Advise taken, I am using 1/2 space sim in hornresp, so I assumed that would be close to in room...?
Yes and no.
Most reasonably sized rooms will have a bit of reflection reinforcement i the nether regions.
It really starts to get useful below thirty hertz. You get about 3 db here, and usually about 6 to 8 at 20 hertz.
Below this you are really working in the pressure field, as in the room is much to small to create a reflected true to length wave of the sounds. So you get even more reinforcement. At 16 hertz a great many studies have shown that there is about ten plus db of room gain.
Now for the good/bad news. Not very much program material has large peaks down that low. It's mostly higher harmonics or multiples of the low frequency fundamental notes.
Even nasty pipe organs are not that killer down low. A few are, and I have the recordings to show them off.
Some movies to have the odd bit of thunder.
SO what does this have to do with your box design?
You can reduce the size but not the path length and create a design that will produce what you want in room.
If you are really keen on getting this right there is a fairly simple method you can use if you have a measurement microphone and REW.
Yes and no.
Most reasonably sized rooms will have a bit of reflection reinforcement i the nether regions.
It really starts to get useful below thirty hertz. You get about 3 db here, and usually about 6 to 8 at 20 hertz.
Below this you are really working in the pressure field, as in the room is much to small to create a reflected true to length wave of the sounds. So you get even more reinforcement. At 16 hertz a great many studies have shown that there is about ten plus db of room gain.
Now for the good/bad news. Not very much program material has large peaks down that low. It's mostly higher harmonics or multiples of the low frequency fundamental notes.
Even nasty pipe organs are not that killer down low. A few are, and I have the recordings to show them off.
Some movies to have the odd bit of thunder.
SO what does this have to do with your box design?
You can reduce the size but not the path length and create a design that will produce what you want in room.
If you are really keen on getting this right there is a fairly simple method you can use if you have a measurement microphone and REW.