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So your sub is rated at 400 watts RMS and you have two amps, a 460 watt, and a 600 watt.

The sub is also 3.4 ohm and not 4, so you can expect a little more output.

So what amp do you think is the right one to use?

One more question. What type of box do you plan on putting the sub in?

Its 400 rms

What is the RMS rating on the sub?

I 2 amps, frist is a kenwood kac-7201 and its 460x1 rms into a 4 ohm load.I got a sundown sa 8 and I was wondering if this am will push it fairly nice.my second amp is a us acoustic usx-600 600x1 rms and would like to use it since it is bigger and more close to about the wattage I wanna run to it. My ? On it is that the last time I hooked it up it was puslei.g and and it was doing it on like vol.5 and I xidnt run the wires cuz it was already done in my buddies car and he was gonna buy it but it was doing that.it workdd fine in the pass,like around July it was still playing jst fine and I took it out to vet rid of my truck and put it in the garage, until I got another truck.can someone plz tel me wat could be wrong.tnks very much