subwoofers

i got 2 questions. and im sorry that i dont have more information.. but if nessacary ill get it all.

1. this is in a 94 jeep cherokee. i have the amp and subs all installed.  but even after i shut uff the care and take the key out  the amp doesnt shut off.  on the head unit i saw 2 wires that i thought i could us. one labled ACC and the other was label 12Volt.  right now i have the remote power hooked up to the 12volt.  i thought i was sopposed to hook it up the ACC line but the amp doesnt power on at all. any one got any ideas  on what i can do  or try..

2. also the person im setting up for doesnt have any manuals so i cant check all the specs.. but when he bought he sadi the spakers should be able to handle the amp.  but when ever i turn up bass  it starts to make almost like a slapping noise.. as if you had your hand on the woofer while it was going.. its fine when i dont trun it up.. but  the amp is alpine and he spent lose to a grand on it  and my doodiety fast and the furious crap subs hit far harder then  these ones do.  so that doesnt seem right..

id appreciate any help.

thanks

1.  If you're hooking this up to a factory system, you should use the accessory lead for the amp turn on- that way the amp will only be on when the key is turned.  As it is now, the amp is constantly draining the battery.  You need to test the wire you connect this to with a multimeter and make sure it is infact an accessory lead, and has 12 volts only when the key is turned.  If you're hooking this up to an aftermarket deck, use the remote turn on wire in the harness.

2.  It sounds like you're letting the subs "bottom out" and reach their mechanical limits.  This can quickly destroy them.  You may have the gain set wrong (do a search here), or simply an equipment mismatch.  If you're using a factory deck, are you using a line out converter to get signal instead of the high level inputs on the deck- you should be.  Another possibility is the subs are in an enclosure way too big.  What kind of box are they in (sealed/ported)?  Is it built to factory spec, or were the subs just thrown into a premade box (not necessarily to the size they call for)?

That 600 watts is at 2 ohms.  I can't find any specs on your subs, are the dual or single voice coil?  How many ohms (2 or 4 ohms per coil)?  What is their rms power handling rating (forget max)?  How do you have them wired?

Like I said above, use a meter to test for the accessory wire.