Speakers choices for AR REF-5/75s


Hi Folks-

Upgraded to Audio Research equipment and am driving a pair of Audio Physic Sparks. They were perfect with my SF Power 1 /ARLS2BMKII set-up. 

The speakers still sound is good. I like the sound staging, and ability of the speakers and amp/preamp to recreate the acoustics of the place the music is recorded in. BUT I'm looking for something else/more. Not sure what. Perhaps a tad more life/edge, which is why I'm soliciting advice.

My room is 12' x 20', with my sofa about 8 feet from the speakers, which are a 4' from the wall.

New or used, my price range tops out at $4000.

Thanks in advance!
David
128x128wharfy
Hi Erik-Using Ayre Codex DAC with an ARCAM CD player as transport.
Room treatments- Tapestry on back wall to lessen reflective noise.
Speakers are toed-in using the Audio Psychic positioning placement "secret formula."

Listening yesterday I realized I want bigger sound. If this makes sense, the equipment upstream wants to sound bigger, but the speakers won't let that happen.
What sort of music do you normally listen to and how loud? I probably don't have as wide of a hands-on ownership experience as some of the old timers here but all things equal when it comes to speakers in particular, I'm convinced that certain speakers sound best for certain types of music which sort of indirectly implies how loud they are played. I don't know if it has to do with how pressurized the room needs to get for certain speakers to come alive or something else. Not sure others agree.
You will probably enjoy a horn loaded/based speaker like the Avant Garde, Tannoy Canterburry or even the Zu Audio. They will sound much more lifelike and present.