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Old 29th May 2008, 10:33 PM   #1
gnugear is offline gnugear  United States
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Default BSC for Bib?

I know that Bibs are meant for corner placement, but I like them pulled away from the back wall because the image depth is better. I'm thinking of adding a BSC between my amp and preamp as described in this bottlehead thread:

http://www.audioasylum.com/cgi/t.mpl...ehead&m=102309

They say to use a .033uf cap for baffles 8-9" wide. My Lowther Bibs are 11.75" wide. Does anyone know what value will work for that (I can't find any info other than "larger").
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Old 30th May 2008, 12:54 AM   #2
GM is offline GM  United States
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Assuming you haven't stuffed them to the point of 'killing' just about all its gain BW, its baffle width will be pretty much irrelevant since even away from the corners they should have enough gain to lower the baffle step considerably, so get a cheap 25 ohm pot from RS/whoever and some cheap small value caps and begin experimenting. Once dialed in, use a VOM to measure the pot's resistance and get some decent quality components to make the R/C filter.

GM
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Old 30th May 2008, 03:33 AM   #3
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Here is a quick online Baffle Step Compensation / Correction Circuit Calculator you can use. It follows Martin King's paper:

http://www.quarter-wave.com/General/BSC_Sizing.pdf
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Old 30th May 2008, 02:40 PM   #4
gnugear is offline gnugear  United States
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Results so far are very positive! There used to be a leaness to the sound (due to ripple?) that now sounds full and "correct" for lack of better words.
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Old 30th May 2008, 02:45 PM   #5
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Ripple is ripple, not leanness. Sounds like you've over-damped them if they don't have enough LF gain as-is.
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