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Project Information

Not long ago, I completed a pair of trapezoidal Onken enclosures for the Fostex FE103Sol 4" single full-range driver. The white cones are made of banana! These speakers live in my small home office. The design is by David Dlugos at Planet 10 Hi-Fi in Victoria, BC, Canada. Panels are made from 15mm Baltic birch plywood for optimal acoustics and architectural stability. I alternated the vent spacers between Brazilian cherry (jatoba) and white oak for a 3-wood/3-color visual effect. It was difficult to find a nice way to finish the Baltic birch because of the splotchiness. After much testing on scrap, I ended up using coffee as a light stain-I literally brewed a pot of Trader Joe's French Roast and put it on the wood-which soaked in evenly with a foam brush (six coats) and gave it a nice character (and smell!). Two coats of Minwax satin polyurethane top it off for a subtle sheen and protection. The interior walls are lined with 100% natural wool batting.

The sound is remarkably full, detailed, and dynamic, with a gorgeous reproduction of tonality that conveys the emotion of the music. And all this despite their somewhat diminutive size of roughly 12" H x 7.5" W x 9" D.

Gallery

Comments

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I had to read up on these drivers, quite the following!

Where did you find the bare drivers?

Looks really cool!
 

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Nice! They look like they would be a great speaker for when you don't have a wall behind them…..
 

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splintergroup: They really are excellent. I got one of the last pairs from a Canadian retailer a few years ago, I think solen.ca or Creative Sound Solutions. eBay, diyaudio.com, usaudiomart.com, canuckaudiomart.com, and other used places are probably your best bets at finding a pair. There's also the meta search engine hifishark.com, where you can search multiple sites at once and also set up an agent that will automatically notify you when any go on sale.
 

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HerringImpaired: Thanks! They are best in a small room. In my home office they sound optimal with about two feet of distance between the back of the speaker and the wall.
 

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Those look as cool as they probably sound. It's an interesting design.
 

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Good job.
 
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