Speakers need to be placed close to back wall. Help

Rustler,

Not sure of the specifics of a "medium sized room", what are the dimensions?

Maybe try the Buchardts in your space before installing them in your daughter's space....that should give you an idea if they will work for you.

OHM, LARSEN 4 or 6, KRIX or NSMT Audio Model 15SE, an acoustic suspension spkr with 3/4 inch anti-resonant cabinet, 1 inch baffle, first order xover, propylene caps, non-inductive wire resister, multi-strand ofc copper wiring and 5yr wty for only  $1995.

Guru QM5 v2. Great little banging speakers that demand wall placement. 

Can either the Buchardt or Larsen speakers really deliver big, medium sized room filling sound?

The Larsens can. I haven't heard the Buchardts, but I would say in general the best way to "room filling sound" with stand mounted speakers is to pull 4-5ft from the wall to create a deep soundstage in all that space. In your use case, that's not likely, so maybe not so much. In a smallish room, e.g. 10x12 bedroom, sure you can fill that with most any speaker. Low end may be on the modest side. 

The match between speaker and the room size and placement is pretty critical, so you may want to wait until you know dimensions and talk over furnishings and setup flexibility with your recipients. Hopefully the room isn't square, those are tricky and require a bit of finesse on setup(e.g. diagonal) to get the most sound for your investment. 

Cheers,

Spencer

All good advice, Spencer.  Many thanks.