Determine Ohm for Gain Setting

[jrwalte 10+ year member]

What's the best way to determine your ohm to place in the formula for setting your gains based off its AC voltage output with a test tone?

Do I just take the basic ohm of 4 ohm sub wired parallel is 2 ohm and speakers bridged on a 4 channel is 4 ohm? Or do I take an actual ohm measurement of the speaker wire? The ohm reading of my speaker wire for my fronts are about 3.4 ohms and my sub was around 2. Do those differences make a difference in the formula?

Thanks

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[helotaxi 5,000+ posts]

You use the nominal impedance not the measured resistance. The amp will never see the resistance that you measured, never.