Tube Pre-Amp, vs Solid State with Tone Controls/EQ to take edge off the top end?

Ok,

Really dig my current speaker set-up, they do 90% of what I want at a reasonable price.   (leaving brand out of here so as to not go off track).  

Using a Pass Labs 250.8, and really like it.  Trading out for a lower priced amp immediately gave me a smaller soundstage.  I believe Nelson voices his amps to have a bit of tube like sound but while keeping a solid low end.

Using a Pass XP-12 pre-amp, it's a great piece.  Does what it does really well.

But... I'd like to ever so slightly de-tune the top end on my speaker.  Just take it down a slight bit (usually only when above 90db).

Thoughts on trying a pre-amp with tone controls or an EQ, vs a tube pre-amp? (or a big integrated amp even)

Just looking for others thoughts. Thanks.