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Room mode calculators like that Amroc one are based on the (almost never correct) assumption that your walls are 100% reflective of bass frequencies. Given your room situation, I'd say there's little to no use in trying to use them to work out what/where your room modes are going to be (I'm not familiar with the REW one - perhaps it's a lot more sophisticated).
However, setting up a speakers/subs and measuring will be useful, making adjustments (to speaker/sub position and/or with EQ if available) until you get the bass about right at the listening position(s). Getting a second sub and not spending as much on as large a pair of speakers might be an equally good option IMHO.
Big speaker sound tends to result from (1) having a system that is capable of high SPLs and low bass without significant distortion and (2) the physical size of the speaker, which tends to result in (a) narrower dispersion in the midrange and (b) less interaction between the direct sound and the sound reflected off the front wall.
(1) can be achieved with smaller mains + sub(s), while (2) requires either physically large mains or (in theory at least) some form of cardioid directivity control, a la D&D 8C or Kii Three. In general, two subs is better than one when it comes to smoother in-room bass response.
However, setting up a speakers/subs and measuring will be useful, making adjustments (to speaker/sub position and/or with EQ if available) until you get the bass about right at the listening position(s). Getting a second sub and not spending as much on as large a pair of speakers might be an equally good option IMHO.
Big speaker sound tends to result from (1) having a system that is capable of high SPLs and low bass without significant distortion and (2) the physical size of the speaker, which tends to result in (a) narrower dispersion in the midrange and (b) less interaction between the direct sound and the sound reflected off the front wall.
(1) can be achieved with smaller mains + sub(s), while (2) requires either physically large mains or (in theory at least) some form of cardioid directivity control, a la D&D 8C or Kii Three. In general, two subs is better than one when it comes to smoother in-room bass response.
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