XM series amplifiers deliver big power combined with a build quality that make the amplifier suited for outdoor marine or extreme installation usage. Exile amplifier design features coated 5 layer epoxy circuit boards and stainless steel throughout the amplifier. XM heat sinks feature grams of aluminum per millimeter making it second to none in heat dissipation. These amplifiers are built rock solid and packed with features + tons of power (210W x 4 @ 2 ohms). Check out all the technical specs on the tab below. It definitely tells a detailed story.