Looking for a good full range floor stander

@milpai 

I agree with you that the Proac D48 would be a great choice.  I had a pair of D30r's (the D48's sounded great but were too big for my room) powered by a Bryston 14b cube amp and the sound was fantastic.  At the time I was thinking about the Legacy line but thought the Proac's were much more musical and way better looking.  Hope this helps.

Whoops, I also completely misinterpreted the point....my bad.

@paliden

As I suggested on the 1st page of this thread I recommend the Proac D48R. I have owned 4 pairs of Proac’s and have really enjoyed them. I recently sold my pair of D30R’s (little brother to the D48R) and bought a pair of YG Carmel 2’s. The D30R’s played deep and were nicely balanced. Proac’s are known for their midrange magic and with the ribbon tweeter, sound very natural and detailed. The D48R’s would be similar but would play much louder with deeper bass. I see TMR has a pair in black ash for $6792.00. I bought my YG’s through TMR around 6 months ago. They are great to deal with and offer a return policy. See below: from TMR’s website.

"Every product we offer carries a 14-day, satisfaction-guaranteed return policy unless stated otherwise in the product description.** Additionally, every pre-owned product purchased directly at www.tmraudio.com carries a 45-day warranty. During the 14-day return period, a return or exchange can be requested for any reason."

As you can see, after an in home demo if not completely satisfied you can return them.

Good luck and hope this helps

Dave a Bryston cubed amp with a Proac ribbon tweeter in a live room is not bright. I've had this exact set-up and it was fantastic. The new cubed amps have a smoother top end than the older SST2 models.

1 (2) JL Audio Fathom f112 subs @ 15"x18.5"x17.75" in size would completely disappear in a 20'x40'x12' room.
2 Using JL Audio's Digital Automatic Room Optimization EQ system makes for a seamless integration. The auto-EQ measures your room, attenuates the bass peaks and smooths out the bottom end. Stereo subs actually make for a smoother bass response.
3 Placing 2 small black subs in or near the corner of the front wall would visually disappear.
4 Bryston makes 2 Electronic crossover units. The 10B-STD and the 10B-SUB. Since the OP has a Bryston 17b3 preamp and a 14b3 amp, I'm sure would be an ideal match.

Other Issues:

1 Having a 600 watt amp doesn't necessarily mean you use all of the power to drive the speakers. A 600 watt amp has the ability to damage just about any loudspeaker.
2 Using two Proac D48R's crossed over @ say 80Hz into two JL subs would have no problem moving massive amounts of air in a large room.

 I've heard the D48R's in a large room (with no sub) play very very loud.

As everyone knows this is just one of many ways the OP could go.

 Actually having a really large room may be easier to achieve good sound. Small rooms tend to have bass problems that are difficult to control.
 
Thanks for your input and again good luck to the OP.