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technical pro hb2502u digital hybrid amplifier premap tuner with usb and sd card inputs black

  1. Subwoofers, Bass, and Transducers
    The crackling output reminds me of oxidized/corroded switch contacts in my Dynaco preamp. I use Deoxit to clean those contacts. However, there are no such switches in the HB-2502U. I think the only contacts that may cause the crackling is where the speakers hook to the amp via banana plugs...