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Old 23rd October 2008, 11:18 AM   #11
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Just one point: remember the BIB is a corner horn. It will not give all the gain it is supposed to if it is positioned away from corners or at least a wall (which also removes any need for compensation circuitry).

Quick illustration: some rough measurements a builder (sorry -can't remember who it was, but I saved the graphs in case of need) took of these cabinets in corners, a little way out from corners, and pulled well out into the room.
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Old 23rd October 2008, 11:32 AM   #12
AndrewT is offline AndrewT  Scotland
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Hi Scott,
the BIB in the corner smooths out many of the resonances, but the 155hz notch and 310Hz peak still appear.
These are exactly one octave apart.
Can you explain them and whether they are audible and/or removable.?
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Old 23rd October 2008, 12:49 PM   #13
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As I said, I didn't measure them, nor do I know what drivers were being used, or the dimensions & behaviour of the room. So your guess is as good as mine on that score. The only reason I posted that was as a general guide to illustrate what happens to the LF gain when you deprive a corner horn of corners.
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Old 23rd October 2008, 01:05 PM   #14
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Hello Scott,

Going to take your advice seriously.
Start in a couple of minutes changing the position of the BIB's.
Closer to the side wall.
Wil report back later about differences in bass output.
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Old 23rd October 2008, 03:01 PM   #15
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My listening experience supports the charts Scott posted. You immediately hear the contribution of corner loading BIBs. Pull them out of the corners and bass diminishes... just like in the chart. I do not hear any peaks or dips in bass response with my BIBs. Not that the response will be smooth as glass, but nothing sticks out or sounds incorrect when positioned properly. Those charts may reflect something in the room or something else but the overall trend, i think is correct.

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Old 23rd October 2008, 04:52 PM   #16
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I placed the BIB's closer to the side walls and there was more bass!!
Question?? Scott, Godzilla , The closer the better??
The best I can do is 100 cm to the back wall and 40 cm to the side wall. This after a complete rearrangemant of the room.
For this moment the place is 160cm and 65 cm.

Perhaps I can put them upside down (floorloading) ??

any suggestions ?
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Old 23rd October 2008, 05:25 PM   #17
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Within reason, the closer you move them into the corners or against a wall the greater the coupling. There's no hard & fast rule, so you'll have to experiment, but at the end, you should be able to loose the passive circuit.

Re inverted types, that's a good way forward with smaller drivers / a higher tuning frequency, or if your ceiling is too high to allow effective coupling (sounds like yours is fine though). The potential downside is that there's more in the way on the floor than the ceiling, so it's a case of whichever compromise you personally find works for you.
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