Can my amp drive the Paradigm Studio 100s

You need a lot less power than most would tell you. I have heard 22w tube amp running Dali MS5 towers and sounded great. 90 watts is a lot of power.

I had the 80s, but drove them with an H/K 100 watt/ch. 5-channel amp. The H/K has a ton of current, which the 80s just loved. Your Denon should be able to power them to satisfying levels, but the bass would be better with a high-current separate amp.

As for bi-wiring - I tried this with the 80s but did not really notice any improvement in the sound. I'd recommend saving your money for better source matl. or an outboard amp...

-RW-

I have two Denon AVRs (rated at 140w and 110w) and find neither very stasfying for two channel music--as suggested above they may have enough power, but just don't sound good, esp. at the low end. Adding an external amp (in my case 120w Parasound HCA, 60w HK Citiation and various Adcom) improved matters very significantly--more detailed and much better bass definition.

I have those speakers and use marantz monoblocks at 125 wpc which is more than powerful enough, I'd actually be surprised if your receiver wasn't powerful enough for them

With some A/V receivers, they're OK running two channels. If you start playing action movies that runs several channels at the same time, then their power drops a lot lower. Here is an example of an another Denon rated at 140 watts.