what freq do you use when setting your gain on amps?

[blazeplacid 10+ year member]

I have a Rockford 25 to life "75" series

Amp is great and does 2 ohm bridge.

I know the specs say not to do it but its been doing it for about 2 months with no problems.

Now since there is no rating on the 2ohm bridge I just guesstimaed about 700-800rms@ 2ohms.

The amps are very underrated the specs say like 75@4ohm or something but the birthsheet says 220per channel @4ohms.

Anyways

When im trying to find ~37.5v on the DMM what frequency am I going to get a good reading at?

I tired it before and relized that if you play it at 50hz you will get differant voltage than at 70hz.

Can someone explain?

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[spark plugs. 10+ year member]

if you're using it for bass, then 50 hz is what i normally adjust gain with