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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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Beyma-12XA30Nd-Speaker.jpg
Beyma-12XA30Nd-Speaker.jpgBeyma 12XA30Nd Speaker2272 viewsThese are the most expensive speakers I have made. Drivers are Beyma 12” with a titanium\polyester concentric 2” dome – 12XA30Nd. Efficiency is 98db\1W\1M for the woofer section and 105db for the tweeter. The drivers can handle 700W! Box is 33ltr and heavily braced with 4” rear port. Finish is heavily stippled and applied with a roller. Xover is at 2KHz. Bass is not super low and requires a subwoofer for better bass. Speakers work extremely well with my 0.5W 1920s tubed amp. See the forum thread Beyma, a Spanish coaxial driver for more information.

Mark Houston – retro-thermionic
12inch-60L-DIY-Subwoofer.jpg
12inch-60L-DIY-Subwoofer.jpg12-inch 60L Subwoofer2449 viewsThese 60ltr sub-woofers were built to complement my 2-way speakers "VoXDeuX". The drivers are 12" polycones with a free air resonance of 25 Hz. In the box they go down to 31 Hz where they are very active. The drivers are very efficient and are being powered by a compact 50W Class-D amplifier. A stereo feed is taken from the preamp and passed through an electronic filter. The filter has a -3 dB point of 52 Hz and but employs only a -12 dB slope. The internals of the box comprise of six vertical braces. Bitumanised heavy Aluminum foil covers most surfaces. Pockets and chambers are formed at the rear by the bracing which carries additional dampening. These are then covered by a single layer of damping.

Mark Houston – retro-thermionic
DIY-Two-Way-Speaker-VoXDeuX.jpg
DIY-Two-Way-Speaker-VoXDeuX.jpg2468 viewsUsing inexpensive components from the local electronics shop I constructed these small bookshelf two-way speakers. They comprise a 5” paper cone mid-woofer and dampened silk done tweeter. On the sides and back is wide internal vertical bracing and bitumanised heavy aluminum foil. This forms bass chambers within the box to control rear reflection. The passive crossover sits external to the speakers and is a Linkwitz-Riley 2nd order with a crossover point set at 3 kHz. The boxes and crossovers are bi-wired using Cat5 cable from the amp to driver. They sound excellent for an AU$350 build.

For more info, see the Simple and Cheap Two Way Speakers thread in the forum.

Mark Houston – retro-thermionic
Fostex-FE206En-Double-Bass-Reflex-Speakers.jpg
Fostex-FE206En-Double-Bass-Reflex-Speakers.jpgFostex FE206En Double Bass-Reflex Speakers3686 viewsThe finish is satin black stipple and the grills are held in place with four rare earth button magnets. Easy to pop on and off. The stipple effect was produced with a roller going over the fresh paint a number of times as it dried. The drivers huge magnets have bitumanised aluminum foil dampening attached and the internal wiring is two stands of lightly twisted wire wrap wire to each binding post. The top chamber is lined (but not stuffed) with Dacron but the bottom chamber is empty. There is no crossover in these fullrange speakers. Efficiency is 96dB at 8ohms impedance so they work well with flea power tube amps. Sitting higher than the tweeter (wizzer cone) the sound is quite natural with just a touch of forwardness in the mid-range. The speakers not only look stunning they sound excellent for a $500 spend.

For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.

Mark Houston – retro-thermionic
Pioneer-PAX-A20-_fullrange-speaker.jpg
Pioneer-PAX-A20-_fullrange-speaker.jpgPioneer PAX-A20 fullrange driver - 2.8 cu. ft Bass Reflex Cabinet4261 viewsThe speaker cabinets are built using plans from commonsenseaudio.com I have been busy with the 2.8 cu ft cabinet that I bought from them, now about 95% done. French Polished the outside and need to wait a few more weeks for the shellac to set-up before I can give it a final rub down and buff. The sound is absolutely fantastic, with Pink Floyd being top of the pops when it comes to Big response...

The driver is a sing;e vintage Pioneer PAX-A20 full-range driver and it performs remarkably well still. Well that is to my ears and others seem to agree.

The cabinets are made from 18mm MDF and skinned with 4mm cherry-wood ply, corner quadrants from Red Beech and Horns from White Pine - Kahikatea for ease of machining. The cabinets weigh about 25Kg each and the wadding is just normal household wall insulation, but I did put a layer of speaker-cloth over it and stapled in place to look like a bit of duvet.

Keith (Christchurch, New Zealand)
Ion_DIY_2-Way_TMM_Tower_Speaker.jpg
Ion_DIY_2-Way_TMM_Tower_Speaker.jpgIon - DIY 2-Way TMM Tower Loudspeaker5472 viewsThe Ion tower loudspeaker project is Adam's latest diy speaker project. The Ion is a 2-way speaker in a TMM configuration. A Tang Band 25-1372SC 1" inverted titanium dome tweeter is used along with a pair of Audax HM170CO 6" woven carbon fiber woofers.

The Ion speaker project will be a very challenging build but Adam notes that it comes with a huge payoff! The Ion tower speakers have quickly become Adam's favorite loudspeakers.

For the full project details, see the Ion - DIY 2-Way TMM Tower Speaker Project.
Lowther_DX3_Open_Baffle_Speaker.jpg
Lowther_DX3_Open_Baffle_Speaker.jpgLowther DX3 Open Baffle Speakers5983 viewsBaffle height: 56", Baffle width: 25", 20 mm marine plywood
Baffle sloped 10° to the rear to time-align the drivers.
Fane POP100 18": centre 13" from floor.
Lowther DX3 8": 34" from floor, offset 3" from centre line.
Tweeter 2": upward firing from the top of the baffle.

Acoustic shelf: 26" from floor, 9" wide and 6" deep, centre aligned with the Lowther.
Bass box sides: 10" deep at the bottom, 5" deep at top, 26" height.
Bass port shelf: fitted across the centre of the bass speaker.

Crossover:
6dB per octave
Bass turn-over frequency 120 Hz
Lowther roll-off frequency 240 Hz (high frequencies not rolled off)
Tweeter roll-off frequency 6,000 Hz 12dB per octave

The sound has the typical Lowther wide open mid-range, quick and revealing, even with an old, low powered solid state amp. Usually Lowthers are expected to be in horns, but on a big open baffle, they just fill the room and work just as well.

electric triode (Australia)
www.amplifiers.com.au
Stereo_and_Seas_FA22RCZ_in_Open_Speaker_Enclosure.jpg
Stereo_and_Seas_FA22RCZ_in_Open_Speaker_Enclosure.jpgSeas FA22RCZ Fullrange Speakers4501 viewsShown in the photo is my hi-fi stereo setup with and new pair of open cabinet speaker which I built. The diy speakers use a single Seas FA22RCZ driver per cabinet. The Seas FA22RCZ is a 200 mm (8") diameter fullrange driver with a sensitivity of about 94dB. The cabinet has an open bottom, see the Seas FA22RCZ Fullrange in Open Speaker Cabinet photo for more details.

The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.

See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page to translate.

Kind regards,
Carsten Bussler from Germany
Seas_FA22RCZ_in_Open_Speaker_Cabinet.jpg
Seas_FA22RCZ_in_Open_Speaker_Cabinet.jpgSeas FA22RCZ Fullrange in Open Speaker Cabinet6655 viewsThis is a "open cabinet" speaker that uses a Seas FA22RCZ driver (200 mm (8") fullrange). As you can see, the cabinet is open as it has no bottom. The speaker system impedance measures like a poorly adjusted bass reflex box, while the frequency response measures similar to that of a closed (sealed) cabinet. There is no filter network used with the Seas FA22RCZ driver.

The sound is very clean, open and free of compression artifacts, similar to open baffle speakers. Nevertheless, it has a satisfying bass depth.

See my blog for more information. It is written in German but you can use the Google translate tool on the right side of the page.

Kind regards,
Carsten Bussler from Germany
Feastrex-NF-5-Bass-Reflex-Enclosure.jpg
Feastrex-NF-5-Bass-Reflex-Enclosure.jpgFeastrex NF-5 Bass Reflex Speakers5454 viewsThe lovely Feastrex NF-5 fullrange drivers on display at the 2011 Salon Son & Image show. The single fullrange drivers were housed in a bass reflex enclosure and driven by a Mastersound Compact 845 SET amp.

See the Feastrex NF-5 and NF-5ex Drivers SSI 2011 report for more details.
Open-Baffle-Speaker-Ciare-CH250-Front.jpg
Open-Baffle-Speaker-Ciare-CH250-Front.jpgOpen Baffle Speaker with Ciare CH2506908 viewsI have assembled the Ciare CH250 full range driver into an open baffle panel (birch plywood). Size of the baffle: height 80 cm, width 90 cm, thickness 18mm. The plans are the Open Baffle Plans from Stereo Sound "Tube Kingdom". The Ciare's are running without any filter network and sound surprising good.

See my blog for more information - Open Baffle mit Ciare CH250.

Carsten (Germany)
Open-Baffle-Speaker-Ciare-CH250-Back.jpg
Open-Baffle-Speaker-Ciare-CH250-Back.jpgOpen Baffle Speaker with Ciare CH250 - Rear5377 viewsRear view of the Ciare CH250 full range driver in a simple open baffle panel. The plans are the Open Baffle Plans from Stereo Sound "Tube Kingdom".

See my blog for more information - Open Baffle mit Ciare CH250.

Carsten (Germany)
Visaton-BG-17-Voight-Pipe-Speakers.jpg
Visaton-BG-17-Voight-Pipe-Speakers.jpgVoight Pipe Speakers Visaton BG 17 driver8024 viewsA set of voight pipe speakers built around the Visaton BG 17 full-range speaker driver. The speaker is finished with a decorative bamboo mat finish.

See the Voight Pipe Speakers with Visaton BG 17 build thread on the DIY Audio Projects Forum for more information and photographs.
071.JPG
071.JPGsaba open baffle speakers5540 viewsThe system so far. Project Debut III with acrylic platter and Speed Box II, Cambridge Audio 640P phono stage, DBX 223 XL active crossover, Decware SE84C+ set amp for the mid/high freq, Trends TA 10.1 for the low freq, endorphine P-17 open baffle speakers with emminance Delta 15A and SABA greencone oval with Grundig 4" used for tweeter until the SABA tweeter arrives.
057.JPG
057.JPGsaba open baffle speakers6604 viewsThe system so far. Project Debut III with acrylic platter and Speed Box II, Cambridge Audio 640P phono stage, DBX 223 XL active crossover, Decware SE84C+ set amp for the mid/high freq, Trends TA 10.1 for the low freq, endorphine P-17 open baffle speakers with emminance Delta 15A and SABA greencone oval with Grundig 4" used for tweeter until the SABA tweeter arrives.
Fostex-FF85K-Eminence-Alpha-15A-Open-Baffle-Speaker~4.jpg
Fostex-FF85K-Eminence-Alpha-15A-Open-Baffle-Speaker~4.jpgFostex FF85K / Eminence Alpha 15A Open Baffle Speaker8911 viewsOpen Baffle speakers put together by Keith. They use the 3" Fostex FF85K fullrange driver for the mid and top and the 15" Eminence Alpha 15A for the bottom. Sorry I did not get the crossover details.

The little speaker in the corner is a Tang Band D4-1 DIY Back Horn Speaker Kit.
Freds-Place-SAR-Labs-STA80.jpg
Freds-Place-SAR-Labs-STA80.jpgListening Session at Fred's Place - April 20105678 viewsPhoto of the listening session over at Fred's place in April 2010. Components shown in the photo are:
SAR Labs STA80 KT88 Tube Amp with JJ KT88 Blue Glass tubes (top left)

OddWatt Audio DIY KT88 Push-Pull Monoblock Tube Amp Kits with Gold Lion KT88 tubes (bottom middle) put together by Gio.

The small speakers are from a Tang Band D4-1 DIY Back Horn Speaker Kit put together by Gio.

And the large Fostex FF85K Eminence Alpha 15A Open Baffle Speaker were built by Keith.
NCDIYMeet042010b~0.jpg
NCDIYMeet042010b~0.jpgNorthern California DIY Audio meet Roseville, CA 04/24/20104540 viewsNice meeting with Sigfried Linkwitz guest speaker
NCDIYMeet042010a.jpg
NCDIYMeet042010a.jpgNorthern California DIY Audio meet Roseville, CA 04/24/20104992 viewsNice meeting with Sigfried Linkwitz guest speaker
Diaphony2.jpg
Diaphony2.jpg"Diaphony's" An open baffle design6122 viewsConstruction with waive guide prior to final rough finish.
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