I would look for (what I have, imagine that):
3 way, 15" woofers. Solid directional bass.
no ports, or if so, front mounted only, option to close them.
efficient enough to allow you to try tubes some day.
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Your space seems unproblematic, but you never know for sure.
How do you adjust them to your listening space?
Many of the big speakers in the old days had level controls. Even the smaller AR-2ax’s I just restored have level controls.
My 4 L-Pads are wonderfully difficult. However, I get the best response possible. After doing it ’by ear’ for 48 years, I finally bought an inexpensive sound pressure level meter and have a test cd with selectable individual frequencies. So easy, so good!
Even without level controls, the meter on a tripod at listening position, and test tones help you refine locations, and toe-in, perhaps alternate toe-in, one for you in the center, another for two listeners, each off-center.
IMO: Now that they are so inexpensive, speaker makers should add L-Pads again, and include a meter and test cd in the box!!!