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If you have over driven the amp by playing it real loud with the bass control turned up, it is very possible that you have toasted the output stages of amp.
Every time you boost a tone control by 3 db you have doubled the output power at that frequency. So if you are "coasting" along at a nominal 75 watts, the moment you boost the bass by 3 db the amp has to put out 150 watts at that low frequency.. Go to +6db and now the poor amp has to kick out 300 watts! And so on.
Rule of thumb - you never use your tone controls at very loud levels. Tone controls are there to compensate for the poor frequency response of the human ear at low volume levels - the Fletcher Munsen effect. At low volumes our hearing with the lows and high frequencies so when you play something at low volume you boost up the bass and treble to compensate for poor hearing. At loud volumes our ears respond properly.
a crossover cuts the certain tones out of the sound.example: the high side cuts out low and mid tones,or the mid side cuts out high and low. The only problems this could be is that the crossover is not set right or not wired right. These speakers should be plugged into the high side of the crossover. If wired right and set right then your crossover is no good.
You need a bigger amp and make sure its a two channel. Four and five channel amps are for mids and highs. If you want real bass get a two channel. If you dont want to buy a bigger amp, Go get a capacitor. It acts like a battery charge storage for when your sub needs to hit those real low notes. It takes a lot of power. Also if you get a capacitor your altinater that charges your battery will not have to work so hard keeping your battery charged, Thus not wearing out your altinater and not having to replace it so soon because it will happen.
Another quick fix is turning your gain down. I turn my gain up half way, maybe a little past half way. You might not get the bass hitting as hard but at least it wont shut off on you.
You may have a problem with the power source feeding the amp. You need to check the voltage across the amplifier's B+ and ground terminals when the amp is playing/cutting off. If it's dropping below ~11 volts, you need to determine why it's dropping so low.
The Amp stays on because you have a constant 12V to the Remote. If your stereo remote is no longer working then run a wire from a 12 volt source that turns on and off with your ignition something like your radio fuse in the vehicle fuse box. As far as the Bass Knob if it is connected properly and still not working check the line for wire kinks or cuts that may have happened during installation if you cant find any problems you can get a universal bass knob that plugs via your RCA cables for under 20 bucks. Hope this gives u some ideas.