I have previously posted about P350 speakers vs the DSP5200s. My observation was that they both sound great but the DSP5200s seem to be more consistent. Specifically, I observed that the P350s show the difference between a good recording and a bad one whereas the DSP5200 close that gap and show less variation. Example: P350s had a large variation in bass, whereas the DSP5200s always had relatively strong bass.

I have just noticed something very interesting. I switched amps from G57 to G55 and it seemed to improve the sound. That doesn't make sense (unless there is something wrong with the G57, and that doesn't seem to be the case) because the G55 is just a multi-channel and lower power version of the G57. Then I switched back to the G57 and it sounded even better.

I may have to revisit my speaker cable solder joints, which is a big hassle because the cables are in-wall. They are a heavy gauge wire onto thick spade terminals which made flowing solder difficult without overheating the insulation and wicking. It is possible that there is a cold solder joint making an intermittent connection.

Previously, there were loose connections in my house AC power line at the circuit breaker box. Fixing that problem increased AC line voltage by 10V. I measured 0.5 A rms, which equates to 20 ohms contact resistance! Imagine a similar contact problem in the speaker cable. 20 ohms in series with a speaker cable would certainly explain everything.

The variation mentioned above is gone or at least greatly reduced. I feel bad for pointing to the P350s for what is apparently something else. They really are a super speaker.

DSP6000, DSP5200, DSP5500VC, P300W, SW1600, G68, 568.2, HD621, G57, G55, Oppo BDP-105.