The Altec M19s are "big" in size and in sound. I bought mine for about $1200 and I have never seen or heard a pair of speakers, new or used, that I would rather have for the money (given my choice of amps on this system, which is low-power tubes). Are they perfect? No, but they are a lot of speaker for the money on a turnkey basis, and probably can be modded/improved (I bet a good DIYer could have a ball with these - improving some of the parts in the XOs, changing to the BMS HF drivers, adding supertweeters, bracing the cabinet) for not much money. I like them because they are highly efficient, giving me a lot of flexibility on amps. Plus, they have a fan club so are likely going to be easy to sell if I ever do.
The
Audioheritage website is a large and friendly community of Altec users. If you say where you are and that you would like to listen to a pair somewhere close, I bet you could find someone who would offer a listening session.
I bet they work in bigger rooms like yours better than they work in small rooms (like where mine are). So far I have found the XOs to be surprisingly supple. I will probably end up getting a Behringer to see how I can tame the speaker/room interaction.