Hi. I'm brand new to the home theater scene and I have a couple of questions. First, I'll tell ya what I have. I received the RCA RT2390 as a Christmas gift. It comes with a "powered" sub, but the power comes from the receiver, not its own built in amp. So, ok. The bass sounds fine, but I'm not getting those loud explosions that I think I should be getting. When I get down by the sub during a bassy part, I can see it moving really fast, but I just can’t hear it very well. Should I put it somewhere else? It's just by the entertainment center now close to the wall, but right next to it is a huge entryway into the kitchen. Also, I was wondering about toslink cable. I'm looking to buy one on eBay and I don’t have a ton of money to spend, so would one for about 5 bucks work just fine? I live out in the middle of nowhere so I can’t just go to an audio/video store and pick one up. Ok, one more question. It seems to have 75w to the surround channels, 100w to the center and 100w to the sub. Could I later upgrade to better speakers but still keep the receiver? Thanks in advance.