Just playing with Basta! and like how it's one of the only tools I'm aware of that simulates box + baffle + room gain responses all together.
Is there a way to compare its response prediction with some other tools, just to sanity check?
Basically, Basta is indicating that room gain helps certain drivers reach acceptable F3s and F6s that otherwise wouldn't look so good.
Is there a way to compare its response prediction with some other tools, just to sanity check?
Basically, Basta is indicating that room gain helps certain drivers reach acceptable F3s and F6s that otherwise wouldn't look so good.
That is not so strange is it? But room gain sims always give a very rough prediction and don’ t take room modes into account. So imho it’s value is quite limited.
You can model your room in REW using an ideal flat speaker (set low frequency extension to 5), export that curve to VituixCAD and combine with your loudspeaker FR. I haven't tried myself, so there could unforseen complications. For example, you certainly need to normalize room transfer function to 0 dB, but REW assumes some output level from speakers and draws the curve at ~75 dB for regular room, at 110 for 35x35x35 m cube and at 45 for 1x1x1 m box (poor listener!).
But it takes room modes into account, and even model for absorbtion. This gives me an idea: you can find virtual speake output level by setting absorbtion to 0.9, highest value possible, and placing mic at speaker. Then use gain setting to sustract this value.
Except you cant as minimum gain possible is -18 dB. But you probably can shift level in VituixCAD.
But it takes room modes into account, and even model for absorbtion. This gives me an idea: you can find virtual speake output level by setting absorbtion to 0.9, highest value possible, and placing mic at speaker. Then use gain setting to sustract this value.
Except you cant as minimum gain possible is -18 dB. But you probably can shift level in VituixCAD.
That room gain is theoretical and is not effective in practice. It shouldn't be there... Sometimes you get a little helmholtz resonance in a room but if you do, it's not what you'd call predictable. I would switch the room gain off, and when it comes to using a room, measure as if to manage room modes. If there's any helmholtz action you can just bundle it in with the modes as far as dealing with it.
Lol, well I don't think there's any need to worry if you are going to manage the room, say with a multiple sub setup because if you do, then your response goes down cleanly all the way and there's no problematic rolloff to worry about. Your mains obviously can go down into the room controlled region, which is the important part. They can obviously also cover the voice region on their own, which is nice, but that shouldn't even matter because a multiple sub setup has the ability to be seamless when done right.
Makes sense; also muddies things up! As one could say sealed designs that look puny (vs vented) would be just fine with dual subs, yes?
Did you investigate the 'room' correction in Vituixcad? It is somewhat more elaborate than others.
I guess thats's true for typical American timber frame house, which is essentially transparent to bass frequencies. However, in European flats room gain is very real, as they are usually built of concrete or brick and effectively are sealed boxes of 100-250 cubic meters, so there you have it: zeroth order mode at 0 Hz, aka "room gain". You can have sealed box subwoofer with F3 of 40 Hz extend in-room to 10 Hz.