Baffle Step Compensation

Khron · 15th April 2006, 10:02 PM

Ok, i've seen what a line-level BSC circuit can do (as per Rod Elliott - sound.westhost.com ), but i'm real curious.. Does a passive BSC do the same thing? i.e. attenuate sound above a certain frequency in a shelf manner.

David Gatti · 16th April 2006, 11:54 AM

yes, absolutely.

Khron · 16th April 2006, 01:51 PM

http://zaphaudio.com/audio-speaker12.html

In this design, Mr Krutke says he has about 4.5dB of BSC on the woofer. But all he has in the woofer crossover is the inductor (1st order low-pass) and the LC notch filter (for the 8KHz breakup node).

I'm getting a tad confused

Davey · 16th April 2006, 02:29 PM

Khron,

The woofer driver is a complex impedance and judicious design with a minimal number of components can still yield the desired BSC curve. Take a look at the graph labeled "woofer filter effect." This shows the actual drive to the woofer and the shelving effect between 200-2000Hz that John was targeting.

You'll see this kind of thing a lot with well-designed crossover networks......the actual topology might not look "generic" (or what you'd expect) but it still accomplishes the goal.

Cheers,

Davey.

Khron · 16th April 2006, 08:23 PM

Thanks Davey, that does make sense

15th April 2006, 10:02 PM	#1
Khron diyAudio Member Join Date: Jul 2005 Location: Finland	Baffle Step Compensation Ok, i've seen what a line-level BSC circuit can do (as per Rod Elliott - sound.westhost.com ), but i'm real curious.. Does a passive BSC do the same thing? i.e. attenuate sound above a certain frequency in a shelf manner.

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16th April 2006, 11:54 AM	#2
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	yes, absolutely.

16th April 2006, 01:51 PM	#3
Khron diyAudio Member Join Date: Jul 2005 Location: Finland	http://zaphaudio.com/audio-speaker12.html In this design, Mr Krutke says he has about 4.5dB of BSC on the woofer. But all he has in the woofer crossover is the inductor (1st order low-pass) and the LC notch filter (for the 8KHz breakup node). I'm getting a tad confused

16th April 2006, 02:29 PM	#4
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	Khron, The woofer driver is a complex impedance and judicious design with a minimal number of components can still yield the desired BSC curve. Take a look at the graph labeled "woofer filter effect." This shows the actual drive to the woofer and the shelving effect between 200-2000Hz that John was targeting. You'll see this kind of thing a lot with well-designed crossover networks......the actual topology might not look "generic" (or what you'd expect) but it still accomplishes the goal. Cheers, Davey.

16th April 2006, 08:23 PM	#5
Khron diyAudio Member Join Date: Jul 2005 Location: Finland	Thanks Davey, that does make sense