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Make sure you are wiring the sub to the correct ohm's. Some amps have a protective feature that will send them into protect mode if they do not since the right ohm load. If the sub is wired correctly double check your ground wire on the amplifier, and if that if also fine then your amp will need serviced.
Your problem is probably that your amp is starving for power. I have a few questions.
1.What size wire are you using for power and ground on the amp?
2.Whats the impedance of your Sub-woofer?
3. How long are the power wire and ground wires.
For starters... I'm going to guess that you usually lose the subwoofer at lower frequencies. The lower the frequency the more power it requires to drive the sub. You also might want to check if you are running the amp bridged but mainly if your amp is trying to push a 50hz tone at high volume, If your alternator cannot provide the required Amperage. The amp will cut out. A capacitor can improve this. Run a power wire from the battery to the positive terminal of the capacitor then from that same terminal run a positive wire to the amp. Connect the ground on the capacitor directly to the body of the car...make sure to scrape off any paint to make a good ground connection.
check the ground to the amp. then check the remote wire. make sure u have the sub option on ur stereo turned on. if all is wired up correct an u do not have the subs turned on in ur stereo settings then the stereo will not send power through the remote wire an therfore your amp will not power on.
do you have the right size ground wire, relative to your power wire?
If your ground is smaller when you turn it up there is alot of power it needs an exit and if the wire is too small it travels elsewhere maybe your rca, causing your amp to protect.
ok here is how it goes power wire from the battery all the way to amp..then ground wire from amp to a good ground on car then the remote wire which you have to run from the amp to the back of your stereo which in most cases is blue then hook subs from the sub box to the amp
Make sure you got a good ground. do not ground on painted surfaces! If
you got power from battery, check the remote wire running to cd player.
Hook up remote blue wire with the one for cd player. If you still have
a problem and the fuse is good, then the amp is fried
The problem would be if you had it switched around. The 1200W subwoofer only means that it can handle 1200w of power the 1000w amp means that it can deliver 1000w of power. What you may have is an impedance mismatch. My question is what is the resistance rating on the sub woofer and what is the minimum resistance rating of the amplifier. These are actully the important issues at hand.
the rating of the subwoofer resistance in Ohms should never be lower then the minimum resistance rating on the amplifier. in fact the resistance rating on the amp should match the resistance rating on the subwoofer.