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Hello,

We recently had a heat wave on the East coast starting on Saturday. That
same day I turned on my home recording computer system and had a nasty hum.

I ripped apart the system and isolated the hum between the power amp and the
speakers. I have a Hafler TA1600 power amp. If I plugged one speaker into
the amp with no input signal, the hum was there.

I've been reading up on ground loops and such - but they all talk about
mismatched ground across electrical components. Can I have a ground loop
between an amp and "just" speakers"?

Does humidity in the air cause hum somehow? Can I get fancy speakers to
eliminate this? Or maybe my speaker wire shielding is bad?

The heat wave broke last night - humidity is back to normal for NJ. And the
hum is gone....

Thanks in advance,
bruce