Those are some nice amps. Did you build them?
If you did, you did a helluva job.

Fancy parts...simple layout...nice....

Those Klipsch probably romp in that room.

Do the amps seem like they need a bit of gain to get loud?

If they can boogie with a couple volts of line voltage, you can probably build a passive stepped attenuator or use a CD player with a variable output, until you find/build a tube pre-amp or whatever.....

Some say a passive attenuator doesn't have the body and soul of a well matched tube pre-amp/linestage and I kinda agree.
All my console amps sound fine with my Aikido homebrew linestages, it gives them more gain, body, bass, and makes them more open.
And they are quiet with the linestages.

The DHT SE 2A3 amp.......different story.
Every little bit of noise, microphonics, and HF hash that comes from the linestages, pumps out in all it's glory on the triode amp.
Bottom line, I need to build a better more quiet refined linestage for use with that amp.

Nonetheless, the 2A3 doesn't really need much gain and is plenty open, with good full tone and bass with just using a stepped attenuator.
The linestages just make things a bit louder, but just they seem to be in the way.

Dunno when your Fortes were made, but I had a pair of '95 Chorus II's.
If yours are anything like mine, the crossover network is a PCB board with mylar caps for the tweeter, a bi-polar electrolytic for the midhorn, and a bi-polar 'lytic for the woofer.

I went hog-wild and built homebrew crossover networks for the Chorus II, spent like 250 bucks........
The woofer and tweeter caps aren't that big of a deal, and the inductors are fine, but those 'lytics on the midhorn are worthless.

If those fortes have a bi-polar 'lytic for the mid-horn, do yourself a favor and at least swap out that cap for a metal polyprop or a film and foil capacitor.
A Dayton or Jantzen, Solen........anything but a fucking electrolytic....

And they use cheap bi-polar 'lytics as well....Klipsch cheesed hard on those networks......

My Chorus II's had a 6 uF cap for the midhorn, 6 mics ain't that spendy for a decent cap.....might get some 2 uF caps for the tweeter as well, they ain't spendy at all...