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Sr7200 LFE (sub woofer) output stopped working

I have a powered sub woofer hooked up ( 12" Polkaudio) and suddenly it stopped working ? The sub seems to work fine (with other souces).

What happened ?

Posted by domsal on

  • karadio Jan 03, 2008

    I have the same problem with my PSB 10" powered sub. I lost sound from it about the same time that analog sources stopped working with the surround modes.

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Chances are if The Receiver only has sound in Stereo Direct Mode and all surround modes and Sub out are Inop the DSP (Digital Signal Processing) Card is most likey defective. These boards are not available from marantz (D&M Holdings) and must be Component level repaired which usually is not cheap. If Only the Sub out is not working check setup to be sure sub woofer is set for on. Also If On Screen setup menu does not appear on video monitor Unit may need to be Reset manually which entails discharging a Capaitor on main P.C.B Contact [email protected] for details

Posted on Jan 10, 2008

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Don't forget to check for a tripped circuit breaker or blown fuse on the stereo's speaker output. If your sub is connected to a low level output - this shouldn't be a possible cause - as circuit breakers & fuses are usually on amplified (high level) or speaker outputs.

Another possibility is that the settings of the stereo has been changed from a *.1 system to plain stereo 2.0 or some other setting that disables the LFE (low frequency effects) or sub woofer audio output.
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