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  1. #1

    Member Sales Rating: (0)

    Join Date
    Jul 2013

    Default Wireless F/X surround whistle noise on shutdown

    Hi all,

    I just purchased a wireless F/X surround speaker. A problem - when I power down my home theater system, the F/X makes a very irritating whistling noise - like a bomb dropping in an vintage WWII film. My wife and cat both don't like this, and I may have to return the F/X if it can't be resolved.

    I should note that I am using an Outlaw Model 7125 amplifier. Would it help if I use the line out from the AV receiver/preamp (an Outlaw 990)? But would that affect the sound quality?

    Thanks much.

  2. #2
    Member Sales Rating: (0)

    Join Date
    Jul 2001
    Polk Audio


    Hello harv,
    Thanks for posting on Polk's forum. Give Polk's CS guys a call at 1-800-377-7655, they'll be able to offer some help.
    Regards, Ken

  3. #3

    Member Sales Rating: (0)

    Join Date
    Oct 2011


    Harv, the sound you describe is likely caused by your Outlaw amplifier's capacitors discharging when you power it off. It's actually a fairly common question here, not specific to the F/X surround. If you connect the F/X surround directly to your 990 (great pre/pro; I also have one) you should avoid that problem, and I believe the sound quality will be just as good or better.

    RT-12, CS350-LS, PSW-300, Infinity Overture 1, Monoprice RC-65i
    Adcom GFA-545II, GFA-6000, Outlaw Audio 990, Netgear NeoTV
    Denon DCM-460, DMD-1000, Sony BDP-360, Bravia KDL-40Z4100/S
    Monster AVL-300, HTS-2500 MKII

  4. #4
    Polk Customer Service
    Member Sales Rating: (0)

    Join Date
    Jul 2001
    Polk Audio


    Try disconnecting the input cables then sgut the system down.
    This will tell you for sure if this is a transmitter or amplifier problem.

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