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Old 28th August 2011, 11:27 PM   #2191
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Not sure what you're telling me, but you add drivers using the 'driver arrangement' tool for multiple drivers, then use the 'combined response' tool. I had no problem doing eight drivers [4s+4p], though it did warn me that Sd was 16x larger than S1. 10+10 gave me a '9 in series' limit error, but when I tried nine in series it gave me a runtime error I didn't have time to read before it shut down HR, so something's amiss in River City...........

If you mean you're simming one speaker and using the 'multiple speakers' tool in the SPL response window, then it adds it all, so the only real difference in the plots would be how all the mutual coupling affects its response which may, may not be all that obvious.

GM
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Old 28th August 2011, 11:29 PM   #2192
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Quote:
Originally Posted by dirkwright View Post
Does anyone know what causes this ringing in the impulse response? How do I get rid of it?
IIRC it has to do with reflections back to the throat, so only an infinite horn can be completely damped without 'cheating' a bit.

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Old 29th August 2011, 12:17 AM   #2193
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Quote:
Originally Posted by GM View Post
IIRC it has to do with reflections back to the throat, so only an infinite horn can be completely damped without 'cheating' a bit.

GM
OK, but I didn't have them when I was playing with another horn. This is a hyp-ex. I can't duplicate my previous results now that didn't have any ringing. dang it.

Last edited by dirkwright; 29th August 2011 at 12:20 AM.
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Old 29th August 2011, 03:06 AM   #2194
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I was going to say that none of the tractrix I've simmed for others [only one built AFAIK] were ring free, though don't recall ever seeing an impulse measurement of one, so don't know how well they actually do.

Regardless, it's no big deal, damping the mouth or using a foam plug like Dr. Geddes promotes works well enough.

GM
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Old 29th August 2011, 06:39 AM   #2195
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Originally Posted by dirkwright View Post
Why is it not possible to increase the window size?
Hi dirkwright,

Because I like to keep things as simple as I can :-).

Kind regards,

David
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Old 29th August 2011, 06:51 AM   #2196
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Quote:
Originally Posted by dirkwright View Post
Does anyone know what causes this ringing in the impulse response?
Hi dirkwright,

Could you please post a copy of the loudspeaker system input parameters. Thanks.

Kind regards,

David
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Old 29th August 2011, 06:54 AM   #2197
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Originally Posted by mashaffer View Post
I was modeling a TL enclosure and wanted to mess around with multiple drivers so I changed the number of drivers but nothing changed.
Hi Mike,

Could you please post a copy of the loudspeaker system input parameters. Thanks.

Kind regards,

David
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Old 29th August 2011, 07:02 AM   #2198
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Originally Posted by GM View Post
but when I tried nine in series it gave me a runtime error
Hi GM,

Nine drivers connected in series should work just fine.

I think it must be your weird computer playing up again :-).

Kind regards,

David
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Old 29th August 2011, 02:01 PM   #2199
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Originally Posted by David McBean View Post
Hi dirkwright,

Could you please post a copy of the loudspeaker system input parameters. Thanks.

Kind regards,

David
There you go. I used your system designer. As far as I know the driver parameters are accurate. It's a B&C 12PE32. The horn is a 1/2 size 100Hz hyp-ex.
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File Type: jpg 12PE32 100Hz input.JPG (57.6 KB, 74 views)
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Old 29th August 2011, 02:03 PM   #2200
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Quote:
Originally Posted by GM View Post
I was going to say that none of the tractrix I've simmed for others [only one built AFAIK] were ring free, though don't recall ever seeing an impulse measurement of one, so don't know how well they actually do.

Regardless, it's no big deal, damping the mouth or using a foam plug like Dr. Geddes promotes works well enough.

GM
Do you damp the mouth with shag carpet like Bruce Edgar once suggested?
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