MRV-F357 ohms question

I currenlty have an Infinity kappa 10" dvq sub wired parralell to my Alpine MRVF357 Amp.  the amp seems to overheat quite fast.  am i wiring my sub adequately or what.  here is the spec sheet from alpine.  please let me know the

MRV-F357

Per channel into 4 ohms (CH-1 – CH-4) ..... 50W, 0.08% THD

Per channel into 2 ohms (CH-1 – CH-4) ...... 60W, 0.3% THD

Bridged into 4 ohms (CH-1 – CH-4) .......... 120W, 0.3% THD

4 ohms (CH-5) ......................................... 150W, 0.3% THD

MRV-F357

Per channel into 4 ohms (CH-1 – CH-4) ........................ 90W

Bridged into 4 ohms (CH-1 – CH-4) ............................ 240W

4 ohms (CH-5) ........................................................... 300W

best way to wire and if i need to put it into series or not?  thanks 

You'll get most watts through channel 5 as long as your deck has a sub preout and you select "5" for your amp input setting.  At 12 volts, the amp's 5th channel is rated at 100 watts into 4 ohms;  with 14.4 volts, it's 150 watts into 4 ohms.

With your load at 8 ohms the power output decreases by a factor of times two.  So the amp will output from 50 to 75 watts into the series-wired 8 ohm load.  (The output I told you in the previous post was based on the numbers you listed, which were first at 14.4 volts and second as "max".  We'll throw out that "max" number...). 

You need as much as you can get from this amp so you can see how using a sub capable of 4 ohms will get you the most this amp can deliver.  You've been pushing a 2 ohm load onto it and it's been heating up quickly.  This will kill an amp.  What you're getting now as far as power output is a non-issue because the amp will not tolerate such a low impedance load for very long.