I was looking at an Arc Audio amp to power an Adire Brahma. 1st is that a good choice or should I go with something else? Their are 2 amps I was lookin at the KAR 900.1 and the 1500 XXK. One of them is 900 watts in a 1 ohm load the other is 900 watts in a 4 ohm load. Which would be better for the sub a 1 ohm load or a 4 ohm load or would it matter since the sub is dual 2 ohm and can be used for both 4 ohm and 1 ohm operation?