Question about JVC TH-M505 System

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SubWoofer Recently had to replace my Sub cause of the subwoofer not working(amp works fine as it powers all the surround sound speakers. Bought exact same used Subwoofer from auction site and the SubWoofer turns off from too much bass.(average volume is at 30'ish)I still get a picture but no sound from any speakers and the power light from sub turns off. I have to turn whole system off then on again and it works til bass gets too loud then i have to repeat whole process again. If anybody has any suggestions feel free to let me know.

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Re: SubWoofer

Sounds like your original and this sub have bad amps. The amp for the sub is not the same as the amp for the other speakers. The old unit has a dead amp and this new one is on the way out. (Pulling too much current on high bass)

Posted on Jun 15, 2007

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I wish to replace a subwoofer on a surround sound system

In most surround sound systems the sub woofer is powered separately and uses a standard RCA coax connection to the receiver/amplifier.

Replacing is simply plugging in the new and reconnecting the coax cable.

Usually the audio signal is Dolby Digital 5.1 the (.1) is the LFE Sub-woofer. The connection is between the Subwoofer RCA connector on the amplifier and connects to the (LFE-Line) in on the subwoofer speaker.

Hope this helps?




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For starters, it is a home theater in a box. With that being said, highly consider upgrading before spending more money on the system. If thats not even an option, have you tried adjusting the level of signal being sent from the receiver out to the sub? It sounds stupid, but this is often over looked and can sometimes be tricky depending upon the type of receiver you are using, to adjust the level being sent to the sub... Typically when a subwoofer has little to no sound, this is the issue. Also, is the sub powered (does it have its own amplification using a power cord that plugs into an electrical outlet? If so, does it have a volume knob on the back, and does it respond when turning the knob? If its not powered, than your problem is what I described above, unless you've already done that. If that is the case, your speaker is fried... Hope this helps

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You have a very good of the best of SONY..SUB does not get activated automatically especially on STEREO mode.DIRECT STEREO Notes • No sound will be output from the subwoofer.
.your system has Dedicated Power Amplifier for 2 Externally Driven Sub-Woofers (200W RMS x 2) order to activate the sub woofer amplifier you need to make a selection on the surround modes while you are switching the modes of the surround you will see the speaker position on the display of receiver as well..if you do not see the sub woofer it wont be activated..Sound Field Program (A.F.D) is a good example to test it..
Take care and please Remember to rate/vote and give me 4 Thumbs Up
for Helping out the Community :)

Hope this helps!

Additionally please follow the instruction on your user manual to activate the SUB ,as is follows..

Low-frequency (bass) signals can be directed to the
subwoofer and/or the front left and right speakers
according to the characteristics of your system. This
setting also determines the routing of the LFE (low-
frequency effect) signals found in Dolby Digital or DTS
Choices: SWFR (subwoofer), FRONT, BOTH
• Select SWFR if you connect a subwoofer. LFE and
low-frequency signals from other channels are directed
to the subwoofer according to the speaker settings.
• Select FRONT if you do not use a subwoofer. LFE and
low-frequency signals from other channels are directed
to the front speakers according to the speaker settings
(even if you have previously set the front speakers to
• Select BOTH if you connect a subwoofer and you want
to output low-frequency signals from front channels to
both the front speakers and subwoofer. LFE and low-
frequency signals from other channels are also directed
to the subwoofer according to the speaker settings. Use
this function to reinforce low-frequency signals using
the subwoofer when playing back sources such as CDs.

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