Nomoretweaks

I have Arcs is a very slightly larger room than yours and use them quite close to the wall (closer than the Shahinian recommended 30cm). I have a friend with Obelisks in a similar sized room and these need more room to breathe. Primarily this isn't casued by the based but by the additional midrange and treble units (one more of each than an Arc) causing a harshness from the immediate wall.

I think that the primary requirment may be down to your amplification, Arcs are far easier to drive than Obelisks (Obs have a significant dip in their impedance curve making them require very current driving amplifiers)

Both of them have great room filling capabilities and I often use my Arcs when watching the TV which is off to the side of the room. The sound just fills the room at low volume so you don't notice that the sources of the sound are way off from the TV picture.

If you are buying new, then I'm sure a Shahinian dealer would do a home demo/loan (though delaers aren't alwayd local, but you can't be far from Infedility)

If you are buying s/h, then I would suggest buying a pair of Arcs to try as these are much easy to sell again s/h if you don't get on with them. (or your partner doesn't like veneered swing-bins)

Beware though once you have had Shahinians you can't go back!! (that will suit your username!)

There are many Shahinian users on PFM so you may get a better response over on that forum.

Mr Perceptive