Best garage speakers

Older VMPS Tower II, or SE if you can find them. Dual 12", with 12" PRs
tunable for ANY room, or amp.. 12" sub, 12" mb (options there too), 12" PR.

They have everything, 19hz - 20k + They will fill 900 sf with ease.
The BASS will blow your mind, mids there are a few options and the highs are split between an inverted dome and a true ribbon. Actually a 5 way speaker, with 1st and second order XO, Bi ampable.
500 + watts 115+ db
or 25-75 goods tube watts (I used MC 240-275) push them just wonderfully.

BTW NO need for a sub, they really have it all, for the money. BIG boom boom in the room room.

4-700.00 about 100-120 lbs depending on the upgrades. They are a true reference speakers...

They can play chamber music to Rock and Roll
Z Z TOP, get down boogie...and right in to Island music...

Regards

That is a lot of square feet for a Bose 901,  If you can't find the VMPS floor standers, go with at least a horn loaded, or super efficient speaker.
The Bose, The Dalquist, that kind of speaker, your amp is gonna run out of gas real quick in that big of a room.. It's your $$$, you can still buy REAL smart, The Heresy is a great speaker, just will need to add a sub.
VMPS, no sub needed, really they will out do ALL of the suggestions, I've had most of them, at one time or another. 

Close to the 500 pairs of speakers I've actually owned, 130 pairs, I made or designed over the last 45 years or so.  VMPS is one of the few besides the older RS Infinity speaker line, I still tinker with. Infinity just isn't efficient enough, but surely good enough, with enough amp behind it.

Regards