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i have a sony xplod xm-280gtx amp and i need to know if anybody out there knows what the little black twistie knobby things right after the speaker imputs and specifically the **** right before the low pass filter toggle switch, cause every time i go to tweak it and then turn off the actual stereo system from the head unit (i have a factoy head unit) the speaker still hits and pretty hard might i add to the point where it is a loud vibrating sound eminating from the speaker. if anybody knows what i am talking about and can help me out i would greatly appreciate it. and also if anyone can explain all the controls on the amp that would also help
thanx

 
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sorry forgot to add this: i have a 12" sony xplod sub rated at 1200w if that helps

 
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The ***** are usually gain and passover frequency adjustments. These will help tune the system.

Your issue has nothing to do w/ the settings. It has to do w/ the setup.

Basically you don't have an aftermarket radio w/ a remote turn on lead. This wire is on only if the radio is on, and off if the radio is off. Generally you hook up this wire to the remote spade on the amplifier itself.

Since you need a way to turn the amp on and off you hook up the remote wire to the same lead that is triggered by your ignition. The same wire that allows the radio to power up. This way whenever the car is on the radio can come on and the amp will be on too.

The catch is when the ignition is on the radio CAN turn on, but the amp will ALWAYS be on. The amp isn't controlled directly from the radio.

Now you can get into trouble just like you are saying. The issue is when the car is on, so the amp is on. Now you turn off the radio but the amp and car are still on. Since the radio is off it isn't sending the amp any signal. The amp is on but doesn't know what to play. Therefor it just plays garbage.

The fix is to get an aftermarket HU or to never turn the factory radio all the way off.

 
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That **** is for the frequesncy i think, look in your serves manual, there is a graph, on mine if you turn it one side the bass gets very distorted. i keep it around 40 or something, sound crisp

 
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i also forgot to mention that i bought it used from a co worker so i dont have any of the booklets that would've come with it

 
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There is a gain, usually 0.2 or 0.5 volts or so to anywhere from 2.0, 4.0, or 5.0 volts. This is used to match the volume of the amp to the volume controls on the HU.

The other ***** can be the crossover. This sets what freqs the sub plays. It will usually go from 45hz to 125hz. Basically the sub will play from that freq and down. The lower the number the lower the bass will sound.