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New Perpetual P1/P3 configuration

I have been busy modding a P-3A for a customer, who also asked me to design a new I2S cable. Since this is a proto, I am doing this for free for him.

Anyway, here is what I discovered:

After the P3 mods, the P1/P3 in typical configurations sounds a bit better, but the P3 still sounds better alone, and with the mods, MUCH better, with one exception. If I connect the I2S cable ONLY to the P1, the P3 imaging gets even better with horns becoming more coherent and solid. The cable I made improves this even more with better HF extension. I am not sure what the P1 is doing for the P3 in this configuration (which I call #5), but I really like it. I will be doing some scope probing this afternoon to try to determine what is happening.
audioengr
kr4's avatar
kr4
3,685 posts
 
And what mods are they?
audioengr OP
3,282 posts
 
KR4 - the mods include 11 traces that are cut, 12 components that are deleted and 18 components that are added, plus some point-to-point wiring. Non-trivial, I assure you. Takes at least 8 hours to do it with the right parts, equipment and a very strong magnifying glass.

As for the I2S cable effect, I was able to reproduce the effect with a mod inside the P3, making the P1 superfluous, IMO.
lafish
151 posts
 
I did play on the mod, replace the existing OpAmp to OpAmp627 and 2 more (cant remember model). Sound improves a lot after that.
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