only problem with the Memphis 4k...at least the older model I had, was unless you had a rediculous electrical they burned up very easily. I had 3 Kinetik 2400s on 1 of them and the power supply went up on it....had it fixed and got it back, 2 weeks later the RCA outputs went out. Got it fixed again and sold it.
I personally will never go with anything but Sundown from now on. Great customer service and the product you get is top notch