Setting A 2ch Bridge Amp

[ISO]

damn this makes me feel real dumb..lol. i'll find you a link now. thanks for the help by the way

Dude don't start to feel dumb.

Hell I might be hitting Vet status and as nice as seperate gain controls are I still have a hard time when I need to bridge an amp like that.

[PUNKYOU007]

thanks that deff made me feel better. and i was just in the shower and was thinking thats what i should try. thanks ill try that when i get a chance. but for now im off to go see Friday the 13th....

[ISO]

Well good luck and let me know how it works out.

[Boon]

Do you have a 2-channel o-scope? If yes set the display type to ADD or SUM then connect one probe to the left channel and 1 probe to the right but backwards then adjust the gains until you get a perfectly flat line on the scope. Turn down the v/div so you know it's really really close. That way you know the channels are perfectly equal.

This won't work if the amp/source doesn't have perfect phasing between the channels but it should be pretty damn close.

[ISO]

Do you have a 2-channel o-scope? If yes set the display type to ADD or SUM then connect one probe to the left channel and 1 probe to the right but backwards then adjust the gains until you get a perfectly flat line on the scope. Turn down the v/div so you know it's really really close. That way you know the channels are perfectly equal. This won't work if the amp/source doesn't have perfect phasing between the channels but it should be pretty damn close.

Ya that is a very,very important detail.

When you feel like your done use your DMM again with the speakers unhooked and check your right and left channels with the DMM again.

Its really important that both channels are putting out the same amount of AC voltage so adjust your gains accordingly. If the scope says 25.00 AC volts on the left channel, Then you need to make sure the right channel is within 3 to 5 tenths plus or minus.

Something like this:

If the left does 25.00 volts clean, then the right needs to be somewhere between 24.70 to 25.20 or left can be 25.00 volts and the right can be 24.90.

You will find out what your numbers are after you scope it.( the numbers I used are examples only)

Now that you have done the final part you should be good to go.

Hook your subs up and let them pound.

Little tidbit of info on some RF amps. There is a really good chance that the RF amps won't have a flat frequency response. Most likely there will be a small hump at 45 Hertz. (Even with the Punch Bass turned all the way down.)

I highly recommend setting your gains with a test tone disc playing 45 Hertz and make sure you use your repeat track button on your H/U so it doesn't change frequencies on you by accident.(I usually use a 50 hertz test tone on normal amps)

This is were I buy my Test tone discs. www.termpro.com

Direct link to the disc:

http://www.termpro.com/storefront/index.asp?Page=13

Edited February 15, 2009 by ISO