Stereo System Question...

Hopefully someone can help me out with this situation. I have an Alpine V12 MRV-F400 amp and the specs on it is:

Power Output
RMS Power(at 12 V, 20 - 20k Hz)
Per Channel into 4 W ...................... 40W x 4 (0.08% THD)
Per Channel into 2W ......................... 50W x 4 (0.3% THD)
Bridged 2 Channel into 4W ........... 100W x 2 (0.3% THD)
Dynamic Power(at 14.4V, 20 - 20k Hz)
Per Channel into 4 W ...................... 60W x 4 (0.08% THD)
Per Channel into 2W ......................... 80W x 4 (0.3% THD)
Bridged 2 Channel into 4W ........... 160W x 2 (0.3% THD)
Frequency response ..................... 10 Hz to 50 kHz (+0, -1 dB)
Signal-to-Noise Ratio .. 100 dBA(referenced to rated power)
Input Sensitivity (for rated power)
Line Inputs .......................... 200mV-4V (500mV at detent)
.................................................. .......................
(1.0V at center)
Slew Factor .................................................. ..........
Greater than 5
Input impedance .................................................. .........
10k ohms
Speaker Impedance
.................................................. ......................
.......................... 4 or 2 ohms (stereo) or 4 ohms (bridged)
Dividing Network Frequency and Slope ........... 50 ~ 200 Hz
.................................................. .................. 12 dB/
Oct. Slope
Power Requirements .............. 11-16V DC (Negative ground)
Dimensions(WxHxD) ............................... 9-7/16"x2-1/16"x13"
.................................................. ....................
(240x53x330mm)
Weight............................................ ......................8lb
13 oz.(4.0kg)

I have a Toyota Pick-up and I am running my two front speakers to channel 1/2. I have two 10" Punch XLC RFP2410 4oms speakers in tubes, but I don't know the best way to hook those up to the amp. I have been reading about Series and Parallel wiring. If I Series these speakers together, I will only get a 8ohm out of them. If I Parallel these speakers, I will get 2ohm out of them. But it looks like the amp can only handle a bridge to 4ohms. Right now I have them both wired into the 3/4 channel and not bridged. I don't want to go buy an amp or different speakers. What do you suggest I do to get the best performance?

You suggestions would be greatly appreciated... Thanks