Setting gain on 2 channel amp with DMM

[Patthehat033 10+ year member]

How exactly do you set the gain with a DMM on a 2 channel amp?

For example, say I am looking to have it output 30.0 Volts. Should I be getting 30V out of each channel or only 15V out of each? I would suppose it would be 15V but I am not positive.

Click to read more...

 

[maylar 10+ year member]

Do you want 30V each channel or bridged?

 

[Patthehat033 10+ year member]

I want 30v all together and I am running 2 channels not bridged together.

 

[keep_hope_alive Premium Member]

show us the math you used to get to that number

P = V^2 / Z

P = 30^2 / 4

P = 225 W RMS

112.5W RMS x 2?

112.5 = V^2 / 4

V^2 = 112.5 * 4

V^2 = 450

V = SQRT(480) = 21.2 VAC

because voltage is squared, the relationship is not linear and you can't assume that if you need 30VAC for the combined wattage that you need 15VAC for half that power.

 

[JoshC 10+ year member]

Just tell us how much RMS you are looking for so we can do the math, so you want how much rms out of each channel?

 

[keep_hope_alive Premium Member]

^^^... and give us the make/model of the amp as well as the impedance of the speakers

 

[Patthehat033 10+ year member]

Haha okay! I see what you saying. Well my brothers subs can only handle about 300 watts rms and my amp which is a t5002 is rated at 75x2 watts at 4 ohms, 150x2 at 2 ohms, and for later on when I get my subs it can do 250x2 at 2 ohms bridged. It's birthsheet is 1053wrms at 2 ohms bridged.

His speakers are svc 4 ohm. And I am going to try and run about 75x2 @ 4 ohms right now. So I will need 17.3 volts give or take at each channel correct?

Also where is a good place to get a 60hz tone?