jblayz1

10-16-2007, 03:29 PM

i have a question about 8ohm speakers. when setting the gains on the amp to these speakers, would you set to the speaker or amp? what i mean is, say you have 120rms 8ohm speakers and 120 x 2 @ 4ohm. would you set your gains to 120 x 8 (sqrt) = 30.9v or 120 x 2 (sqrt) = 21.9v ??

DejaWiz

10-16-2007, 04:40 PM

i have a question about 8ohm speakers. when setting the gains on the amp to these speakers, would you set to the speaker or amp? what i mean is, say you have 120rms 8ohm speakers and 120 x 2 @ 4ohm. would you set your gains to 120 x 8 (sqrt) = 30.9v or 120 x 2 (sqrt) = 21.9v ??

An amp that is rated for 2x120w rms with a 4 ohm load can not output 2x120w rms with an 8 ohm load, unless it's specifically engineered to do so. Figure about half the 4 ohm power when driving an 8 ohm load.

Square Root of (Watts * Ohms) = Output Voltage

...SQRT(60*8) = 21.9v