As with most amps, it is very possible to set your gain too high. I had my gain set to 1/4 up on my Alpine PDX-4 and sometimes I had channels dropping when pushing my 6.5's. In fact, I had to have one of my JL C5-650s repaired as a result of pushing too hard at 1/4 gain with that Alpine amp. Solution: set the gain all the way down.
Why set the gain all the way down? It relates to the head unit. My RCA's are coming from a Pioneer AVH-P4400 preamp output and that means: 4volt RCA's. I don't know everything about that Alpine, some of you might, but I am pretty sure that a gain set all the way down would be perfect for a 5volt RCA connection. So I am playing it safe because sometimes I like to crank my system all the way up w/ crossovers set to 80. My 1000/1 is set exactly to the 3/4 volume voltage per JL's instructions (w/ a 12w7), so cranked all way up, my entire system is generally still out of the red zone. Another consideration is that my JL 6.5's are rated @ 75rms (the Alpine @ 100rms). Why press my luck?
Why set the gain all the way down? It relates to the head unit. My RCA's are coming from a Pioneer AVH-P4400 preamp output and that means: 4volt RCA's. I don't know everything about that Alpine, some of you might, but I am pretty sure that a gain set all the way down would be perfect for a 5volt RCA connection. So I am playing it safe because sometimes I like to crank my system all the way up w/ crossovers set to 80. My 1000/1 is set exactly to the 3/4 volume voltage per JL's instructions (w/ a 12w7), so cranked all way up, my entire system is generally still out of the red zone. Another consideration is that my JL 6.5's are rated @ 75rms (the Alpine @ 100rms). Why press my luck?
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