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Don't reconnect the speakers to any amp unless you check them with an ohm meter. They should not show any DC resistance less then 3 ohms if they are rated at 4 ohms and 6 ohms if they are rated at...

It could be a dodgy laptop plug or interconnect? Try to see if this happens with other source. Also try to use other input on the amp too, in case one of the input relays is sticking....

I would try another amplifier and drive it directly from the flac and see if things improve.

Don't actually think the pm350 has any relays for speaker selection, but if it has you should hear clicking noises when you press the A/B buttons. Relays are used in more expensive amps as they are...

Stating the obvious, but if you stack, just wire everything on A to get you going....

Must say have not seen this before but reading it confirms to me my original suspition that class D is a no go for HIFI....

Looking at the wikipedia page start to feel a bit more unconfortable with the technology. It looks like staying digital untill the end is not a practical proposition as feedback cannot be applied...

My feeling is that this technology needs to be perfected before it takes over from classical amplifiers. The fact that the final stage is the DAC is good in principle as the signal is not degraded...

Strictly if the amplifier is designed for 8ohms speakers will not be safe to use it with 4ohm speakers. This one from Pure as is part of a system with its own speakers may not be intedended to be...

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