Setting 4 channel amp gains with DMM

[Landshark77]

I'm looking to set my gains using a DMM on my FSD 125.4 (4 channel amp).

Channels 1/2 are 4 ohm tweeters and channel 3/4 are 2 ohm mids.

When using the formula to calculate voltage do I make that calculation for 4 ohm or 2 ohm and what watts would I use?

125W x 4 CH @ 4 ohms stereo

200W x 2 CH @ 2 ohms stereo

And this is the formula I found:

Square root of RMS X Ohms=Voltage

Do I make the calculation for channels 1/2 (Square root of (125 x 4) and 3/4 (square root of (200 x 2)

Click to read more...

 

[porkcereal]

https://jlaudio.zendesk.com/hc/en-us/articles/204374120-Amplifier-Level-Setting-Guide

At the bottom is a voltage chart listing what you should need.

 

[Landshark77]

https://jlaudio.zendesk.com/hc/en-us/articles/204374120-Amplifier-Level-Setting-GuideAt the bottom is a voltage chart listing what you should need.

Do I measure the whole amp as 2 or 4 ohm? Or measure each channel seperatly, 2 ohm on the 2 ohm channels and 4 on the 4 ohm channels.

 

[porkcereal]

Each channel.

Sent from my SAMSUNG-SM-G935A using Tapatalk