JL audio 300/4 sucessfull repair, but questions... - diyAudio
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Old 14th June 2010, 06:03 PM   #1
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Default JL audio 300/4 sucessfull repair, but questions...

I've had a JL 300/4 sitting on the shelf for a while now. After some research on here, I decided to dig into it's low ohm issue. One output transistor tested low on the board and bad once I pulled it, it was replaced.

I was successful in solving the issue, and the amp now has what seems to be normal output.

I'm driving a set of 3-way MB quart Q series speakers. While this amp was down I was using an older 4 channel Kenwood amp that was loud, but not necessarily clear. Deck is a new Alpine CDA-9886 with 4V preouts.

Last night I used JL's instructions to set the gain. With no processing on the deck and the volume at 3/4 I was looking for 17.3V per channel. I could achieve this on either high or low input settings.

Question is this. It's very clear sounding, even near full volume on the deck, the issue is I can turn it up to full volume and it really could stand to be louder. I have ran these speakers with this amp before (but not this deck) and I do remember it being able to drown out the noise from my diesel.

Anything I should be looking at? Some other component in the amp, bi-wiring, bridging a side to each pair of channels maybe?

Sorry for the long post

Last edited by monkeyevil; 14th June 2010 at 06:33 PM.
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Old 14th June 2010, 10:14 PM   #2
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I know of no one that was ever satisfied with the gain set as JL suggests. That doesn't mean that it's not a proper way to set the gains. Most people want to be able to drive their amps harder than they can with the gains set that way.
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Old 15th June 2010, 02:10 AM   #3
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Quote:
Originally Posted by Perry Babin View Post
I know of no one that was ever satisfied with the gain set as JL suggests. That doesn't mean that it's not a proper way to set the gains. Most people want to be able to drive their amps harder than they can with the gains set that way.
I ended up bridging each channel, helps a lot.
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