What is the best way to tame a slightly bright speaker?


I know the answer is get a speaker that isn't bright,  but I've got a pair of TAD Evolution Ones that I like quite a bit except that the magnesium midrange and beryllium tweeter are just a little bright for me.  I'm driving them with a D'Agostino Classic Stereo, which I needed to drive my old speakers but I don't need all that muscle for the TADs (89db sensitivity, 4 ohm impedance {doesn't drop below 4 ohms}) recommended power 50 to 250 watts. 

I'd like to get  an amp that does voices especially well.  I know somebody posted recently that a subwoofer solved his brightness problem and I may look into that at some point.  Any and all suggestions are welcome.
128x128tomcy6
Thanks everyone for your replies. They are varied as one would expect.

My room is far from ideal, but I don’t think it’s having a major impact on this problem. The listening area is carpeted and has a fabric sofa and chair and the house has an open floor plan, so I don’t think it’s excessive reflections. This suggests to me that maybe subwoofers would help.

I do agree that room treatments could improve and maybe eliminate the brightness, but that would probably be the most difficult way to attack the problem. It’s something I would like to do over time, but it will require a lot of time and expertise.

There have also been suggestions for cables and the controversy that comes with them. I’m using Analysis Plus Clear Oval speaker cables. Don’t let the name fool you, they’re not bright cables. I don’t know how they came up with the Analysis Plus name, but they’re just good quality copper cables using their proprietary oval construction methods (to reduce skin effect, according to AP). When I get the right gear together I want to experiment with cables with The Cable Company, but I’d rather not try cables at random, unless someone has experience with these particular speakers.

That brings us to upstream gear. The D’Agostino Classic Stereo that I have is a powerhouse amp, 300 watts at 8 ohms 1,000 at 2 ohms according to Stereophile. I don’t need that power with the TADs and changing amps would probably be a good place to start. Would a Class A amp like a Pass or Plinius or Accuphase relax the mids and highs a little or just give me different sounding bright speakers? I don’t think the D'Agostino is a bright amp but I haven’t heard it described as laid back or refined either. Tubes are another option. Any suggestions for a change of amps?
Tubes were the biggest improvement in taming my 801Ns.  Made the mids and highs much more listenable to me.  I still use SS muscle for the lows tho.

Bill
What geoffkait said may sound funny because he is that way some of the time. But that is a real possible solution. I have used that method and it helps out a noticeable amount. Geoff probably knows why, but it has worked for me. If you do it, get some that are cotton or wool, preferable wool and get a neat design, It can look good on there with a neat design. Geoff is not only funny 1/10 of the time but he is practical about 1/10th of the time.