Trying to hook up a good sounding system on my motorcycle using 4 100 Watt RMS 5.25 speakers

Here are my amp specs:



I have a Blaupunkt 2 channel power amp model "Amp 750" that is 750 watts. The RMS rating is 160W x2 at 4 ohms



Amplifier Class: AB

No of channel: 2/1 Channel

Max. Output Power: 750W x 2

RMS Power (4 Ohms): 160W x 2

RMS Power (2 Ohms): 325W x 2

Frequency Response: 10Hz - 45Hz

Signal-To- Noise Ratio: 90dB

Voltage Supply: 11 - 16V DC

Gain Adjust: 150mV-6V

Total Harmonic Distortion: 0.05%

RCA Input: 2 Channel

Crossover Frequency: 50Hz - 400Hz

Crossover Slope (dB/oct): 8-10dB/oct

Fuse: 30A x 1

Dimension: 11.8 x 7.5 x 2.1in









I want to maintain 4 ohms output problem IS if I go Parallel output will be only 2 OHM and output too high 162



If I go SERIES then output changes to EIGHT OHMS and output goes to 40W too LOW



Is there any way to do this in Series/Parallel to maintain 4 OHM and only halve the RMS per channel to 80 which would be perfect or am I doomed to Series only wiring?