Unfortunately I cannot address the tube amp question, but I can give my 2-cents on the others. I have a pair of DQ-10's in a 9X12 bedroom powered by a Bryston 3B and I think they sound great. They do not overtake the small room and they are not at all harsh or agressive when powered by solid state amps (at least not with the Bryston). They do seem to need alot of power, but they are an 8-Ohm speaker so I don't think they are a difficult load to drive. When compared to my Magneplanar MG-1.6's the Dahlquists have slightly less resolution and bass, but to me they are a great sounding speaker and definitely worth the time to listen to. Thanks, Jason.
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I own the Dahlquist 20i speakers and have had them for years. (Actually my 3rd pair of them). You really need to run Dahlquist speakers with tube amplification, much better than ss. I run them with Von Gaylord monoblock amps and the sound is amazing: rich, warm, and detailed. I listened to many amps before I made the decision to buy mine and absolutely love them. They do have an integrated amp, I'm not sure how this would sound with your Dahlquists, you could probably call the company and they would recommend what's best for you without trying to oversell you. Their stuff doesn't come up used very often though. Another amp I liked was the McIntosh tube amps, although I never had them in my system. You can pick up used ones all the time, try Audio Classics. Sandra
The DQ-10s are inefficient and need plenty of power. Dahlquist never published their sensitivity rating, but it's somewhere in the neighborhood of 85 dB. Your Jolida 202a puts out 40 watts which should be able to drive them to a moderate level (97-100 dB). Why don't you live with this combo for a while and decide later if you need more power? Your room is relatively small which plays to your advantage.
The 10s are not too finicky with placement. You'll have to experiment and find out what works best for you. I've had great results following Cardas's suggestions.
Mingles' response is right on target. In order to make those speakers sing, you need much more juice. Back when I owned DQ-10's in the 1980's, I used 250 watts per channel, which was very nice. I would say anything solid state north of 150W wwould be quite satisfactory. but, just as Mingles stated, go ahead and enjoy them with your current setup. That way, when you do upsize your amp, you will really appreciate the difference.