Larry, just sent you a email. I've had two pairs of dB's,, the first pair when the model went into full production some time ago and a pair I recvd a month or so ago. No hum, buzz or any other sonic abberation. Turn the amplifiers pwr'ing the bass modules off and see if you still get noise. If you have another amplifier that you can A/B that too would be great. Power conditioner, grounds, ,,,? When in doubt contact Kevin at VSA. Your 99's should be dead quiet.
Jack
Jack
Jack
Jack