DSW MicroPRO 2000 Subwoofer Hum

Crashdot
Crashdot Posts: 182
edited April 2011 in Troubleshooting
I just got a Polk Audio DSW MicroPRO 2000 Subwoofer, but unfortunately it emits a hum at all times from the main speaker driver. This occurs whether or not an audio source is plugged in, and regardless of location or electrical outlet. I assume that this is a defective amplifier, but wanted to ask if anyone else has any suggestion since this is going to cost a bundle to ship somewhere.

Thanks
Post edited by Crashdot on
· Share on FacebookShare on Twitter

Comments

  • dorokusai
    dorokusai Posts: 25,577
    edited April 2011
    Get a cheater plug and remove the ground post from the outlet. I'd bet it's a ground loop.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
    · Share on FacebookShare on Twitter
  • Crashdot
    Crashdot Posts: 182
    edited April 2011
    A ground loop should not be possible if no audio source is plugged in. I've had ground loops in the car but they always disappeared if the audio cables were disconnected. This unit hums if nothing is connected to it other than the power cord, and even through a $300 power conditioner, and the hum is strong enough to visibly move the driver and be heard from 10 feet away in a noisy room.

    Thanks
    · Share on FacebookShare on Twitter
  • Crashdot
    Crashdot Posts: 182
    edited April 2011
    I am looking for quality, which is why I chose a small sealed subwoofer over the two ported bandpass models I already own, but since I can't start with silence when there is no music playing, I think this unit has a problem. I was just hoping there was something I might be missing.
    · Share on FacebookShare on Twitter
  • Polkitup2
    Polkitup2 Posts: 1,622
    edited April 2011
    If the driver is moving with no audio source connected something is wrong with the unit. Call Polk support, they'll take of you.
    · Share on FacebookShare on Twitter
  • Slyder01
    Slyder01 Posts: 115
    edited April 2011
    yes, call polk, they are A1 to deal with. I have an MP2000 and a 4000 and no hum what so ever
    Yamaha rx-a2000 AVR
    Polk csi5 Center
    Polk rt16 Main
    Polk fxia6 Rear Surround
    Paradigm Micro Rear Back
    Onkyo bookshelf Front Presence (for now)
    PSW 450 Front Sub
    DSW MicroPro 4000 Front Sub
    DSW MicroPro 2000 Rear Sub
    Samsung c6300 60 inch LED
    Sony BDPs370
    Room Size 15x30
    · Share on FacebookShare on Twitter
  • Crashdot
    Crashdot Posts: 182
    edited April 2011
    I have contacted Polk Audio who are sending out a replacement amplifier so I don't have to ship the whole unit away. I will try to report again when this is resolved.
    · Share on FacebookShare on Twitter