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Old 10th May 2002, 02:20 AM   #1
Opie is offline Opie
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Join Date: Oct 2001
Location: UW Stevens Point Campus
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I would like to build a pass labs son of zen for my midrange horn speakers. The horns have a sensitivity of 109 db per watt, so I think that about 2 watts will be enough to power them. According to passdiy.com I would need a rail voltage of around 8 volts. Is this too low for this amp for good quality sound? How much capacity should I have in the power supply? And finally how much heatsinking will I need?

Any help would be great!

Thanks in advance,

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Old 10th May 2002, 03:29 AM   #2
paulb is offline paulb  Canada
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Join Date: Jun 2001
Location: Calgary
I thought that Nelson stated the SOZ range was from 5 to 50 watts. At the lowest levels, the voltage drop across the transistors becomes more of a factor, so I'd recommend you look at the 5W version unless you have money, size, or heat constraints. I think there's enough info in the article to scale it for 5 watts, but if you have trouble interpreting the graphs, etc. let us know.
More power than necessary is never a problem, but less is.
Good choice for a beginner amp, by the way. Very simple.
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Old 10th May 2002, 08:22 PM   #3
Nelson Pass is offline Nelson Pass  United States
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Perfect application for SOZ. With horns that efficient,
consider the filtered power supply from Zen Variations
part 3.
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Old 10th May 2002, 08:39 PM   #4
HarryHaller is offline HarryHaller  United States
Join Date: Feb 2002
Location: Dallas,Texas
Question Son of Zen

And maybe could drop the value of the output resistors and get some damping factor improvement. Herr Pass?
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