Question about Marantz SR-7200 Receiver

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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 ?

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  • 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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  • 67 Answers

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 kstahl65@att.net for details

Posted on Jan 10, 2008

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Posted on Jan 02, 2017

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The connection on the receiver would be the sub woofer out. Not a sub woofer out LFE, a sub woofer out with speaker wire connection. From there you plug it in to the top section of the available terminals on the sub you are referring to (speaker level input). One in positive and the other in negative matching what you did on the receiver with correct ends. The speaker connections underneath the top connections is for additional speakers like surrounds to be able to be connected directly to the sub woofer speaker level out for sound. This of course would be for an older receiver connection. I do not think it is possible to convert this connection to an LFE and have it work properly. If the receiver does not have sub woofer speaker connection and only a RCA out then you can try to connect both rear speaker connections from the receiver to the speaker level inputs on the sub and then connect your rear speakers to the speaker level output on the sub to power them. This is an active sub woofer but for some reason they made it connect as if it was passive. I am not sure if this sub is designed for really low frequencies required for movie or if it is better for music.

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1 Answer

No Sound


This might very well be a fuse - check by setting the sub woofer to "On" to see if it powers up. If it does, there may be a problem with the sub woofer audio cable(s) or connection(s).

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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Your receiver should have an RCA connector on the back panel that will be marked "sub woofer" or "LFE out". That connects to your sub woofer with a standard RCA type cable. Also, some powered subs have left and right speaker level inputs and outputs in which you would indeed run the sub woofer through the speaker outputs. The down side of that type of connection is that the line level converter inside the sub woofer will take a slight amount of your receiver's output power, although that is rarely detectable. Also, if you have a Dolby Digital receiver, using this connection method will take away systems ability to accurately control the low frequency effects of a soundtrack.

Good Luck,
BB

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