Question about JVC SP-PW100 Subwoofer

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JVC Surround Sound System

When we are watching a movie and the surround sound volume is above 45 and a climactic moment arises in the movie (music gets loud all of a sudden), the whole surround sound system shuts off. All you hear is a click and it's off. Then we have to turn it back on and the volume setting is set to the 30's (I've seen it as low as 32 and as high as 39). What could be causing this? The only power we lose is the surround sound system. It's like it's blowing a fuse or something and then resets when we turn it back on. Please help!! Thanks!

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  • ztmdad Nov 06, 2007

    Same problem if volume is above 40 then Subwoofer shuts off and you have to shut the system off to get any volume back.,

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  • JVC Master
  • 5,342 Answers

The click will be a relay to protect the main amp overloading. In many ways you are driving the amp to hard, unless there is a fault on the main amp which means it can't take the full load that it should handle. One cause of this for example would be a speaker that is either the wrong ohms, or of a lower wattage than what the amp can put out. Or in some cases a faulty speaker, or if the wiring is not good shorts when the speaker shakes when a very loud noise comes from it.
Things to check:
1 That no speaker is lower ohms than the amp.
2 That no speaker is lower in watts (RMS) than the amps total output for that channel it is on. Remember not all surround amps have the same volume on each channel.
It is of course possible to use smaller wattage speakers. But if you have an amp that can output say 200w. Connecting an 80w speaker to it would really limit the amount the volume control could be raised to.
3 Each speaker is working right. Plus all connections are neat with NO possibility of shorting.

If all of these are good then you have a fault on the main power amp. Probably one or more of the output device(s)

Posted on May 09, 2017

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Posted on Jan 02, 2017

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are you trying to use the surround sound for movies or music ? , ive got the dvd version of this system (sc-dv290) and ive noticed the surround sound tends not to perform well with music , but sounds great with movies. i think its because the movies have dolby digital and music does not. The dolby pro logic in my opinion doesnt really make that much of a difference in sound unless the sound is cranked up past 44db on the amplifier. the only cables you need are the ones that are attached to the surround sound speakers and they cannot be removed so it cant be the wiring . I reckon you have a 1 - faulty system 2 - listening to music 3 - maybe not pressing the pro logic button on the sound processor. Hope this helps

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