Is it my amp or my speakers?


I've been dissatisfied with my system of late--wanting a little more brightness and color--and can't decide if it's the amp or the speakers, or both. Here's the set-up:
  • Krell KAV-300i integrated
  • Cyrus CD-T
  • Schiit Gungnir DAC
  • Tekton Lore speakers
The Krell was a hand-me-down (!); everything else was purchased new. The amp had some overpriced work done to it a few years back and I'm wondering if the workmanship is starting to show, or possibly its age (~25 years, I'm guessing). Or, are the amp and speakers mismatched?I can afford to invest about $3K in the system, but am unsure where best to put it.Any thoughts/advice would be much appreciated.
danto
Thanks all for the v. insightful analysis. Got what I had hoped for from the community. Majority verdict: the speakers. I like the Tekton business model, but the array of speakers is way overwhelming (there were many fewer options when I purchased mine, 8-1/2 years ago). Back to the endless task that is research! Thanks to @smrex13 for the very good suggestion of "Places like Crutchfield and Music Direct have trial periods that will allow you to hear the speakers at home with your system. "
New speaker time

Add Audio Advisor to that list; some independent B&W shops also allow for at home auditions (e.g. Audio Connection NJ).
These speakers will sound best when you are on the woofer axis.  If you are far above it you'll lose quite a bit of treble.

Assuming your seat/speaker are aligned if you still have issues,sit 2’ from the speakers. If they still sound colorless, it’s the speaker, otherwise it’s the room. :)
@millercarbon the reviews on those are great, but, man, 118#! and 54" high! there is the wife factor to consider...