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Reduce mouth resonance in horn
Reduce mouth resonance in horn
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Old 11th December 2018, 09:12 PM   #11
xrk971 is online now xrk971  United States
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Reduce mouth resonance in horn
Quote:
Originally Posted by tapestryofsound View Post
I hear what you say, only I have difficulty visualising it. Semantics, and my lack of intelligence, probably

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For example, take this fictitious BLH and let’s assume you have a pesky 175Hz peak, adding a 19in long stub helps to absorb this peak by 3 to maybe 6dB depending on location and stuffing used.
Reduce mouth resonance in horn-d72dd4a7-c5cf-42a7-9cba-9821af6fc172-jpeg

Putting stub entrance near excitation throat helps.
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Last edited by xrk971; 11th December 2018 at 09:15 PM.
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Old 11th December 2018, 10:36 PM   #12
Soldermizer is offline Soldermizer  United States
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A stub (Helmholtz resonator?) in a horn would be so effective it would remove desired program content at the tuned frequency.
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Old 11th December 2018, 10:50 PM   #13
xrk971 is online now xrk971  United States
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Reduce mouth resonance in horn
That’s why you adjust it so that the attenuation makes it neutral. It can all be simulated in some horn programs, like Akabak.
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Old 12th December 2018, 01:35 AM   #14
tapestryofsound is offline tapestryofsound  Scotland
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Quote:
Originally Posted by xrk971 View Post
For example, take this fictitious BLH and letís assume you have a pesky 175Hz peak, adding a 19in long stub helps to absorb this peak by 3 to maybe 6dB depending on location and stuffing used.
Click the image to open in full size.

Putting stub entrance near excitation throat helps.
Ah, now I see and understand exactly what you mean! I am very much in favour of what I call 'mechanical eq' through construction - even though I use a (very nice) guitar eq pedal with my present mono horn playback.

Thank you for making a proper drawing for me, it is the kind of thing that sticks and stays for me. I'm going to keep this very much in mind for my next build.

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Old 12th December 2018, 01:45 AM   #15
GM is offline GM  United States
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FYI/FWIW, part C. Band-stop filters: http://users.cms.caltech.edu/~ps/All.pdf

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Old 12th December 2018, 02:05 AM   #16
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Danley Sound Labs' DTS20 tapped horn with dual resonators made from PVC pipe components to smooth out its HF 'out-of-band'/phase response:

GM

Click the image to open in full size.

Click the image to open in full size.
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Old 12th December 2018, 03:26 AM   #17
GM is offline GM  United States
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Quote:
Originally Posted by tapestryofsound View Post
I am very much in favour of what I call 'mechanical eq' through construction -
+1, one of my design 'mantras' is the pioneer's 'acoustical solutions to acoustical problems'.

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Old 12th December 2018, 06:10 AM   #18
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by Soldermizer View Post
I like the idea of building McBean's infinite horn
I'm not sure that you would like the response below cutoff very much, though :-).
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Old 12th December 2018, 09:53 AM   #19
cowanaudio is offline cowanaudio  Australia
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Reduce mouth resonance in horn
If the horn is going to be infinite, just give it a 10Hz flair rate. There, no subwoofer required. It would actually be smaller than the infinite 100Hz horn too!
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Old 12th December 2018, 12:04 PM   #20
Soldermizer is offline Soldermizer  United States
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I was lying in bed last night and it occurred to me: the stub/Helmholtz won't solve our problem! Yes, it would be good to reduce (say) a 1000 Hz peak. But the mouth reflection issue is one of delay (time) of the entire signal leaving the horn. Per Bouska and others, the distortion is a low-passed and multiply time delayed alternately inverted/not inverted delay of the signal.
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