2010 Ottawa DIY Audio Get Together

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Owen Columbus setting up his line arrays. They use 25 Vifa TC9 drivers per side and are equalized using a Behringer DEQ2496.
 

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Oops

Darn! Sorry I missed this. I've been working so many hours (the high-tech curse) I didn't even know this happened till after the fact.

Looked like fun, and I hope it happens again. I have some DIY speakers and preamp I could cart along.

Great organization job guys!

Dave
 
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More photos - electronics

This is my push-pull class A Thagard-Pass A75. Twelve MOSFETs per side (six IRFP240 and six IRFP9240). The heatsinks run hot, and I must run the amp at lower bias. This was my first DIY project.
 

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Owen's balanced Zen line stage. This is a classic "differential pair" topology with zero negative feedback. Impeccable crafstmanship inside-out. Each channel has its own supply.

Look at these custom cases and pcbs, at the wiring, umbilical cords... wow!
 

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Nelson Pass's balanced Zen line stage must have been a popular project. Our other preamp at the event was based on the same circuit. This is my humble take on it. Very close to the original article. For the input and output volume controls, I was fortunate enough to find and obtain quad Blue Alps pots.
 

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