PSW10 with Bargain Basement 2ch Receiver?

LG100

I got a pair of Polk TS15 (Best Buy) monitors and a Sherwood RX-4105 receiver to put out in the shop recently and was very pleasantly surprised with the sound, considering the total purchase set me back less than $150. This is set up in a 14' x 24' barn style structure and I'm wondering if I was so pleased with the return on the small change I spent for monitors and receiver, If a little more oooomph on the lower end might not be the icing on the cake. I can get the Polk PSW10 for a hundred bucks a couple of places around the 'net but my hesitation thus far is on account of the Sherwood receiver which is about as old-school-basic as you can find in a modern package and, apparently, has a reputation of shutting down quick if speaker loads stray more than a hair or two from 8 ohms. Two questions:

Would this receiver or others in its price range present a problem with the receiver>subwoofer>monitors hookup?

When this subwoofer is hooked up as described above, does the receiver revert to just a pre-amp and the sub and monitors only get powered from the in-sub-amp? or does this bypass the sub's onboard power amp in any way?

Thanks.

Outfitter03

Hooking up to the speaker level inputs and outputs should not present a problem to the receiver. The sub woofer has a very high input impedance on these connections so there is not a significant current load on the receiver. Some information is seen here:

http://www.crutchfield.com/S-1WGXrkbk8w9/learn/reviews/20031021/home-home_bass.html?page=3

The receiver still powers the monitors, just in a daisy chain through the sub woofer connections. The sub woofer input circuit samples and filters the input signal taken from the speaker wire input and utilizes the internal amp for the sub woofer output.