Everyone has offered some fine advice so far excepting one very effective modification which will cost you much less money than a new amplifier and at the same time dramatically improve your overall sound. Get your self a second pair of DQ-10's and stack them one atop the other (4 lengths of 3/4" square aluminum tubing works perfectly as a frame). Wire the speakers in parallel (4 ohm load) and your amplifier should double (or nearly so) it's output wattage. 200 watts into stacked Dq-10's is SPECTACULAR! I have been listening to mine that way for over 10 years. Hope this reaches you in time.
Al B.
Al B.