I have an ampeg SJ-12t and a THD Univalve. The speaker in the ampeg is hard wired to the amp, but the speaker itself has four tabs for connection. 2 (+) and 2 (-). With the power off on the ampeg, could I connect the the speaker output of the Univalve to the remaining two tabs of the ampeg speaker. I was wondering if there would be any harm to the ampeg if I left the connection on during use of the ampeg, of course the two amps would not be used simultainiously- one or the other. Good idea or bad? Thanks in advance.