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Stereo Dropping Volume After Being Played At High Volumes

jackbh241

By jackbh241,
in Four Door Family & Wagoneers

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jackbh241 Collaborator

jackbh241

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My M35 runs an aftermarket headunit direct to speakers and I've had this issue since I bought it years ago. Basically if I turn my music up loud it lasts a few minutes (sometimes a solid 15 minutes or so) but eventually all quality is dropped, volume decreases and gets fuzzy/low end gets cut etc.


I always thought it's probably just a faulty head unit but I've since replaced it and I have the exact same issue. Any thoughts on what it could be/how to fix it? I don't even know where to start?


It's just a standard head unit wired in (no amps, subs etc)


Any help would be greatly appreciated!

  • 2 weeks later...
jackbh241 Collaborator

jackbh241

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You are probably overdriving the output transistors and they are shutting down from overheating. If you want to play it that loud you may need an amp.

Hey Scotty, Thanks for the advice. I had thought the same so I went out and bought an amplifier but it did not solve the problem. It seemed to solve the problem for about two days and then right back into it the only difference is that now the volume/power comes in waves; ie it will drop off, then come back a few seconds later, then off again etc. In the past the volume cut until you skipped a track and then it would come back for a few seconds until it dropped off again.

The only change that I can think of that happened on the third day that it started failing again is that it was a cold morning so I used the heater, is that possibly related?

If any one has any advice it would be greatly appreciated!? we aren't even talking excessively loud volume here (just enough to be clearly audible with an open window) and it's an issue that I can never get to the bottom of.

jackbh241 Collaborator

jackbh241

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So you definitly do not have Bose speakers? Just the normal Nissan stock ones?

Well I have never checked the labels on the speakers underneath the door cards but unless someone has previously changed the centre console all signs point to no. No sub in boot etc or anything either. Would it change the situation if they were the bose speakers?

nickcorr Proficient

nickcorr

Posted
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Bose system has amps and also low impedance speakers. Driving them directly would give problems on several levels..

Might be worth fitting some quaility front speakers and disconnecting the rears. That should fix the issue, as well as sounding better... Assuming that the new head does not wierdly have caught the same problem as the old one...

jackbh241 Collaborator

jackbh241

Posted
  • Author
Posted

Bose system has amps and also low impedance speakers. Driving them directly would give problems on several levels..

Might be worth fitting some quaility front speakers and disconnecting the rears. That should fix the issue, as well as sounding better... Assuming that the new head does not wierdly have caught the same problem as the old one...

Thanks for the tips. Well I swapped the head unit over but used the same wiring jack (it was the same brand so didn't require a rewire). However it doesn't make sense that it would be a short circuit to me because surely then it would be blowing fuses and it wouldn't matter what volume it's at, right? Is there something else in the wiring of the Stagea that could cause this?

coparts41 Community Regular

coparts41

Posted
Posted

in the c34 Prime as I have they use a common ground for the speakers , when I did mine I had to totally rewire the system to create independent speakers , maybe run some wires externally to see if it works before the rewire.

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