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Old 21st December 2009, 07:20 PM   #1
Nullboy is offline Nullboy  United States
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Join Date: Oct 2004
Location: St. Paul, MN
Default Fidelity of Son Of Zen (SOZ)?

The design of the Son Of Zen amp has intrigued me for years and I think I've found a way to build one without breaking the bank on heat sinking. The larger question is what level of sound quality can I expect from a SOZ amp?

I know that Mr. Pass has graciously shared many interesting designs with the DIY community and some of those designs are interesting from a designers view (how to build using certain topologies) but the sound quality is a little lacking. Please don't interpret my statement as criticism of Mr. Pass's designs. I've read many of his papers and enjoyed each one I've read.
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Old 21st December 2009, 08:11 PM   #2
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Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
With the right speakers it can sound darn good. But the amp has a verry low damping
factor and you need to keep this in mind. When I built one I was using an open baffel
speaker with a qts of .4 but with the low damping factor of this amp the new QTS was about .8 so in my case it sounded better than an amp having a " better " damping factor.
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Old 21st December 2009, 11:01 PM   #3
Nullboy is offline Nullboy  United States
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I would be driving a set of Jordan Jx92s drivers in a 0.25 cubic foot ported box or the set of open baffle speakers I'm building based on Martin J. King's (MJK) design based on an Eminence Alpha 15A and a Fostex FE103E (OB Theory). Though I will be replacing the FE103E with an FF85k.

Will the SOZ match up well with my speakers?
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Old 22nd December 2009, 01:17 AM   #4
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I got quite good response from the Jordans in a .4 cf box
with SOZ, and you can tweak it similarly to what I did in
the "Current Source Amplifiers and Sensitive Full Range
Drivers" article that you can download from

Pass Laboratories - Manufacturer of high end audio equipment.

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