Zaph's B3S Design - Did I Make This Filter Right? - diyAudio
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Old 22nd February 2012, 10:38 PM   #1
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Default Zaph's B3S Design - Did I Make This Filter Right?

Decided to go from beginner to advanced beginner in speaker building. Made a build of Zaph's B3N design, tested it. Filter seems to make little difference (see graph attached.) Did I make the filter right? (see photo and circuit diagram) Or is it doing what it should?
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Old 23rd February 2012, 01:51 PM   #2
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How are you measuring? Looks like your circuit doesn't have the notch, just the BSC network. That's probably ok. Can you hear a difference?
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Old 23rd February 2012, 02:13 PM   #3
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I measured using an SPL meter at about 2ft in a small voice-over booth. There is a notch filter in Zaph's design too? I can't hear a difference.
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Old 23rd February 2012, 02:28 PM   #4
croat47 is offline croat47  United States
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Can not say for sure from your pic, but it looks like you wired the two component groups in parallel, not series? One lead coming into both at bottom of pic and one lead coming off each at top of pic? Shouldn't it be on lead coming into bottom of right, then leaving upper right to upper left, then leaving lower left to driver terminal?
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Old 23rd February 2012, 03:28 PM   #5
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Oh I see it better. Yes, he has it right. The notch is there.

If you can't hear a difference, don't use it. It's just sucking up output.

Looking at this: http://zaphaudio.com/audio-speaker18...elmatching.gif

I'd say the BSC might be useful. The notch, eh, not sure the 8khz peak is all that audible unless you're being very picky.

BTW, I don't think your measurements are giving you a clear picture. It seems to show the BSC circuit is working somewhat, but your SPL meter seems to roll off pretty early.
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Old 23rd February 2012, 03:31 PM   #6
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Ok, looking again. Are you sure that coil on the notch is only 0.08mH??? It looks the same size as the 0.8 sitting next to it. I think you might have missed that very important 0. Which might be why your output is down at high frequencies. Just scrap the notch (3 components on the left side of you picture).
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Old 23rd February 2012, 03:54 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

The notch filter is quite subtle. No way IMO is the BSC inductor 0.8mH
unless it has a core I can't see, BSC's effect would be seriously obvious.

rgds, sreten.
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Old 23rd February 2012, 03:56 PM   #8
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Quote:
Originally Posted by croat47 View Post
Can not say for sure from your pic, but it looks like you wired the two component groups in parallel, not series? One lead coming into both at bottom of pic and one lead coming off each at top of pic? Shouldn't it be on lead coming into bottom of right, then leaving upper right to upper left, then leaving lower left to driver terminal?
Sorry about the unclearness of pic - upper right comes in from terminal block on back of speaker, then into one component group, then at the bottom the 2 component groups are wired together, then out to driver terminal upper left.
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Old 23rd February 2012, 03:57 PM   #9
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Quote:
Originally Posted by tuxedocivic View Post
Oh I see it better. Yes, he has it right. The notch is there.

If you can't hear a difference, don't use it. It's just sucking up output.

Looking at this: http://zaphaudio.com/audio-speaker18...elmatching.gif

I'd say the BSC might be useful. The notch, eh, not sure the 8khz peak is all that audible unless you're being very picky.

BTW, I don't think your measurements are giving you a clear picture. It seems to show the BSC circuit is working somewhat, but your SPL meter seems to roll off pretty early.
Which one is the notch?
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Old 23rd February 2012, 03:58 PM   #10
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Quote:
Originally Posted by tuxedocivic View Post
Ok, looking again. Are you sure that coil on the notch is only 0.08mH??? It looks the same size as the 0.8 sitting next to it. I think you might have missed that very important 0. Which might be why your output is down at high frequencies. Just scrap the notch (3 components on the left side of you picture).
Aha! I missed a very important 0 indeed. There's one mistake. Thanks.
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