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Old 29th August 2011, 02:05 PM   #2201
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Here's the group delay for the same horn.
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File Type: jpg 12PE32 100Hz group delay.JPG (40.3 KB, 149 views)
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Old 29th August 2011, 04:23 PM   #2202
blo06 is offline blo06  France
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Originally Posted by dirkwright View Post
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.

Hi dirkwright,
what do you call "1/2 size horn" ?

Cheers.
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Old 29th August 2011, 05:50 PM   #2203
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Hi dirkwright,
what do you call "1/2 size horn" ?

Cheers.
It's the same as half space.
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Old 29th August 2011, 07:39 PM   #2204
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Originally Posted by GM View Post
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
Yes I run a simulation for one driver and then go to the arrangement tool and select the number of drivers I tried 2 in series and 8 in series. I then run the simulation again by pressing the calculate button again without changing the dimensions of the line at all. I would expect a very over damped result but I see no changes. I am using the combined response of course since I am doing a TL.

Interestingly enough if I use the loudspeaker wizard and make all of the changes in there it works exactly as I would expect it to except that when I save and exit the wizard the input parameters page is not updated with the new information.

If instead of using the wizard I manually change the ND with the driver arrangement tool and manually change the area figures for the line segments and run the simulation in the normal way then I get the horribly under damped response that you would expect of a line designed for 8 drivers with only one driver present.

I am running in wine under Ubuntu so maybe there is some glitch there. I know that there are some other issues under this system as I can not use the segment wizard because it causes HR to crash.

Of course this is not a critical problem since we know how to expand a single driver design and I can even simulate it as long as I use the loudspeaker wizard.

Just an interesting data point. It is possible that some of my difficulties (segment wizard crash) may be memory related since I only have 348M RAM and that has to run both the host OS and wine and HR. Might be asking a bit much. Unfortunately all memory slots are full. Need to get me a new Intel machine some day as memory is hampering my virtual organ aspirations as well.
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Old 30th August 2011, 12:44 AM   #2205
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I think it must be your weird computer playing up again :-).
Greets!

I've a different one now, the other one did turn out to be truly weird before the motherboard quit working altogether due to the BIOS apparently slowly disintegrating.

GM
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Old 30th August 2011, 12:50 AM   #2206
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Do you damp the mouth with shag carpet like Bruce Edgar once suggested?
No, my main speaker building 'career' had been over for over a decade before I ever heard of him on one of the audio BBs.

GM
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Old 30th August 2011, 05:44 AM   #2207
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There you go.
Hi dirkwright,

Thanks for the additional information. The 'ringing' you are seeing in the impulse response is due to rear chamber resonances. Impulse response is (of necessity) always calculated assuming resonances are unmasked, even when the masked option is selected. To remove the ripples, either set Fr and Tal to non-zero values (eg Fr = 40 and Tal = 10) or set Lrc to a small value, say 1 cm.

Kind regards,

David
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File Type: png Compare.png (15.8 KB, 136 views)
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Old 30th August 2011, 05:54 AM   #2208
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Originally Posted by dirkwright View Post
Here's the group delay for the same horn.
Hi dirkwright,

Setting Fr and Tal to non-zero values or Lrc to a small value will also tidy up the group delay.

Kind regards,

David
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File Type: png Compare.png (23.8 KB, 134 views)
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Old 30th August 2011, 06:07 AM   #2209
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Originally Posted by mashaffer View Post
Yes I run a simulation for one driver and then go to the arrangement tool and select the number of drivers I tried 2 in series and 8 in series. I then run the simulation again by pressing the calculate button again without changing the dimensions of the line at all. I would expect a very over damped result but I see no changes. I am using the combined response of course since I am doing a TL.
Hi Mike,

It sounds to me that it is probably about time you tried another computer :-).

Kind regards,

David
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Old 30th August 2011, 06:14 AM   #2210
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Originally Posted by David McBean View Post
The 'ringing' you are seeing in the impulse response is due to rear chamber resonances.
I should have blown up the thumbnail, I thought he was referring to the pulse's ripple.

GM
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