Question about JVC TH-M505 System

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JVC sp-pwm606 Subwoofer wont stay powered. When volume is 30 or above, sub powers down. Please help.

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Hello, it,s very possible that it,s circuit protector built in to the sub (if it,s a self powered sub) gets to the point of overload and shuts off as a protection so that the speaker won,t get damaged and also so the internal amp tha,t pushing the speaker sound is also protected since theese amps all have heat buildup, their are two types of subwoofers ,They are the powered ones and the ones that are powered bt the surround amp ,The ones powered by the stereo surround amp/tuner tend to throw out less power to the sub and the ones that have internal power are mostly higher powered , Another thing you might want to check is your polarity to the speakers and also the omage , Most home theater system speakers are 8 ohm,s but their are speakers and amps that can be changed to 6 ohm,s ..so you might want to check the speaker rating also . Well hopefully you can use theese different methods to at least troubleshoot and discount the thing,s that are not the issues , Good luck and hope theese sugestions might help you , Sincerely Glenn

Posted on Mar 04, 2009

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Posted on Jan 02, 2017

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Powered subwoofer amp repair? On and off works fine.. very weak signal to sub. All wires checked and working fine.


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

Jun 19, 2014 | Cerwin Vega CMX 5.1 Home Theater Package...

1 Answer

WHERE CAN I BUY A SP PWM505 CABLE THAT GOES FROM MY RECEIVER TO THE SUBWOOFER? ITS A HOME THEATER


  • Here is a list of cables for your unit from Crutchfield's.


  • If your looking for the s pin DIN cable from the sub you can get that anywhere. The 8 pin DIN is a standard cord the same across the board. Here are a couple to choose from.



  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Oct 11, 2011 | JVC TH-M505 System

1 Answer

I CANT FIND A SP PWM505 CABLE


  • Here is a list of cables for your unit from Crutchfield's.


  • If your looking for the s pin DIN cable from the sub you can get that anywhere. The 8 pin DIN is a standard cord the same across the board. Here are a couple to choose from.



  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards, Tony

Oct 11, 2011 | JVC TH-M505 System

1 Answer

I have the sub woofer and two sp-thc5f front speakers. Can I hook this subwoofer directly to my JVC 56 high def big screen or do I need a dedicated amplifier that works this sub wooofer?


No, the powered subwoofer gets its signal AND power through the DIN connector so you'd have to second guess JVC engineers on which pins are power or signal; and what voltage level it supplies and then you'd have to come up with a source for the power. Managing the volume and relative levels would be a trick, too. Devastation lies down that path.

Get the prescribed JVC electronics or go with a whole new sound solution.

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1 Answer

My bass powered subwoofer on JVC system doesn't turn on


You need to check the signal. If there is not signal present or the volume is low the sub will not turn on and goes in to sleep mode.

-david

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Feb 11, 2010 | JVC TH-M603 System

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The subwoofer lites but no sound


Have you gone into the menu settings and adjusted the sub woofer volume, some factory settings are set @ zero.

Sep 09, 2008 | JVC TH-M55 System

5 Answers

SP-PWM505 subwoofer does not stay on


Well i had exactly the same problem, my sub turned off right away when i turned the whole thing on. Well i opened the subwoofer and was trying to find out something unusual, i took out, i believe, internal amp, well, whatever that thing is, under the lid. Which one is screwed with 6 copper screws, so you unscrew those screws, lift that lid and that whole board comes out. On that board i find something like burn around one of the parts.

http://www.flickr.com/photos/28004328@N04/3333561417/in/photostream/

you can see it in the pick, the part q2902, then i contacted JVC. At the beginning they said i need to take the whole thing to service center and so on. But later i made them to tell me what kind of part that is, so here :http://www.jvcservice.com/store/ProductDetail.asp?Part=KTC3199/GL/-T
bought soldering gun in home depot for $15, returned after i was done. And that is it, just have to replace it, but total cost only $12 ($5 part +$7 shipping)

May 15, 2008 | JVC TH-M505 System

1 Answer

Sub woofer shuts off


please check sub cable first with another good one and then change sub itself.because it draw too much power.

Jan 05, 2008 | JVC TH-C50 System

1 Answer

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)

Mar 30, 2007 | JVC TH-M505 System

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