The gain on your amp is used to match input voltage from your source unit. It needs to be set to allow your amplifier to work at its best. If your Source is putting out 4 volts, thats where your amp gain needs to be.
There are a few different methods for setting your gain, The least favorable of which is by ear. Look into setting it with a multimeter, your easiest option.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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