Hello all! I am thinking on trading my mint sda 1c for rta-15tl. I love these sda 1c, they are amazing. However, I just got a non-common ground amp that I like a lot. The manf. of the amp, said this:" may be used as common ground amp if the two negative (black) terminals are strapped (connected using a piece of wire) together at the output of the amplifier". Any ideas? I really like the sda 1c's, but the guy I got the amp from said he had rta-15tl a while back, and he love the amp and the rta-15tl. What to do?