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Old 9th February 2013, 10:45 PM   #1
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Default Change capacitors in JVC amplifier

I got an old JVC (HX GD-8) stereo amplifier. this amp is a bit special, because it has two seperate subwoofer outputs on each channel. I'm only using one channel, and I'm using a SEAS L26ROY 10" subwoofer. the problem is that when I play songs with hard bass puches at high volume, it sounds like the amp don't get enough juice to provide all the power.

I found a service manual at the internet, and i disassembled my amp. I found out that each subwoofer channel only had 4700uF caps! is that the reason why the sound (hard punches, not pure bass) sounds weird?

I found some caps on ebay. Do you think 10000uF at each channel is enough? The caps inside the amp is rated 71v. Is it a problem if I replace them with 63v or 100v caps instead? The subwoofer channels is powered by an STK412-430, but I can't find a good datasheet on that one.

Last edited by hansibull; 10th February 2013 at 11:07 AM.
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Old 9th February 2013, 11:54 PM   #2
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Amplifier manual:

http://resources.jvc.com/Resources/0...T0125-001A.pdf

Sub: 6R - 16R

Speaker:

The Madisound Speaker Store

4R

Might be an issue.
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Old 10th February 2013, 09:58 AM   #3
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yup, thats a bummer, I know. but do you think that changing capacitors might help anyway? A pair of 10000uF caps isn't so expencive. Is it worth a try?
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Old 10th February 2013, 10:30 AM   #4
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It's only a 195W sub output and that might be exagerated.

A 10" sub at full pelt may well be starved of power at high volume.
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Old 10th February 2013, 01:59 PM   #5
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Quote:
Originally Posted by hansibull View Post
yup, thats a bummer, I know. but do you think that changing capacitors might help anyway? A pair of 10000uF caps isn't so expencive. Is it worth a try?
Your amp may have limiting based on a 6R min load.

Big caps won't change that.
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