dull and lifeless is not a room problem. Since you tried 2 different speakers, I’d swap the amp.
I generally agree with this. By all means, OP should experiment with positioning in case he’s sitting in an null whereby bass is largely cancelled out - but quite often when sound is bad, it’s squarely the gear’s fault.
Now my favored Tannoys are a different than most because 1. their controlled dispersion makes them more room friendly and 2. their internal fast-on connectors (drivers, binding posts) are awful and come loose easily - but a lesson I learned is to ensure your drivers are actually wired correctly. At least feel the woofer surrounds during playback, to verify they’re working. A "cold" woofer will certainly make the sound lacking! I’ve also recieved a set of Tannoys with all kinds of mis-wired nonsense - out of phase, tweeter and woofer leads mixed up - they obviously sounded like GARBAGE until that was resolved, then they sounded GREAT :) There are many mistakes made out there, and they aren’t always caught.