So i bought a PB-2000 off amazon(didnt realize i dont get the upgrade period) its impressive but i have a null in room(14 x 15 with 8.5ft ceilings) looking to add a second sub to smooth things out. dont really know i need more deep bass output i would like more slam. thought of adding a PB3000, but really the second space i have is pretty small, a PB1000 would fit much better without making things look horrible. So can i mix and match a bit? would having a pb1000 gain me anything or be a waste?