Just got my new (used) Hsu VTF-2 from a HTF member. It appears to be in good shape, but I cannot get it to work. I tried a subwoofer cable straight from the sub port (reciever) to the RCA port on the sub. Nothing. Not even a hum. I tried cables running from speaker output to sub, then onwards to speakers. Un-listenable, it was all sub, with huge electronic noise whenever a certain freq was reached. I had to disconnect it because I was afraid it would hurt the unit. I think I have my reciever settings correct. Any ideas. I was really looking forward to this thing, but can't seem to get it operational.