heeeey , I have a question. brbrI have 4 15" subs and 2 jbl 1200's 2 15's per amp. its all in one big 12 cubed ported enclosure.brbrI was told with the jbl amps i would have to set output exactly the same as each other. and to do that use a volt meter, and adjust the gains, so there both equal.I hooked up my digital volt meter to the outputs of each amp seperatly and the voltage is of course AC? so now im stuck? brbranyone got any idea on how i could acheive a balanced system????
Replies (6)
swez on 05/20/2004 10:12:43
There is a technique used to do as you are asking. Here's a link to a site that explains what you need, how to do it and what results to expect.
http://www.bcae1.com/measpwr.htm THINK
If you don't have a tone generator (most don't) a test tone CD will do. The O-scope is good for establishing maximum gain before waveform distortion ("CLIPPING") becomes problematic. The minimum items you can use to get them pretty close, is an AC voltmeter and a dummy load resistor that can take the power these amps deliver.
The thing to match, is voltage output number of each amp off the dummy load. Good luck finding a dummy load that can take 1200+ watts of power though.
Hope that helps,
Swez
UKinstaller on 05/20/2004 12:29:51
just out of curiosity, what does "brbrl" stand for??
-UK
cplkittle on 05/20/2004 17:30:53
brbrl is a glitch that occurs when one edits or changes what is origionally written in a post.
swez on 05/20/2004 18:55:09
Some get that, others do not when editing. It seems the Golds have dodged that puck, but others have to contend with it for now.
Swez
puttputtofdoom on 05/27/2004 13:24:54
thanx for the info guys.
I have one more question, Do I need a dummy load resistor or can I just turn the subs up to or near audiuble clipping the test the out puts with a volt meter.
I have a couple test tone cd's and if I put one track on repeat its should work right??
swez on 05/27/2004 16:22:14
May get by reading voltage off the subs with test tones. The impedance of the subs should be pretty close to same value so voltafe would be pretty accurate. Dummy loads are better as these are often calibrated and non-inductive. The value of a non-inductive load, will not change with frequency. (subs will)
Yes, repeat the same track until voltage matching is achieved. The voltage reardings (AC of coarse) will be different at different tones. Loudest tones will be in the 50-75 Hz., range.
Swez
Replies (6)
swez on 05/20/2004 10:12:43
There is a technique used to do as you are asking. Here's a link to a site that explains what you need, how to do it and what results to expect.
http://www.bcae1.com/measpwr.htm THINK
If you don't have a tone generator (most don't) a test tone CD will do. The O-scope is good for establishing maximum gain before waveform distortion ("CLIPPING") becomes problematic. The minimum items you can use to get them pretty close, is an AC voltmeter and a dummy load resistor that can take the power these amps deliver.
The thing to match, is voltage output number of each amp off the dummy load. Good luck finding a dummy load that can take 1200+ watts of power though.
Hope that helps,
Swez
UKinstaller on 05/20/2004 12:29:51
just out of curiosity, what does "brbrl" stand for??
-UK
cplkittle on 05/20/2004 17:30:53
brbrl is a glitch that occurs when one edits or changes what is origionally written in a post.
swez on 05/20/2004 18:55:09
Some get that, others do not when editing. It seems the Golds have dodged that puck, but others have to contend with it for now.
Swez
puttputtofdoom on 05/27/2004 13:24:54
thanx for the info guys.
I have one more question, Do I need a dummy load resistor or can I just turn the subs up to or near audiuble clipping the test the out puts with a volt meter.
I have a couple test tone cd's and if I put one track on repeat its should work right??
swez on 05/27/2004 16:22:14
May get by reading voltage off the subs with test tones. The impedance of the subs should be pretty close to same value so voltafe would be pretty accurate. Dummy loads are better as these are often calibrated and non-inductive. The value of a non-inductive load, will not change with frequency. (subs will)
Yes, repeat the same track until voltage matching is achieved. The voltage reardings (AC of coarse) will be different at different tones. Loudest tones will be in the 50-75 Hz., range.
Swez
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