lost bass response

Wagener · 30th January 2007, 02:07 PM

I have a 2 channel car amplifier that suddenly lost all bass response. It used to run a subwoofer. It works fine running speakers with the crossover set to mid or high but it lacks the bass component. As soon as the crossover is set to low it produces no sound.

I know there is a feedback capacitor in the circuit that is responsible for bass. I built a leach amplifier a while back but my general amplifier knowledge is a bit rusted. Can anyone recommend me a place to start?

Thanks

Johan Wagener

richie00boy · 30th January 2007, 02:14 PM

Sounds like the crossover switch or one of the filter circuits is to blame.

Nordic · 30th January 2007, 02:29 PM

You didn't try to use the car amp in that 48C weather there this week?

djk · 30th January 2007, 05:08 PM

Probably a vaporized ground trace in the signal path, could be in the head unit.

When the power amp looses its high power ground connection even for a brief instant (you hit a bump), the full supply current is drawn through the shield of the interconnect cable. This vaporizes a trace (usually in the head unit).

Wagener · 31st January 2007, 07:06 AM

the problem is definitely with the amp itself. It produces sound when switched to mid. but there is still no bass response when switched to mid. so its not the crossover switch.

30th January 2007, 02:07 PM	#1
Wagener diyAudio Member Join Date: Mar 2004 Location: Paarl	lost bass response I have a 2 channel car amplifier that suddenly lost all bass response. It used to run a subwoofer. It works fine running speakers with the crossover set to mid or high but it lacks the bass component. As soon as the crossover is set to low it produces no sound. I know there is a feedback capacitor in the circuit that is responsible for bass. I built a leach amplifier a while back but my general amplifier knowledge is a bit rusted. Can anyone recommend me a place to start? Thanks Johan Wagener

30th January 2007, 02:14 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Sounds like the crossover switch or one of the filter circuits is to blame. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

30th January 2007, 05:08 PM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	Probably a vaporized ground trace in the signal path, could be in the head unit. When the power amp looses its high power ground connection even for a brief instant (you hit a bump), the full supply current is drawn through the shield of the interconnect cable. This vaporizes a trace (usually in the head unit). __________________ Candidates for the Darwin Award should not read this author.

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30th January 2007, 02:29 PM	#3
Nordic diyAudio Member Join Date: Sep 2005	You didn't try to use the car amp in that 48C weather there this week?

31st January 2007, 07:06 AM	#5
Wagener diyAudio Member Join Date: Mar 2004 Location: Paarl	the problem is definitely with the amp itself. It produces sound when switched to mid. but there is still no bass response when switched to mid. so its not the crossover switch.

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