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Bavarian Soundwerks' Mobile Electronics Forum
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Old 04-11-2011, 05:52 PM   #1
radarcontact
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Setting amp gains with Business CD player

Talking about setting the Business CD player to the right level before setting aftermarket amp gains

I did mine by ear. I ran the cd player volume knob up to max (endless knob, but it was a turn or two after max I'm sure). Then backed it off 4 clicks, I think. That seemed to be the loudest before clipping/audible distortion.
Anyone do anything different?

BSW guys? With all your test equipment...is there a "correct" number of clicks below max that gives cleanest AND loudest signal?

This would be good to know, then we could make a quick how-to and sticky it!
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Old 04-11-2011, 06:32 PM   #2
gergpez
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I want ot say 40 clicks...Not 100% but that is what comes to mind.
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Old 04-11-2011, 07:12 PM   #3
Bios24
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Set your gain with a volt meter, much easier and generally more accurate than by ear.

See:
http://www.carforum.net/audio/9580-p...-tutorial.html
or JL has a really good one with pictures:
http://mobile.jlaudio.com/support_pages.php?page_id=143
use the calculation at the bottom of the page to find the voltage for your amp: E = Square Root of (P x R)
http://www.the12volt.com/ohm/ohmslawcalculators.asp
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Old 04-11-2011, 08:56 PM   #4
uvoo114
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Quote:
Originally Posted by gergpez View Post
I want ot say 40 clicks...Not 100% but that is what comes to mind.
It's around there because I think I maxed out at 44 clicks with distortion and I backed off 4 clicks or so when I was setting my aftermarket amps.
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Old 04-12-2011, 10:13 AM   #5
radarcontact
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Ok so so-far we are on the same page here...basically 4 clicks away from max.

Anyone else?
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Old 04-12-2011, 10:25 AM   #6
gergpez
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Quote:
Originally Posted by Bios24 View Post
Set your gain with a volt meter, much easier and generally more accurate than by ear.

See:
http://www.carforum.net/audio/9580-p...-tutorial.html
or JL has a really good one with pictures:
http://mobile.jlaudio.com/support_pages.php?page_id=143
use the calculation at the bottom of the page to find the voltage for your amp: E = Square Root of (P x R)
http://www.the12volt.com/ohm/ohmslawcalculators.asp
Based on the JL guides, it is 75% of max volume. I want to say I set mine with 35 clicks on the dial. Its been about 2 years since I messed with it so I am a bit rusty. Max volume is either 40 or 44 clicks.
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Old 04-12-2011, 10:29 AM   #7
radarcontact
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Quote:
Originally Posted by Bios24 View Post
Set your gain with a volt meter, much easier and generally more accurate than by ear.

See:
http://www.carforum.net/audio/9580-p...-tutorial.html
or JL has a really good one with pictures:
http://mobile.jlaudio.com/support_pages.php?page_id=143
use the calculation at the bottom of the page to find the voltage for your amp: E = Square Root of (P x R)
http://www.the12volt.com/ohm/ohmslawcalculators.asp
The first one (at car forum.net) is very good! Haven't read the others yet. However, they, and all others, start with setting the head unit to the highest signal without distortion. That's the problem, and that's what this post is trying to accomplish. The "more head is better than none" theory. Or is is the "more heads are better than one" theory? Yeah, I think that's it but I definitely like the first one much better!! Lol

The only true way to set the BusCD would be to use an oscilloscope and I don't have access to one. Well, actually I do but the US Gov would throw me in jail for "borrowing" it.
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