Room size.

There is no real value to defining room sizes. The point is in general you need larger speakers to deliver flat extended bass in larger rooms.

A good example is Ohm Walsh speakers. https://ohmspeaker.com. You will find every speaker there provides specs on the range of room sizes each is suited for. Too large a speaker in too small of a room will deliver too much bass. Too small a speaker in too large a room not enough. The right amount provides near flat response down to the lowest frequency spec’ed in the right sized room.

Beyond that, room acoustics will always have an effect on bass response producing more at some frequencies and less at others. That’s where setup and possibly room treatments can come in.


The Ohm Walsh very wide dispersion near Omni speaker design is pretty unique though and makes it easier to place the speakers effectively in the room for good results than more directional designs. Also closer to walls and corners which tends to reinforce bass.


The Walsh models large and small all tend to sound similar placed in the right size room.

So how big the speaker need be and how much it will cost is determined primarily by room size which makes choosing the right model per room very easy. 
More detail:

https://ohmspeaker.com/news/how-big-is-a-big-room/

Hope that helps.

My room is only 11x10 x 9 and I have Thiel CS3.7's in there. For over a decade I was hearing that you need a large room for these speakers so I held off from buying them. However, recently I put in room treatments and then Convolution file based DSP and the CS3.7's sound about 95% as good as in a much larger room. I no longer am working on improving the acoustics of the room just trying out different gear. I use ROON to run the Convolution.

In my own case, height proved very important, as my ceilings are low (6.5 feet). Otherwise, my space is 14 ft. by 28 ft. with a hallway connected.

A low ceiling meant that tower speakers weren’t possible. I tried several, all with different tweeter technologies. All were impossibly bright, no matter what I did. Stand mounts were what I had to do, on lower than average speaker stands.

MC mentions Townshend podiums as a method which "alleviates a lot of bass problems everyone will have you believe can only be handled with tube traps." He didn’t mention he has a distributed bass array. That’s a big part of his bass solution, but I am not sure if your room size would be amenable to a DBA. If that is true, I suspect that the podiums won’t be enough to obviate bass traps. (MC, can a small room handle a DBA? If not, won’t he need some bass traps along with the special podiums?)

I suspect that the podiums won’t be enough to obviate bass traps

Use some discarded tubes and pipes, seal them with plastic sheet, try different volumes or/and heights, put some straws with some different leghts and diameters, ( cut the straw in diagonals to be able to insert one part into one another for variable lenght and also very minute diameter experiment) listening experiments are needed to fine tune... It takes me a month for my 32 tubes...But the result is totally without audible flaws and i control ALL aspect of acoustics: imaging, soundstage, listener envelopment and trimbre perception...
 
It is the beginning of my " Helmholtz mechanical equalizer": cost nothing...Just fun to deal with the listening experiments.... Trust yourself....

My bass is clear, touch my chest and i own only 7 inches driver able tough  to fill my room with a brass orchestra with a tuba... 13 feet by 13 feet 81/2 feet high...

No need for a sub , i own one and it is disconnected for ever.... 😊 And i like bass...

I dont listen cinema and plane coming down for sure....But the note of the tuba are all there....

My bass is marvellous....

Vibrations devices can clear the bass NEVER  increase it in the room..... I know, i own my own springs devices system .... No cost also...

Science gives more money than it ask for..... 😊 The opposite of many tweaks....Replicate them or create them....