Gain

[01tundraon6s 10+ year member]

We just set the gain on my brothers BOSS amp using the RMS chart from

http://i53.photobucket.com/albums/g42/Krannyman92/rmschartpm5.jpg

Does this mean we can put the head unit volume all the way up and it wont clip?

I dont really understand exactly what setting the gain does.

Even though his amp and subs match exact rms at 4 ohm the gain we had to set below half.

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[dB-SPL 10+ year member]

No. Even the head unit itself has a point of clipping. If you don't have a 'scope, your best bet is to set it at 75%-80% of max volume and go from there. Gain is a sensitivity. It matches your amplifier to your head unit so that you're able to use your full volume scale. Example: If your head unit goes to 50 I wouldn't go above 38. If you set your gain too high, it will reach full power before level 38 which in turn will create a clip in the sound wave if taken too far. If it's set too low, your amp will never make full power at the given volume level (38).