I don't think the M2200's have enough cooling to properly power a 4 ohm speaker. looking at the photos, powering a 4 ohm speaker at a high volume requires a considerable amount of power, in the form of current.. if you like to listen to your music at a high volume, you will have to pay to play.. You might be able to modify the outlaw amps with some aluminum heat sinks, if you can dissipate enough heat from the unit it might be able to provide the power you are looking for.