hey what's the formula to set the gain? I have a digital multimeter. Also, anyone know where I can download a test tone CD to do this?

 

Formula= sqrt(impedence * wrms)

Realmofexcursion has plenty of downloadable test tones. Remember to only use a tone at 0 Db.

 

is it the total RMS wattage, or per channel?

 

Well, it depends on the setup. Are you bridging the channels, running more than one sub?

 

i'm just listening to two front speakers, no rears no subs

 

i just set gains by ear...

 

http://www.soundsolutionsaudio.com/f...showtopic=3704

just set each channel to the voltage you get after you do the formula.

 

ok, the website says to never set the volume on your head unit above 75% of the maximum volume. Why is that? I know that if you turn the gain on the amp all the way up, the amp will overheat. But a head unit doesn't overheat right?

 

most head units might clip when pushed beyond 75% volume. so people just made it a rule of thumb not to go past 75%, although an oscilloscope can really tell you if it's clipping at that level or not.

 

If my gains are below about 75% then i have to turn up the volume over half way to even hear my subs..... my gain is like 90% up now

 

yikes my gain is at about 35-40% and I have my sub control on +2 out of +6.

 

must me those dam* RF amps then! O well when it goes i'll get somethin better