I have a dual channel amp & 1 single voice coil sub, & i have the sub bridged and my amp gets really hot, why?

Question

the amplifier is a dual channel kenwood kac-728S 600 watt, the subwoofer is a 12" kenwood kfc-w3011, the sub is a single voice coil, and i have it bridged to the amp, and after about 5 minutes of running the amp gets realllllly hot, and im not sure why.

Answer 1

test the ohm of your sub with a dmm to see if its blown it should read like 3.7 or 3.8

Answer 2

it also depends on the guage of your wires...the smaller you wire(IE 20guage) the harder it is to push that amount of power threw compaired to(ie 10 guage) it is much easer with 10 guage becuase it is bigger wire.

Answer 3

even though its "built with MOSFET-switching power supplies and oversized capacitors for fast response, maximum output, and cooler operating temperatures" you don't have a good match

you need an amp with about 400watts RMS @ 4ohms

your amp has 300watts RMS @ 2ohms (as a rule when you go from 4ohms to 2ohms the wattage doubles), so you are sending about 150watts RMS to the sub and that has the amp working overtime trying to push the sub (you are about 250watts RMS short)

if you keep it setup like that you WILL damage the sub and you COULD fry the amp

sub specs=

Subwoofer Impedance 4Ω x 1

Sensitivity 90dB/W/m

Frequency Response 25Hz ~ 800Hz

Peak Input Power 1200W

Rated Input Power 400W

amp specs=

300 watts x 1 in bridged mode

150 watts x 2 at 2 ohms

2-ohm stable in stereo