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In Reply to: RE: Modding Tympani IV- basses? posted by AkuAnkka on December 01, 2014 at 12:01:42
Because that changes the radiation pattern and thus the distribution of room resonances. Any toe in moves energy from the long wall direction (and the low freq resonance of its length) to the short wall length, and reduces the portion of the output that catches the tangential wave (lowest freq resonance, and one you will only catch deliberately).
It is not that these modes are generally crucial, just that they fill out the bottom octave most impressively and more nicely than any dynamic sub I know of. So I am reluctant to let it go. As part of a Limage setup there is some compensation to the loss of imaging precision at low freq. Since this setup allows for the best balance of reflected and direct sound - at least if you can position the mid and tweeter close enough to the wall (again, the "ideal" distance seems to be a bit shy of 3 ft.) while the width of the speaker when setup in line puts the tweeter >4 ft.
You can place the mid/tweet in the split configuration with the bass panels at the closest bass loading position to the front wall, and fix timing issues with your DEQX, you just need to find the right placement and (slight) angle to avoid early reflections off the bass panels.
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Ok, thanks again Satie, that explains a lot.
Was it so that Limage setup is actually good only in a symmetrical box shaped room? My listening room is far away from that, with diagonal ceilings, other side wall close to speakers while another 10 feets away etc.
I was also thinking that if I would not be able to get a good results with inline setup, and therefore I would use the toed in setup, does it matter much if the basses are still touching the side wall, or should there be some space between them when toed in?
The bass loading scheme has to be symmetrical so the room has to be so as well.
If your space is not rectangular ( ideal proportions are about 1.2-1.4 and 1.6-1.8) then Limage setups are not possible in it. You would be far better off doing an equidistant arc and having a wing set up to jut behind the deep bass panel (should be to the outside). In the equidistant arc you can't have the wings go in front of the bass panel.
If you have the space for it, you can do it in reverse with tweeters to the outside and deep bass panels (and their wings) to the inside. Just make sure the tweeters have symmetrical proximity to sidewalls or are at least 4 feet away from any sidewall. If you could do the placement wall to wall then the ideal distance for the tweeter from the sidewall would be just short of 3 ft.
But, theoretically, if an equidistant arc setup is used, is it a bad thing if bass driver would be touching the side wall? Or should there be some free space for basses also?
The issue with one side touching the wall is the loss of symmetry. you can use wings to limit it, and DEQX to adjust for FR and volume differences but there will still be a family of reflections from that side that is not reproduced on the other side. Doable, but not perfectly. Probably an acceptable compromise.
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