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lost bass response
lost bass response
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Old 30th January 2007, 02:07 PM   #1
Wagener is offline Wagener  South Africa
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Default 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?


Johan Wagener
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Old 30th January 2007, 02:14 PM   #2
richie00boy is offline richie00boy  United Kingdom
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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, modules and more.
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Old 30th January 2007, 02:29 PM   #3
Nordic is offline Nordic  South Africa
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You didn't try to use the car amp in that 48C weather there this week?
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Old 30th January 2007, 05:08 PM   #4
djk is offline djk
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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).
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Old 31st January 2007, 07:06 AM   #5
Wagener is offline Wagener  South Africa
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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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