I would not advise this - that 3" polydome mid was discontinued - it won't play loud enough for you space requirements - you will suffer terrible midrange compression and difficulty to hear dialogue on movies in such a large space or worse you will blow them up.
There is a replacement but it looks Mickey mouse
Have you considered panels to reduce the room size across the middle and hanging baffles from the ceiling - it is a very long room (like a tunnel) and you may end up with very long reverberations as you get in a church or gymnasium ( you say it is concrete). The mirror glass on one side will also act as a very strong reflector.
Narrow dispersion type designs or horns might be your best bet (you probably will benefit from limited dispersion and the higher SPL that horns can achieve)
There is a replacement but it looks Mickey mouse
Have you considered panels to reduce the room size across the middle and hanging baffles from the ceiling - it is a very long room (like a tunnel) and you may end up with very long reverberations as you get in a church or gymnasium ( you say it is concrete). The mirror glass on one side will also act as a very strong reflector.
Narrow dispersion type designs or horns might be your best bet (you probably will benefit from limited dispersion and the higher SPL that horns can achieve)