I've just found an ad for a VMPS smaller sub (12 inch woofer, 15 inch passive radiator) for $200 CDN. I've heard good things about these subs, but the downside ifor me is they are passive. I have an Adcom 535II amp I could use to power it. Two questions, before I go look at it, today hopefully:

1. Would this be a substantial improvement over my Paradigm PS-1000 V4?

2. How would this hook up to my Denon AVR-1603 receiver's sub out? Would I need the Adcom amp and its matching preamp hooked in together, or just the power amp and use the sub level control on the receiver to control the volume?

Many thanks in advance.