proper Tannoy Canterbury room set up

Congratulations on a very wise purchase! My Canterbury SE's are similarly positioned to your Quads and sound excellent.
One of my concerns was easy access to the back because I change speaker cable once in a while. I assume yours are new,
so don't be put off if they are coarse in the midrange for the
first 20 to 100 hours, breaking in. Then they are as good as
your equipment permits... Enjoy!

William, congrats on your choice.

Possibly the best thing you could do is buy Jim Smith's book, "Get Better Sound" which includes extensive set up advice. Coincidently after writing that Jim bought a pair of Canterburys for his own system.

Also Dan, I've read many helpful comment from you regarding Tannoys, but since you refer to the "back wall", what do you call the wall behind yourself when listening?

Don't put them against the wall. The manual even advises against this. You'll see Tannoy speakers in wacky locations (like right up against the wall) in ad/product photos, but that's silly. Your listed distances sound like a reasonable starting point, though with a 14' front wall you'll observe that the bulk of the speakers themselves will start cutting into your optimal spacing. It's still quite workable, though. You were wise to scale back from the Westminster in this case!

I like a nice midfield triangle myself (6.5-7' x 8-9' x 8-9'), with a healthy dose of toe-in -- close, but not *quite* directly pointed at the ears, and certainly not crossing over in front of me (a very questionable manual recommendation there).

The tweeter height is an issue with the Canterbury SE. Get pedestal stands or pucks to tilt them up. Perhaps the GR has more treble energy to allow for the right amount of off-axis energy, but then that would become dependent on seating distance -- so hopefully the GR also sounds best with tweeters and ears level, and it remains up to us to achieve that.

Raising Canterburys -

A friend with Canterburys was advised by Jim Smith to experiment elevating them and found that did improve upper frequency info. Pay attention to Mulveling!

Thank you guys so much for you thoughtful insight. I certainly is great to have such a fine community to help support our fine hobby.

So sounds like a good starting point will be to position them in the place the Quads were and go from there, along with elevation to reposition the highs to about ear level. Maybe I will fashion a stubby-stand for them to elevate them - maybe like a sealed furniture grade box to sit them on and fill with sand or some other mass filler.

As far as wiring goes -- should I connect my cable to the bass inputs and then use jumper to go to the high input /or/ connect my cables to the high inputs and jump to the bass inputs /or/ should I biwire? Now, I have not biwired before -- if bewaring is the proper and best way to do it -- would I just use two cables and connect both to the 'only' outs on the amps and then the other ends to the highs and bass on the speakers (like a 'Y')? Does doing this change the ohm resistance that the amp sees???