I'm a long-time lurker here. I tried searching the forums for this info, but couldn't find exactly what I needed, so I figured I would post a new thread. Background: I own a PA that I use for a cover band, mostly in small to medium sized venues. We mic up most of the band, including Kick and Bass. Where I am located, most of the medium to large bars have house-sound, so no need for anything too large/powerful. Right now I'm using an IPR-1600 as my power-amp. One side is powering two mains. The other side is currently powering one PV118 sub. The sub is 400W program, and according to Peavey's Specs, I'm running 300 Watts at 8ohm from my power-amp, which seems pretty good. Here is the spec sheet: http://www.peavey.com/assets/literature/specs/116949_11719.pdf I want/need to add a second sub. Question: Will the two subs be underpowered if I run both off of the same channel. That would be 530W at 4ohms, so figure about 265W per sub. The other option is to pick up a second power amp, which I don't mind doing, but I'm not sure if it'll make enough of a difference to justify the cost. I just know that subs suck up a ton of power, and if that last 35W is a lot, I'll get the second amp. Even if I stay with one amp, I think that the second sub will make a HUGE difference. Am I right? Curious to hear everyone's thoughts?