MFW-15 subwoofer death hum

mdaudioguy
mdaudioguy Posts: 5,165
edited October 2013 in Speakers
It was bound to happen eventually.... Turned on my system yesterday to hear some tunes and after the first song ended, there was a strange hum coming from the sub. Powered it off and on, still there. Powered off, unplugged the input cable, and powered back on again, to no avail. Still humming whenever powered and on. All the finger crossing and knocking on wood finally failed me after five years. So, now the (physically) biggest part off my HT sits dormant. Still contemplating my next move. I've read that the caps could be the problem, so maybe I'll try a recap and see how much more time that buys me.
Post edited by mdaudioguy on
· Share on FacebookShare on Twitter

Comments

  • erniejade
    erniejade Posts: 6,321
    edited October 2013
    I have a velodyne spl1200 ( great sounding sub btw) that developed a hum. I took it in and they did re cap it and did something with the power supply. It has been fine ever since and im going on 4 years since I had the work done.
    Klipsch The Nines, Audioquest Thunderbird Interconnect, Innuos Zen MK3 W4S recovery, Revolution Audio Labs USB & Ethernet, Border Patrol SE-I, Audioquest Niagara 5000 & Thunder, Cullen Crossover II PC's.
    · Share on FacebookShare on Twitter
  • rooftop59
    rooftop59 Posts: 8,121
    edited October 2013
    I am sure that you know that there is a guy on some forums that repairs and upgrades those amps (for a price of course): http://www.seaton-sound-forum.com/?forum=154357

    And of course you can always just build a plate or have your local metal shop make one (mine charges me 15 bucks) and run an external amp since your using a receiver. The hardest part of making a sub is building the enclosure properly matched to the driver, so even if the amp fails you still have something salvageable.

    Good luck and let us know how it works out.
    Living Room 2.2: Usher BE-718 "tiny dancers"; Dual DIY Dayton audio RSS210HF-4 Subs with Dayton SPA-250 amps; Arcam SA30; Musical Fidelity A308; Sony UBP-x1000es
    Game Room 5.1.4:     Denon AVR-X4200w; Sony UBP-x700; Definitive Technology Power Monitor 900 mains, CLR-3000 center, StudioMonitor 350 surrounds, ProMonitor 800 atmos x4; Sub - Monoprice Monolith 15in THX Ultra
    Bedroom 2.1     Harmon Kardon HK3490; Bluesounds Node N130; Polk RT25i; ACI Titan Subwoofer
    · Share on FacebookShare on Twitter
  • Eocuph
    Eocuph Posts: 75
    edited October 2013
    I have a bunch of polk rt3000p's that have the same humming issue. It seems like it's a common issue with age.
    · Share on FacebookShare on Twitter
  • rooftop59
    rooftop59 Posts: 8,121
    edited October 2013
    I actually don't think that it is age, but a QC problem with certain makes/models. I have had plenty of amps (sub and otherwise) that are much older and still fine. But Polks plate amps on their powered towers and pretty much every amp that AV123 made have this issue. Just whole batches of bad lemons...
    Living Room 2.2: Usher BE-718 "tiny dancers"; Dual DIY Dayton audio RSS210HF-4 Subs with Dayton SPA-250 amps; Arcam SA30; Musical Fidelity A308; Sony UBP-x1000es
    Game Room 5.1.4:     Denon AVR-X4200w; Sony UBP-x700; Definitive Technology Power Monitor 900 mains, CLR-3000 center, StudioMonitor 350 surrounds, ProMonitor 800 atmos x4; Sub - Monoprice Monolith 15in THX Ultra
    Bedroom 2.1     Harmon Kardon HK3490; Bluesounds Node N130; Polk RT25i; ACI Titan Subwoofer
    · Share on FacebookShare on Twitter
  • Eocuph
    Eocuph Posts: 75
    edited October 2013
    Yeah I agree, that's a good point. There are 2 versions of the rt3000p amps and I wast told by "electrontix" from eBay (he repairs rt3000p's) that the issues are a lot less common with the newer models.

    I hope the humming sound is a cheap and easy fix for you so that you can continue enjoying your subwoofer:)
    · Share on FacebookShare on Twitter