2. digital
  3. 1095957596

Problem with Perpetual P1-A.

I bought the whole perpetual package used on audiogon half a year ago, and it came with speaker correction, (I don't know what speakers it was programed for, and that isn't my concern right now). The problem it has always had ONLY when speaker correction is selected is that it causes a ringing through the tweeter with every bass note. the p3a alone does not do this so it is coming from the p1A and, again, only when speaker correction is selected. I don't see my speakers as being a problem becuase I output everything into my headphones and heard the same ringing. I use a coax input to the p1a and have not been able to try a balanced digital cable input because I don't have that type of transport. I use the I2s cable between the p1 and p3 and trying a balanced cable between them did not solve the problem. i think i've had a coax between the two and it didn't go away. the i2s should work anyway.
I can enjoy the perpetual equipment with resolution enhancement on, but the speaker correction does something special which I really like and often listen to it despite the ringing. Still, that ringing is really annoying and I usually end up switching back and forth. The gear does not have any mods as far as I know.
Anybody who knows these units or is expert in digital equipment in general might know what's going on.
Perpetual has a forum on their site, but I thought I'd check here first.
nola_powerman

Showing 1 response by perose

perose
40 posts
 
Your SOCS is for a specific speaker. Using it for a speaker, or headphones, other that what it was designed for will cause frequency and phase changes that will most likely degrade the sonic performance of they system.

If you have the single curve SOCS, there were known problems with the algorithm that caused a ringing on heavy bass passages. PT modified thier SOCS code to implement a system with 9 correction curves. This allowed several variations on the corrections that could be applied. A side benefit of the 9-curve system was that the ringing was significantly reduced however, not eliminated.

PT is currently in the final beta testing of a fully rewritten P1-A software SOCS package and have stated that this will be availabe to current SOCS owners which was a $400 option. You should contact them for details.

Bottom line is that your version of the SOCS software has known problems and there is nothing that you can do about it at this time.
More to discover