OK, I hooked up the Presidians to my trusty Sharp SD-EX111 (which was THE killer deal on closeout for $70 at Overstocks.com) and right out of the box they sound pretty good. They are a bit lacking in bass, but sound pretty good and much better than the $40 would suggest. Of course, they will likely improve when they get some break-in time on them too...
I took an opportunity to open up the speaker to take a look at the components. There is only a single 1 Microfarad capacitor on the (+) tweeter lead, so the mid-woofer is running rull range. The box is very cheap and thin MDF with no internal bracing (except a bit in a couple of corners. The port is a cardboard tube glued to the inside of the back panel. There is no stuffing or sound dampening material inside.
So, for the adventurous type, possibly changing the cap, internal wiring and adding some dampening may provide some sonic gain for very little money.
Enjoy,
TIC