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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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Diapony_sandOrion.jpg
Diapony_sandOrion.jpgDiaphony' and Orion5429 views04/2010 Northern California DIY Audio meet
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Diaphony7.jpg"Diaphony's" An open baffle design5148 viewsConstruction
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Diaphony6.jpg"Diaphony's" An open baffle design5829 viewsConstruction
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Diaphony4.jpg"Diaphony's" An open baffle design5926 viewsConstruction
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Diaphony3.jpg"Diaphony's" An open baffle design5142 viewsConstruction
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Diaphony8~0.jpg"Diaphony's" An open baffle design5470 views"Diaphonys". A Dipole with a 10" separation between cabinets (21”w *18”h*6”upper cab) to direct reflected waves to the listener. Low distortion driver choices with a SB Acoustics 29RDC-0004 for highs, Usher Audio 8945A for mids, and an Eminence Alpha15A for lows (lower cab same as the upper but extened to 12” depth). These drivers work together nicely together with a 2nd order LR with the low end of the Usher rolling off naturally. Upper cab with a 8" cardboard tube to direct waves from the Usher from the back of the 6" wide speaker box depth to the reflected surface with minimal re-reflection to the back of the driver. I used a 6" diameter plywood rounded baffle ends to reduce diffraction losses and to improve off axis response. Claity SA Caps where important, Solen Fast Caps else where. Goertz inductors with Madisound Sledgehammer for the Alpha 15A. Balic Birch construction with Walnut veneer. The sound? I knew immediately when the SB and Usher were on just a 22" wide by 60" tall board I had made good choices. The cleanest mid I have ever heard. I'm sure there are better ones, but not by much. Voices that were unintelligible on other systems of recordings I know well became understandable - embarrassingly so. A wood block sounds like a real live wood block. I primarily used various tracks off Tania Libertad’s album “Costa Negra and Pacifika’s “Asuncion” for listening tests and crossover tweaking – two extremely well tracked and mastered albums to say nothing of the voices and talent. While listening to track 12 of Libertad’s album “Yo Venco A Ofrecer Mi Corazon”, in my listening area, it becomes to difficult point to speaker placement without visual cues. The Diaphony’s are large, they do need to be about 4 feet away from a back and side wall seem to be the only distracters. Many compliments at the recent Northern California DIY Audio meet outside of Sacrameno, CA.
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DIY-HiVi-Swans-M1-Speakers.jpgDIY Swans M1 Speakers - HiVi Research5186 viewsDIY build of the Swans M1 Speakers from HiVi Research.

See DIY HiVi Research Swans M1 Speakers
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Seas-CA26RE4X-sealed-subwoofer.jpgSeas CA26RE4X 10-inch Sealed Subwoofer5751 viewsSeas CA26RE4X 10" subwoofer in a sealed 1.27 cubic ft cabinet. I used 3/4" maple plywood with mitered, biscuit-joined seams. The driver port was cut, then the lip routed, then scabs glued in with Gorilla Glue, then drilled and fitted with threaded caps. The rear panel was sealed with strips cut from a bicycle innertube as gasket material. Originally wanted to stain black black, but I think the natural wood grain really looks good.
Mark A.
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Tang-Band-D4-1-DIY-Back-Horn-Speaker-Kit.jpgTang Band D4-1 DIY Back Horn Speaker Kit5473 viewsThe fun and simple Tang Band D4-1 DIY Back Horn Speaker Kit. This little speaker kit comes complete with all the parts and tools required (minus a soldering iron). There is no cutting or finishing required (no saw dust or fumes!). The kit is very simple to build as it goes together just like ready-to-assemble furniture.

For a full review of this speaker kit, see: Tang Band D4-1 DIY Back Horn Speaker Kit.
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PeerlessSeas2way~0.jpgPeerless and Seas 2-way Towers in Zebrawood5207 viewsThe fun part about building these speakers was the crossover design with a Zobel and Baffle Step Compensation (BSC). I wanted to try a larger driver than a 6.5 inches. I am really pleased with the sound and image. Unbelievable sound for the cost. The crossover uses open air inductors and Solen capacitors. The Veneer is Zebrawood adhesive backed. I was able to match the grain on both sides and the fronts. One coat stain and finish followed by paste wax. The speakers are drying in the garage awaiting the living room. Next is a pair of open baffle 3 way with active cross using DIY chip amps.
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dsc_0987.jpgDIY Open Baffle Speakers5723 viewsRemoving the most detrimental factor to sound quality - The Box!

Tweeters: 4x Hivi K1
Midrange: Seas L21 RNXP
Woofers: Jaycar CW2119
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Fostex-FE206E-Double-Bass-Reflex-Speaker-Enclosure.jpgFostex FE206E in Double Bass Reflex Speaker Enclosure5683 viewsThis is the simpler enclosure recommended by Fostex for their high sensitivity FE206E drivers. The large magnet and basket spokes of the driver have been covered with bituminous damping. The upper chamber has sound deadening vinyl across the back and the rest of the upper chamber has double layers of thick Dacron lining it. The boxes are fastened using dowels, glue and wood screws. A Speaker Zobel / Impedance Equalization Circuit is used across the driver terminals. The sound soundstage is pin-point sharp and with good depth. Bass is sufficient without being heavy. For under $AU500 these speakers represent very good value. With a sensitivity of 96 dB/W my 6 W Ultra-Linear Single-Ended valve amps can produce a high sound level.

For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.
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reds.jpgDIY PVC Pipe Speakers with HiVi B3N driver5973 viewsThe speaker enclosures are made using various PVC pipe sections. The PVC pipe enclosure houses a 3-inch HiVi B3N fullrange driver. The enclosure is tuned through bass port at the end of the pipe stand. Binding posts are on the back. The frequency range is about 80 to 20,000Hz . There is a nice sound stage and pretty good low end response considering the small size of the driver and enclosure. I would love to hear your comments about this HiVi B3N Full Range Speaker project.
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BrazCherry.jpgOrion DIY speakers5962 viewsThese dipole speakers are available as a DIY project, a kit, or completed speakers. You can purchase the plans from Siegfried Linkwitz (www.linkwitzlab.com).
The speakers use two 10" Peerless subwoofers, an 8" SEAS midrange driver and two SEAS Excel tweeters per cabinet. The active crossover circuit board is also available from Linqwitz Lab. The documentation includes all that is needed to build these yourself. For those who want some of the assembly completed, the crossover is available fully assembled and tested. A kit, unique parts and brackets for completing the construction, and completed speakers are also available. The speakers are driven with 8 channels of amplification (60 watts per channel). One can parallel the woofers to get by on 6 channels. There is much information on the web about the quality of these speakers. Anyone seeking very high quality speakers at a DIY price for music reproduction or for home theater will not be disappointed.
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HiVi-SP10-Subwoofers.jpgHiVi SP10 Subwoofers5906 viewsA pair of subwoofers built by Daniel's following Adam's DIY HiVi SP10 Subwoofer Project. Full details of Daniel's build are available at his webpage.

In the background is are the DIY Hi-Vi 3-Way Tower Loudspeakers also built by Daniel.
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DIY-HiVi-SP10-Subwoofers.jpgDIY HiVi SP10 Subwoofers6243 viewsDaniel's build following Adam's DIY HiVi SP10 Subwoofer Project. Daniel reports that the subwoofers produce low frequencies which are accurate and very well defined. There are many more pictures and information about Daniel's build at his webpage.
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DIY-Speakers-and-Subwoofer.jpgDIY Speakers and DIY Subwoofer 6478 viewsI just finished building some budget speakers and subwoofer. Very basic design but that is the look I was after. It is my first project so I kept the components cheap. It sounds quite good considering the cost. Certainly a lot better sound than the speakers I was considering which cost 5 times the amount. Also I had fun and learned a lot along the way.

To get a perfect gloss finish and without the need to bog and sand screw holes, I first screwed the 19mm MDF together and then laminated (glued) 3mm MDF over the top. Next I trimmed the edges of the 3mm MDF with a router fitted with a laminex trimmer. After a light sand the boxes were ready to finish with no chance of seeing any screw holes.

I also made a cabinet to match and used some perspex for the centre panel and sprayed it the same colour as the subwoofer.

I hope this has inspired any budding diy speaker newbies. Im hooked now, im already planning my next project with better components.

Ben
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Fostex-FE127E-DIY-Bass-Reflex-Speaker-2.jpgFostex FE127E Vented Bookshelf Speaker5141 viewsPhotographs of the finished bookshelf speakers on a speaker stand. The enclosure is based on the Fostex FE127E Bass Reflex Bookshelf Speaker design by Rabbitz.

The enclosure is made from 15 mm MDF and is well braced. The woodworking and finishing of the speaker cabinets was done by a friend.
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Fostex-FE127E-DIY-Bass-Reflex-Speaker-1.jpgFostex FE127E DIY Bass Reflex Speaker6117 viewsClose up view of the finished bookshelf speakers. The speakers are based on the plans of Rabbitz Fostex FE127E DIY Bass Reflex Bookshelf Speakers.

The woodworking and painting of the cabinets were completed by a friend.
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ikyaudio_sound_pipes_small_1.jpgDIY PVC Pipe Speakers with HiVi B3N driver and HiVi T20-8 tweeter 7650 viewsThe speaker enclosures are made using various PVC pipe sections. The PVC pipe enclosure houses a 3-inch HiVi B3N fullrange driver and a HiVi T20-8 textile dome tweeter. The enclosure is tuned through a rear firing bass port. There is a 2-way crossover inside the enclosure and the binding posts are on the back. The speaker sits on a wood platform with spikes. The frequency range is about 65 to 20,000Hz . There is a nice sound stage and pretty good low end response considering the small size of the driver and enclosure. I would love to hear your comments about this HiVi B3N / T20-8 PVC Speaker project.
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