Bought a Yamaha AXV640 yesterday and a YST-SW015 Sub. The Sub has a left and right connector (plugged into the left via RCA) 30 minutes into watching Terminator 2 I hear a buzzing and a pop, the sub has blew Took this back to the shop and had it replaced with the demo model. Perfectly happy with this until I watched Insomnia last night, again a buzzing noise and a pop. That one has blew as well. I think it is worth mentioning that this demo model wasn't active it was just on display in the store In my AV room I have a laminated floor, a bookcase about 1.5" from the sub and a magazine rack about 1ft away from the sub. When it did blow I noticed the back of the sub was red hot. There is also a bit of a clump of wires coming from the back of the amp. I bought a IXOS RCA lead for the sub. I am wondering if I am going wrong anywhere with placement, etc because it seems too much of a coincedence that 2 should blow in the same day. Any advice?