2608/9130
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: 10C77 Audio Technology 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.

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: 10C77 Audio Technology 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

30-12-2008: SEAS CA18RLY + 22TAF-G COMPACT 16 liter monitor (or 24 liter floorstander)
28-12-2008: How to choose the right first-time diy speaker project. Some general advice.
27-12-2008: Vifa PL14WJ09-08 + XT25TG30-04, 11.5 liter mini
22-12-2008: Supravox full-range experiments in DTQWT cabs.
08-12-2008: Response on JBL L100 Century Upgrade Kit
21-11-2008: More 10" bass drivers tested for DTQWT.
10-11-2008: Vintage 16 ohms, 12" bass drivers suitable for DTQWT
22-10-2008: The Cyclop; big 10+5+1 inch 3-way floorstander from SEAS Nextel drivers.
30-09-2008: 300B SET integrated amplifier project; comparing coupling caps.
15-09-2008: Mail exchange with former Wharfedale employee on Super 8/RS/DD and other things.
23-08-2008: DTQWT - the best - and biggest - speaker I've ever made.
19-07-2008: Compact Studio Monitor, ScanSpeak 18W/8545-00+Vifa XT25TG-30-04
19-07-2008: Compact Studio Monitor, ScanSpeak 18W/8545-K00+Vifa XT25TG-30-04
19-07-2008: Compact Studio Monitor, ScanSpeak 18W/8545-nn+ XT25TG-30-04, intro
22-06-2008: Wharfedale 1962 brochures, thanks to Spiros Agathagelidis/Sweden.
14-06-2008: Scoperta, mini TL with SEAS W15LY001 + Peerless HDS tweeter
12-06-2008: SP38/13 as HTML file.
07-06-2008: Test of Lowther EX3.
30-04-2008: Minor up-date on cabinet damping.
27-04-2008: Renovation of Dali 800 speakers.
24-03-2008: Vintage JBL L100 recreation, new aperiodic cabinet.
01-03-2008: ATR25: 2½-way TL from AudioTechnology and Raidho drivers, true high-end.
10-02-2008: Tips on tweeter measurements, microphone set-up, etc.
16-01-2008: Update on placement of coils in crossovers. Impact on inductivity from aluminium.

24-12-2007: Acapella NEXT, the best Acapella? SEAS W22NY001 + W18NX001 + T29CF001
11-12-2007: Three mini-monitors from SEAS W15CY001, W15LY001 and CA15RLY.
10-12-2007: Cabinet damping, preliminary report.
10-12-2007: Shipping drivers (I'm fed up with poorly packed drivers!)
06-11-2007: JA8008/TW034, high-efficiency 2-way in TQWT design.
06-11-2007: High-End Kit for Beginners.
06-11-2007: Three speaker kits for Jantzen Audio, 2-ways and d'Appolito.
05-10-2007: Eekels minis, replacement for the W11XT. SEAS W12CY003 Nextel midbass and SEAS 22TAF/G tweeter.
30-09-2007: Ekta-Grande: Jesper has been working again and the Ekta has grown....
30-07-2007: Two summer '07 fun projects: Up-date with some fullrange experiments and a new crossover for the OB7.
01-08-2007: Vintage JBL LE20 and LE25 tweeters, how good are they?
30-07-2007: Two summer '07 fun projects: MAE1 single ended tetrode amp and high-efficiency 3-way dipole, my SFB substitute.
27-07-2007: Vintage JBL LE26 tweeters. Suitable for high-efficiency systems. How to make a waveguide for LE26.
13-05-2007: Revive your JBL L100 Century loudspeakers with a new crossover kit from Jantzen Audio.
12-05-2007: Amish up-date, crossovers for SS 18W/8545-00, 18W/8545-K00, D2905/9500 and D2905/9700, any combination.
24-03-2007: CNO, SEAS W18NX001 + T29CF002/T29CF001, two-way high-end floorstander in 24 litre cabs.
20-03-2007: Why ScanSpeak 9500 and 9700 tweeters aren't the same.
16-03-2007: Coils for beginners. How to choose the right coils for your project.
18-02-2007: Tweeter distortion test. By request some distortion tests and comments on ribbon tweeters.
18-02-2007: New HES-intro page. This page about high-efficiency speakers needed an update.
15-01-2007: Vintage drivers, the Wharfedale Super 3 tweeters.
12-01-2007: Vintage drivers, the Wharfedale Super 8 RS/DD, how good are they?
11-01-2007: Tweaking Supravox 215GMF. Fountek NeoPro5i and JBL LE26 tweeter with waveguide.
11-01-2007: Vintage drivers, the Goodmans Axiom 150 mkII, restoration and evaluation for coming projects.
11-01-2007: 24 liter floorstander from ScanSpeak 18W/8542-00 + D2905/9700 or 9500.
01-01-2007: High-efficiency mini, Fostex FE126E + Fountek NeoCD3.

27-09-2006: HES-II update. The Vifa C20 option.
23-09-2006: C17-III-revised. Thanks to Åke in Sweden, a few changes has been made to improve tweeter performance.
10-09-2006: C17-III built by Aake, Sweden.
04-09-2006: HES-II. Chapter II on High Efficiency Speakers. A 55 litres two-way with 93-94 dB sensitivity is presented.
08-08-2006: Vifa C17-II. Finally! Simplicity is sometimes the most difficult thing.
18-06-2006: Poor Man's Strad/EXCEL, the EXCEL version of PMS.
15-05-2006: Poor Man's Strad. A wide baffled speaker with a 91 dB sensitivity. SEAS CA22RNX + MCA15RCY + 27TFFC.
25-04-2006: Images and comments on SP38 and Ellam, built by Emil, Macedonia.
23-04-2006: SEAS W15CY001 + HIQUPHON OWI mini-monitor.
12-04-2006: SEAS Kit 503, vintage HiFi speaker kit. How do these 25 years old speakers perform compared to modern speakers?
08-04-2006: Vifa C17-I, 95 dB/2.8 V d'Appolito from Vifa drivers - if you can find them.
31-03-2006: Philips vintage 9710, Third Chapter - and the last one, I promise!
27-03-2006: Ellam d'Appolito, low impedance, high sensitivity. Try it and report back.
20-03-2006: TJL floorstander. Two new tweeter options, the Fountek NeoCD3 and the SEAS T25C001.
18-03-2006: Ellam, monitor, ScanSpeak 15W/8530-K00 + D2904/9800 tweeter.
18-03-2006: Philips 9710 fullrange driver; what you can do and possibly should not do.
18-03-2006: Philips 9710, 9710 + NeoCD3 ribbon tweeter.
13-03-2006: 3WClassic, a 3-way, 90 dB/2.8V classic speaker made from SEAS CA22RNX + MCA12RC + 27TFFC. Easy crossover.
09-03-2006: The TJL2W made my Henrik in Norway.
08-03-2006: Monacor SP200X + Fountek NeoCD3, an easy 90dB/2.8V, 2-way for valve amps and possibly fullrange fans.
05-03-2006: Check SP93 made by Graeme. Very nice work.
05-03-2006: Pictures from the workshop, March 2006 projects.
03-03-2006: W15-NeoCD3, monitor from SEAS W15CY001 + Fountek NeoCD3
28-02-2006: Philips 9710, the Peerless option
21-02-2006: TJL3W available as pdf file. Download from here.
28-01-2006: Acapella SEas, not an upgrade but an alternative tweeter; however, changes the sound radically.
20-01-2006: The TJL3W, 24 litres floorstander, SEAS W18E001 + SEAS W12CY001 + HIQUPHON OWI
08-01-2006: Restoring the JBL L26 Decade. Part I. Refoaming of bass drivers and a new 4th order crossover.
01-01-2006: The importance of wiring a crossover correctly. Read mail from Acapella builder.

11-12-2005: SEAS W15CY001+HIQUPHON OWI, mini-monitor, build by Andy, US.
09-12-2005: Scan-Speak 18W/8531G00+12M/4631G00+D2904/7000. New 3-way construction, the Ekta.
24-11-2005: Scan-Speak 18W/8543-00 + 13M/8636-00 + D2904/9800. New 3½-way construction, the Zahra.
24-11-2005: Design Criteria. How do we choose the right points of crossover?
15-10-2005: Tannoy MG IIILZ. More crossover work.
28-09-2005: Vintage BC1, Martin Colloms has the explanation on the HF1300 tweeter.
28-09-2005: SEAS T14RCY-P/H + ScanSpeak D2010/8513.
23-09-2005: Tannoy MG IIILZ, read here. Crossover version 3 running. And tweeter phase problem solved.
21-09-2005: Peerless HDS164 + Vifa XT25TG, diy-service for one of my friends produced this 2½-way construction.
27-08-2005: Vintage hifi, is it worthwhile? Read about JBL drivers, Spendor BC1, LS35A, Philips 9710 and more.
27-07-2005: Acapella WB, wide baffle experiments. Intro with links below.
17-07-2005: High-Efficiency-Speakers. The never ending search; some initial thinking here.
16-07-2005: Tannoy Monitor Gold, 15" aural nirvana? Lots of photos, 900 KB.
29-05-2005: Acapella SE, build by Mark in California.
04-05-2005: W1500/97, monitor: 10.5 litre vented enclosure. ScanSpeak 15W/8530K00 + D2905/9700.
22-05-2005: W1501/95, monitor: 10.5 litre, closed/(Vario-)vented: ScanSpeak 15W/8530K01 + D2905/9500.
10-05-2005: SP38/13 Crossover and Construction Pictures.
15-03-2005: Modified 2.5 Clone (Danish) Hans Buhl Houmøllers' construction of the "2.95".

Builder's Response Update 2008-2010

23-12-2010: DTQWT, built by Kim/Denmark
20-12-2010: Ekta Grande, built by David/UK
14-12-2010: DTQWT built by Craig/Australia
14-12-2010: DTQWT built by Albert, Canada (update response)
14-12-2010: Peerless NOMEX 164, built by Grayden
10-12-2010: PMS, built by Max, Ukraine
29-11-2010: DTQWT, built by Nikolay, Lithuania
28-11-2010: QUATTRO, built by James/US
28-11-2010: SEAS 5-INCH, SEAS W15CY001/22TAF-G, built by Carmelo and Vincenzo, Sicily
25-11-2010: SEAS 3-Way Classic, built by Jonatan
01-11-2010: Ekta Grande, built by Enrique, Spain
01-11-2010: DTQWT, built by Daniel, Bulgaria
01-11-2010: CNO25, built by Rafal, Poland
31-10-2010: NOMEX164 built by Immanuel, Denmark
21-10-2010: CNO25, built by Jon, Norway
20-10-2010: Ekta Grande, built by Jiri, Czech Republic
06-10-2010: Pics from a Japanese TQWT project, beautiful cabs
05-10-2010: DTQWT built by Diego/Italy
02-10-2010: SEAS CA18RNX/27TFFC, 2½-way, built by Leszek
25-09-2010: SP44, built Rawin/Thailand. Beautiful woodwork!
24-09-2010: Jensen inspired construction made ny Goran. This would be a "Jensen TL 871"
20-09-2010: DTQWT-12, built by Ferraioli Pantaleone/Italy. Yes, a 12-inch, 1.5 meter version of the DTQWT
15-09-2010: SEAS W15CY001+HIQUPHON OWI, built by Remco/The Netherlands
12-09-2010: DTQWT, built by Philippe/Trinidad
12-09-2010: PMS, built by Torben/Denmark
11-09-2010: A Tannoy MG10 story from Jesper/Denmark, in Danish
02-09-2010: PMS built by Ferran, Spain
28-08-2010: DTQWT builders' response, no pics
05-08-2010: Jazzman, built by Craig, Australia
10-07-2010: Response from builders of Vifa constructions
29-06-2010: SEAS 3-Way Classic, built by Max/Ukraine
05-06-2010: Ekta, built by Ball/Thailand
17-04-2010: CNO25 built by Daniel
09-04-2010: New Cyclop cabs by Max/Ukraine and SEAS CA18RLY/22TAF-G floorstander
08-04-2010: SP38 built by Roberto/Italy.
08-04-2010: Jazzman buil by Roman/Ukraine
19-03-2010: PMS, built by Yaniv, Israel
16-03-2010: Update on Lennart's big speaker system built around the JA8008 driver
12-03-2010: PMS, built by Manolis, Greece
11-03-2010: 3W-Classic, built by Björn/Sweden
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/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?