Mono means one channel, which is for subwoffers. You can do a dual channel amp as long as you understand what that means. If you connect two speakers to one channel then the speakers will play the same thing. That may seam fine, but music has panning and sounds sometimes only play in one particular channel. you could hook up the back two speakers to one 400 watt channel and the front two to another 400 channel, but the front left and rear left will playing the same thing and the front right and rear right will play the same thing. its kind of like listening to headphones where both sides play only the left speaker. what ever the right receives will be completely left out.
that's why a 4 channel amp is used so each speaker gets a channel and each speaker gets the intended source. Also you cannot adjust the volume on all four speakers, only on two at a time. This means if the back speakers are louder than the fronts, you cant do anything about it. now if you really dont want to buy a 4 channel amp or you dont care about not hearing everything in a song, you can buy a two channel, but i would not recommend it.
You may want to consider buying a cheap 4 channel that says 1,600 watts or something. if its cheap, it will play considerably less watts, and if plays more watts than what your speakers can handle, you can always turn down the level (or power) the amp puts out to match your speakers.
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