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
If you want to tame your bright sound and beautiful voice out of it.

You may try out Line Magnetic 508 or 805 SET amplifier (48W).

Stock tubes are not bad.

But after some tube rolling, it is an excellent amplifier to drive high efficiency speaker.

https://forums.stevehoffman.tv/threads/new-line-magnetic-508ia-integrated-amp.542333/page-36
I actually disagree with the notion that a properly integrated sub can't make the tonal balance of a system better and in some cases much better. I have the same issue in my system of "bright" treble and when I introduced a REL sub and worked with it for awhile to make sure it was properly integrated, the tonal balance in all frequencies was much better and much more natural sounding. Sometimes the illusion of bright treble is just that - a tonal balance in the speakers that perhaps is lean in the mids so it brings attention to the highs more. 
gawdbless+1
tomcy6 If you are kind enough to tell how you tamed it, as everyone here has tried to help you, you maybe helping someone else