MicroPro 3000: constant, loud rumble when turned on

mrceollamrceolla Registered UserPosts: 3
My sub woke me up in the wee hours of the morning today. I thought a gigantic truck was rumbling through the neighborhood, but no, it was my sub. It was very powerful, throwing the driver to the extent of its range. I unplugged the LFE cable from the back but the sound continued. Only flipping the power switch stopped the noise. I unplugged for a while and tried turning on again, the noise was still there. I played with volume, crossover knob, and the little 12v/auto-sense switch, and nothing stopped this horrendous rumble. Well, switching to 12v stopped the noise mostly, only because I don't have a 12v trigger cable running to it, but having the switch to 'On' or 'Sense' allowed this terrible noise. When on 12v I could hear a faint hiss or hum still coming from the sub's electronics but I seem to recall this even when the sub worked normally.

As I mentioned, this happened in the middle of the night. The sub was set to 'Sense' but the receiver was off and nothing was playing.

Is my amp toast? Driver toast? Any way to reset the amp or otherwise troubleshoot this problem?

Much thanks for any advise!

Comments

  • KennethSwaugerKennethSwauger Moderator Posts: 6,065
    Hello,
    In all likelihood there is a problem with the bass amplifier, best to call Polk at 1-800-377-7655 select option 1. Have the serial number and date of purchase available when calling.
    Regards, Ken
    "Passion is inversely proportional to the amount of real information available", G. Benfield
  • mrceollamrceolla Registered User Posts: 3
    Hi Ken,

    Thank you for your reply What will they be able to do for me? I'm quite sure I'm past the warranty period so I don't imagine they'll be sending me a new one.

    Thanks!
  • ken brydsonken brydson Posts: 6,563
    mrceolla wrote: »
    Hi Ken,

    Thank you for your reply What will they be able to do for me? I'm quite sure I'm past the warranty period so I don't imagine they'll be sending me a new one.

    Thanks!

    How old is it? Amps have a 5 year warranty IIRC.
    HT/Main- Panny 50" G10 Plasma, Pioneer SC-1222k AVR, Panny DMP-BD60 BDP, Polk LS90 mains, CS350LS center, LS/fx side surrounds, LS50 surround backs, SVS 25-31PC+ sub, Harmony One

    Office Rig- Marantz 2252B, Denon 2910, Kenwood KD2070 TT, Polk RTA 12B's/ RTA8t
  • KennethSwaugerKennethSwauger Moderator Posts: 6,065
    Hello,
    Actually the bass amp has a 3 year warranty and the woofer has a 5 year coverage. If you are outside the warranty period Polk can either repair the amp or offer a replacement. Since you've joined CP they offer a reduced price and shipping savings to members, so let them know. In any case begin with a call to them.
    "Passion is inversely proportional to the amount of real information available", G. Benfield
  • mrceollamrceolla Registered User Posts: 3
    Yikes! Polk guy on phone said $600 for a replacement amplifier. I can get a brand new one on Amazon for $900. Yes, I'm out of warranty coverage. I forgot to ask about the CP discount. What does CP stand for? How much is the discount usually? If it's not 50% I'm not sure I'm interested. :-(
  • KennethSwaugerKennethSwauger Moderator Posts: 6,065
    "Club Polk", I believe the savings is 20% reduction and free shipping within U.S.
    "Passion is inversely proportional to the amount of real information available", G. Benfield
  • rooftop59rooftop59 Posts: 3,752
    Yea, I’m a polk fan but to be honest I would take my $600 and buy an SVS SB1000 or 2000. (couple places have the 2000 for $699 shipped).
    HT Rig:
    Yamaha RX-A1010; Parasound HCA-1000a; Arcam rDac; Mains: PSB Imagine Mini + MartinLogan Dynamo (original) sub; Center - Def Tech Procenter 1000; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - SVS PB10-ISD; Sony BDP-S390, FireTV gen 2

    Master Bedroom
    Marantz SR-5007; Audiosource Amp Two, Dynaudio Emit 10, NHT Super One CI, ACI Titan subwoofer, FireTV, Arcam rDac; Bryson BPD-1
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