merlin vsm owners , what is your room size ?

It seems you have answered your question, the amp doesn't have enough "drive" to excite the room and engage you as it did in your previous room. I went through the same issue when I moved to a larger room when I was using a 25 watt OTL with the VSM. You just need more power to fulfill what it is you feel missing. This is really subjective from listener to listener but amplifier power seems very much the issue in your case.

thanx tubegroover

Merlin vsm is known to be driven easly (89db 8ohms)
I think my room is still small :)
Merlins may require SS 175 watts or tube 60 watts to be driven well.

many many years ago when i buy a speaker , i look at the maximum watts recommended for the speaker by the manufacturer,
And used to buy a matching amplifier with more watts than recommended , and it used to work, i think its the same with Merlins.

Less watts will drive ,but not with full potential.

Or do i need a speaker with bigger/more driver in this room ?

Thaluza, I think you have an ideal room size for merlins

I have positioned them

5 feet 9 inches apart, tweeter to tweeter,
2.5 feet from the side wall to side baffle,
52 inches from tweeter to the wall behind the speaker
and i listen from 9 feet

Any changes to be made ?

Masilu,

I used to use small speakers in my listening room but in order to build up a satisfying sound pressure level I would have to play the system louder than what I might prefer for a given listening session. By adding a sub I could develop a pleasing sound pressure level while keeping the overall volume lower. I described it as the system having a fullness of sound at lower volume. If this is the issue you are trying to rectify then I'd suggest a sub. On the other hand if it is overall loudness in the mid and higher frequencies that is the issue then I would consider more power.