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how much money do you have to play with? typically, what you want is something that has more power than your max rating on your speakers...reason why is because at a volume that requires power that your amp doesnt have, you get a massive amount of distortion, even though your speakers can handle it...that will damage both your speakers and your fry your amp. if you have 75W RMS and 150W Max speakers at 4ohm, I would get an amplifier that has 200W per channel at 4ohm (200W x 4 = 50W per channel which is not nearly what you need for even your RMS rating)
also, dont run your 4ohm speakers at 2ohm...you will damage them...but one thing you can do, is double the length of the wire if your running from the amp at 2ohm and at the speaker, you will probably be around 4ohm...you will have to use a multimeter for that though just to be safe...i think its a multimeter at least...
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