Re: swapped out cd players now getting high pass through...
This is very easy...just unplug the rca cables out of the back of the deck, and plug them into the "subwoofer" output. On some alpine decks this is on a "pigtail" wire that extends from the deck. Once this is connected to the right output, you can control the subwoofer level from the volume knob by pressing it inwards.
Also.... your amplifier should have a low pass filter, it should be on a switch marked "LPF". Make sure this is switched on.
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Does you car volume get lower when you stop. If not sounds like an internal issue. No sound at all my brother hooked his up and when he switched to tuner everything would go through the subs but you would not know it sounded like his 6x9s no bass. was a wiring issue. I dont know if this helped or not.
Remove the face, and trimring plastic. There are slots on either side that you put the Alpine unlocking keys into (came with your headunit new) then slide the chassis out. If you don't have keys - you can use a small allen wrench - or buy them at best buy etc. A local alpine dealer will probably let you borrow his keys as a good business practice.
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The Alpine has two tigger wires when it turns on. One is an AMP TURN ON wire (blue/white) and a PWR ANT wire (blue) and that wire only comes on when using the radio or an optional HD radio unit ... When it was installed/connected . someone hooked your amp turn on wires for your "full range amps" to the PWR ANT wire. And the sub amp trigger is either hooked correctly to the AMP TURN ON WIRE or somewhere else, it probably shouldn't be... Check it. Amp triggers should all be to the blue/white wire from your alpine. Warning: Alpine trigger wires, are very easy to mess up they supply a very limited amount of power.