Humpbacking a BiB

DrewP · 15th August 2008, 11:51 PM

Have been pondering what if any ill effects arise from having the panel directly behind the drive unit in a BiB so close to the driver.

Would it be possible to make a chamber behind the driver to reduce the intensity of reflections with the taper exiting above and below without stuffing up the performance? (assuming that you put a corresponding hump in the rear of the cabinet if you're using a folded taper so that the cross section remains constant.

Is this effectively any different to placing a spacer panel on the front of the cabinet to move the drive unit forward anyhow, or does the whole BiB thing rely on a smooth taper in the line with as few interruptions as possible?

Scottmoose · 16th August 2008, 08:26 AM

The latter, if it's to remain a BIB anyway. It's a pipe horn. Generally, a little damping is placed behind the driver anyway, which prevents any issues with early reflections. Nothing to stop you making a version with a low pass filter chamber of course.

15th August 2008, 11:51 PM	#1
DrewP diyAudio Member Join Date: Jan 2002 Location: Canberra, Australia	Humpbacking a BiB Have been pondering what if any ill effects arise from having the panel directly behind the drive unit in a BiB so close to the driver. Would it be possible to make a chamber behind the driver to reduce the intensity of reflections with the taper exiting above and below without stuffing up the performance? (assuming that you put a corresponding hump in the rear of the cabinet if you're using a folded taper so that the cross section remains constant. Is this effectively any different to placing a spacer panel on the front of the cabinet to move the drive unit forward anyhow, or does the whole BiB thing rely on a smooth taper in the line with as few interruptions as possible?

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16th August 2008, 08:26 AM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	The latter, if it's to remain a BIB anyway. It's a pipe horn. Generally, a little damping is placed behind the driver anyway, which prevents any issues with early reflections. Nothing to stop you making a version with a low pass filter chamber of course.

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