Looking for a good full range floor stander

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.

Check out a few ads for the Pioneer S-1ex’s .  My friend has just sold his S-1ex’s and bought TAD CR -1’s fo r20g’s,  and said close to 90% of the S-1ex’s

Sandy wouldn’t do it, to deal with a long discontinued loudspeaker with proprietary parts without the possiblity of having spares no matter how cheap they are is a dangerous gamble.

Not to mention that if you ever want to sell them finding a buyer again might not be so easy, then consider the limited efficiency, lack of deep bass, and limited power handling especially for this man’s large volume room, not going to be good.

Rbach this is why we post, because so many people don’t get that system matching is coupling the loudspeaker to the room and matching the loudspeaker to the the matching gear, sonic qualities, power handling, etc.

You think its all about making sales, as we stated the likley hood of selling this gentleman a set of speakers is low, however, we are hoping that the OP will make a good decision and get a great set of louspeakers that will work for his room, electronics and musical tastes.

Ron not everyone wants two large subwoofers and the price of the Proacs +  2 jl Audio Sub, and the JL Crossover will far exceed his budget, also we did agree with you on this point, howerver, the point about having 600 watts and not blowing a speaker we would not agree with,  the livelyhood of playing loud hitting a peak and killing woofers even using a crossover may not protect the speakers as per a large room and the Bryston's that we would diagree with you on that one, everyone's idea of a large room is different and the other part of this equation is, total contigious volume if this large room is open to any other rooms, than the room goes from very large to titanic 

Dave and Troy
Audio Doctor NJ

When I was in high school, I had a job in a tobacco shop. One day, the owners asked me.. “what is the best cigar?”. I rattled off the names of some high end makes. Cohiba. Montecristo. he shook his head. After I had named about a dozen and he’s still shaking his head, i got annoyed. “OK. what IS the best cigar then???”

He smiled and said “The one you like...”

At first, I thought he was being a smartass, but he was trying to teach me something. We had people who would come in to buy $20 cigars and people who liked $2 cigars. In the end, the only thing that matters is that people found something they liked.

One of the things I despise about the audiophile community is their willingness to dismiss anything that is not esoteric or expensive AF as patently inferior. Many expensive hobbies do the same thing, but music is so subjective and sound is so personal...that it has to boil down to what makes you smile.

The joy of listening to and being moved by music is really the goal. The hardware is merely a means to an end. When the vehicle becomes more important than the destination, everything goes to hell.

My only advice to the OP is this. Experts are fine, but their ears won’t be listening to your system, you will. Trust your ears and try to find someone who is willing to float the idea that the “best” thing for you might be something different than the “best” thing for them.