Soft hum from Descent

Darude said:

Hi!

I have a pair of Descent subwoofers, which I connect in a chain. According to the manual I shall set the volume on the slave sub to maximum. When I raise the volume without any input connected, I can hear a soft hum when I reach volume 7 and above. Is this normal? Both subs do act the same, even though nothing is connected to them. So I assume that no sub is broken. Is there a way to make this hum disappear?

If you raise the volume on your sub, without any input connections, do you also hear a low hum?

Thanks for you help!

/Darude

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Darude said:

So, if you use the cheater plug and raise the volume above 7, there is no hum at all? Not even a soft hum? Can you confirm this on your sub?

I do not have any hum at all when I set the volume under 7.

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