Question about Polk Audio db400 Coaxial Car Speaker

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How to repair a blown sub


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I have a problem, i dont think my speaker is blown, but , it just looks like the wiring broke on the coil at the end that connects to the cone, i think thats how i can best describe it..its a 10" pioneer IMPP w/ integrated voice coil cooling system 500w max and also it looks like where the wires broke, the coil cam unglued from the cone.. hope someone can help this something i can repair on my own or is it garbage?

Posted on Jan 14, 2008

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If the wires just disconnected, you could probably get some glue and glue it where it was originally.

Posted on Jan 20, 2008

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What blew on the the voice coil burnt

Posted on Jan 06, 2008

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1 Answer

How to trouble shoot a sony sa-wm20 that stopped working

With subs, it's either
  1. a blown fuse (no power at all at the sub);
  2. a broken input (#1 cable, #2 sub input socket, #3 blown sub plate amp);
  3. incorrect connection at the receiver end or the wrong settings
You've ruled out most of this because another sub works in its place. So what's left is either sub settings, or a busted sub.

The sub settings for testing should be: Crossover frequency - Max; Volume - Mid; Phase - Normal.

As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay or not.

Most subs auto sense a signal. So if the Sony isn't doing that then there's the problem. Given that these are very much a budget sub, I'd be inclined to have a look for something simple such as a broken solder joint or bulging capacitor. If it's anything more indepth then the cost to repair will outweigh the value of a replacement.

Aug 05, 2014 | Audio Players & Recorders

6 Answers

No Power


if u change the fuse inside the actual sub shud power up ok


Feb 26, 2009 | Sunfire True Subwoofer Mark IV Subwoofer

2 Answers

I had my boss 2400 watt 2 channel amp hooked up in my car. I had one sub on each channel and one of my subs blew. I unhooked the positive speaker wire on the blown sub, everything was fine. Driving down...

If your amp started smoking, probably not. Due to your description, did the other sub really blow? I would hook it up to another amp to test it. It may have been a channel in your amp. As for repairing the amp, the parts and labor to repair will probably cost you more that to just replace the amp.

Sep 06, 2011 | Boss Car Audio & Video

1 Answer

Athena AS-P4100 Sub Woofer - blown main fuse - who repairs these?

Sorry I can't solve your problem. I think the main fuse on mine is blown too. Can you tell me where it is located?

Mar 09, 2010 | Athena AS-P4000 Subwoofer

1 Answer

Quest subwoofer pops every 40 seconds or without any input. Does not produce any bass or output

Problem may be a blown internal amp module. Some JBL powered subs have this same problem, emiting a burst of noise from time to time even when no signal is being sent to them. I've tried fixing this problem before with only marginal success, even going so far as to install a small cooling fan inside the sub to control the overheating that can destroy these modules. If the module is blown, you can probably replace the whole sub for about what it would cost to repair it. Look into this carefully before you commit to a repair job.

Nov 29, 2009 | Audio Players & Recorders

1 Answer

Sub goes full blown loud when plugged in to wall

It sounds like a power supply failure. It needs to go to a repair shop.

May 05, 2009 | Infinity BU-2 Speaker

1 Answer

Only one thump when car is turned on. problem in amp strength or subwoofer?

try pluging in a diff, speaker to the amp see if u get sound.try powering the sub with a home radio just to see if u get sound at all if ur getting sound from the sub then its the amp but u could of damaged it when the amp over heated

May 03, 2009 | Kicker SoloX S10X2 Car Subwoofer

1 Answer

SPL160's with 2 blown voice coils

Downgrade to two subs.

The simple fact of the matter is these are long out of production. Nobody can get you a replacement coils/spiders at this point.

The sub could be rebuilt, but it could only be ran by itself. It would be a different sub all together and couldnt be run with the counterparts.

Bad solution for you but the only viable one.

Mar 03, 2009 | Soundstream SPL 15 Car Subwoofer

1 Answer

I have two 1200 watt sony amps bridged red light on in one why?

If you are certain speaker isnt blown and you have correct phase wiring and so forth you have whats called a solder jump which is internal repair by dealer only! buy a new amp at dealer wholesale price here cheaper than having it repaired unless under warranty go here for wholesale pricing on almost everything audio wise:

Jan 03, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

Blown subs

My big question would be "Did your friend know the subs were dead when he gave/sold them to you?" If so, he needs a swift kick in the ***.......But onto your question.

If the cone doesn't move at all, or there's a scratching sound when it moves, you've definitely have problems. I have no firsthand experience with speaker repair, but I do know it exists. A quick Google search for "speaker repair" can give you some ideas for places to ask. Keep in mind, most of the speakers that get repaired are those that are discontinued, classic, or otherwise expensive enough to make the repairing of it a better option than replacing it. In your case, it may be the same price to repair it as it is to replace it.

Aug 01, 2008 | Orion Xtreme XTR12 Car Speaker

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