Missing tube integrated for Klipsch Forte III?

With my Heresy IV speakers I am using Tung-Sol 7581a tubes in my Primaluna Dialogue Premium. Find they have almost the minds of the El34 but stronger low end with the extra watts. Used KT88s,  EL34s, and KT120s previous but the 7581a is the keeper for me.

Not likely a fix for the lack of bass though. Subs or a different speaker.

Considering the big listening space of OP, I also recommend adding subwooffer.

If he want to use tube amp, then I recommend used Rogue Cronus Magnum II with kt120 tube which has lot of power and good extension to the top.

Thomas

I think that the triode (6550, KT88s, etc) amps are going to be better top to bottom if you want a more linear/accurate tube presentation. If want a warmer and thicker presentation then the pentode (EL34 EL84) amps will be better.

I far prefer the triode amps but I like a more neutral presentation and would tend to alter the presentation with tubes or cables as needed. I think it is easier to make a neutral amp warm than to make a warm amp neutral. 

The Fortes never struck me as a very subtle speaker so some of the more sublime and nuanced amps might find these qualities lost on the Klipsch. I think that there is a good synergy between Klipsch and tubes. I cant stand S.S. on Klipsch speakers, but have not heard them driven by really high end S.S.

I believe that the Fortes have a rear firing woofer. If this is the case, I cant imagine putting them close to a wall would be a good idea.

They don't have a rear firing woofer. It's a passive radiator.

I own the Klipsch Forte III's along with several other speakers and class A solid-state amps and tube amps. I totally agree with those that say you should add one or two powered subwoofers.
The bass is good without the subwoofers but I don't think you will hear what you desire without subwoofers.