Bass leaves after amp warms up?

Here is the info on the Autoformer Zeros Devices

I agree that these appear to be a viable solution for providing your amp a load that it is more suited to drive. Resulting sound should be different, but assuming the amp/speaker load match is the issue, which seems the most likely still, this should resolve any issues with not enough gas for the bass at reasonable volumes.

Should be different for the better.

I'm pretty sure the BRyston amp you would need to drive the PSB load effectively is not the same as what you would find in any typical integrated amp, but have not done the research on Bryston specs to say for sure. I would not equate any high power integrated to top notch similar powered separate amps without having the numbers in front of me that establish that.

I would keep power conditioners out of the equation period. The symptoms occur with system warm up. If anything the OP should be backtracking to find out where it all started.

"I would keep power conditioners out of the equation period. "

Agree. Once the issue with deteriorating bass/dynamics is resolved, then add it in gradually perhaps and see what might be had further from there. Power amp would be last thing to use with a conditioner and should be totally optional at that point.

04-17-13: Bifwynne
Al and Ralph -- take a look at the graphs at the URL above. I'd like to read your thoughts about whether a solid state amp, or any amp for that matter, would get indigestion from those impedances.

Hi Bruce,

Thanks for providing that additional data. Earlier in the thread I had linked to JA's measurements, which provide better resolution than the Soundstage graphs. Also, for some reason the worst case numbers you quoted from HT Lab differ from JA's, with his numbers being more severe.

In any event, IF the problem is amplifier-related I agree that the Zeros would be a reasonable solution, used with their 2:1 impedance ratio. Higher ratios would reduce the maximum amount of power that could be delivered to the speakers to significantly less than the amp's 200W/8 ohm rating.

That said, there are certainly a great many separate power amplifiers that can be expected to provide good results with these speakers, especially given that phase angles are very benign aside from the dip that occurs around 27 Hz. Although, of course, a suitable high quality separate power amplifier would most likely cost much more than a set of Zeros.

Best regards,
-- Al