wiring after market speakers to an amp.

[Domosofly]

So if i wanted to hook up another amp how would i got about doing that? The amp would be a mono amp that supplies a 4 ohm load with 300 watts RMS, i would connect it to a single 12 inch sub woofer. Would i use a distribution block and just split 0 to 4 gauge, or is there a better way. And would having two amps end up dimming my lights and putting alot of strain on my alternator? I also have a amp running to my 4 door speakers, that delivers 50 watts.

Here are the amps.
1) Alpine MRP-M500
2) Alpine MRP-F300

thanks.