| amp that can amplify all of your speakers. Using the power out of the head unit will not sound very good. If you are not using any rear speakers than you basically have three options: 1) Buy a 4 channel amp and bridge channels 3&4 for the sub. You will have to experiment if the head unit or the amp has a better crossover. 2) Purchase two smaller amps. One Class A/B amp for the front speakers (75 watts min per channel @ 4 ohms), and a class D mono block amp for the subs (min 200 watts @ 4 ohms). 3) Purchase a single 5 channel amp (channels 1-4 class A/B 50 watts min with a single channel Class D section for the sub). Bridge 4 channels down to 2 and use that for your front speakers and use the mono block section for your sub.
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