[audioengr]

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]

Here is an update.  I was able to determine what the P1 was doing to the P3 when only the I2S cable was connected.  I reproduced this inside the P3 with another mod, so now the P1 is really superfluous IMO.