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Old 12th May 2010, 09:48 AM   #1141
vadi is offline vadi  Austria
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Hi David,

I wanted to give you some feedback too:

I find it a bit confusing that you have to recalculate a record if you want to see SPL after you calculated the max SPL.

Could impulse response be shown again without recalculating it after you close its window?
Since it's used so much for subwoofers (and I can't get Homlimpulse to import my stuff) an optional highpass and lowpass would be great! Maybe a single parametric EQ too?

Sometimes it's confusing when you want to compare records. Multiple memory slots for comparing could be handy.

Best regards,
Sladi
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Old 12th May 2010, 11:44 AM   #1142
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To show the normal record you just empty one field in max SPL tool.
Same with combined response and directivity.

To get hi and low pass you have to export it to AkAbak.

Regarding the max SPL tool I think I found a bug.
Here you can see it with 7mm and 400W. Eg was adjusted to fit inside yet as you see gets way more power than it should.
Click the image to open in full size.

There are also some difference between SPL tool and what I calculate.
44V and 2.8807Ohm is 672.06W. Tool says 664.3595W.

There are also some difference when exporting.
At 20Hz I get:
SPL sample tool says 88.3379W
Ohm is 10.0828 (according to sample tool) and 10.4188 when exported.
That gives 192W and 141.84W at 44V.
I tried to factor in phase but none of it made sense ether.

Did I do something wrong or do I simply not get it?

Any way we can get electrical phase when exporting?
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Old 12th May 2010, 03:18 PM   #1143
GM is offline GM  United States
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Quote:
Originally Posted by David McBean View Post
Thanks again for your valuable feedback - identifying the cause of the problem for me (non-zero Rg) made things just that much easier.
Greets!

You're welcome! Thanks for the continuing efforts and yes, no goofy looking plots or at a glance notice any other obvious data mismatches.

GM
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Old 13th May 2010, 06:56 AM   #1144
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Hi Sladi,

Quote:
Originally Posted by vadi View Post
I find it a bit confusing that you have to recalculate a record if you want to see SPL after you calculated the max SPL.
As David_Web has indicated, a blank input field in the Maximum SPL tool will cause the normal SPL response to be re-displayed. With one of the input fields highlighted, simply press the backspace key and then click the OK button.

Quote:
Originally Posted by vadi View Post
Could impulse response be shown again without recalculating it after you close its window? Since it's used so much for subwoofers (and I can't get Homlimpulse to import my stuff) an optional highpass and lowpass would be great! Maybe a single parametric EQ too?
Showing the impulse response again without recalculating it could become confusing, as other tools available from the SPL Response window can alter the impulse. I think it is probably safer to leave things as they are :-). I have no plans to add any filtering or equalisation functionality to the Impulse Response tool.

Quote:
Originally Posted by vadi View Post
Sometimes it's confusing when you want to compare records. Multiple memory slots for comparing could be handy.
Sorry, no memory slots - it all gets too complicated :-). Being able to capture / release a particular set of results for comparison purposes should be sufficient in most cases. Temporary memory slots are of course already provided with the Loudspeaker Tool.

Kind regards,

David
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Old 13th May 2010, 07:14 AM   #1145
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Quote:
Originally Posted by David_Web View Post
Regarding the max SPL tool I think I found a bug.
Hi David_Web,

To allow me to investigate further could you please provide a screenprint of the input parameters window for your test example. Many thanks.

Kind regards,

David
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Old 13th May 2010, 07:26 AM   #1146
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Quote:
Originally Posted by David_Web View Post
Any way we can get electrical phase when exporting?
Hi David_Web,

Select File > Export > Ze + Phase... from the Electrical Impedance window.

Kind regards,

David
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Old 13th May 2010, 07:32 AM   #1147
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Quote:
Originally Posted by GM View Post
Thanks for the continuing efforts and yes, no goofy looking plots or at a glance notice any other obvious data mismatches.
Hi GM,

Excellent :-).

Incidentally, I have just found another bug inadvertently introduced as a result of the recent set of changes to the program - the second-harmonic distortion figure given in the Sample results is no longer correct.

This will be fixed in the next release, after I have investigated the issues raised above by David_Web.

Kind regards,

David
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Old 13th May 2010, 09:15 AM   #1148
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Neat, I thought you already got everything when exporting from SPL window.

The max SPL tool was a user error. I think.
Forgot I had two drivers in parallel.
The tool is per driver right? Although I have seen users putting the combined power of all drivers when using it.

Ill attach record later if you still need it.
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Old 13th May 2010, 12:58 PM   #1149
GM is offline GM  United States
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Quote:
Originally Posted by David McBean View Post
Incidentally, I have just found another bug inadvertently introduced as a result of the recent set of changes to the program - the second-harmonic distortion figure given in the Sample results is no longer correct.
Greets!

I don't pay any attention to distortion figures, but I see what you mean, a proven high SQ hypex horn design I've built calcs a >100% 2HD.........

GM
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Old 13th May 2010, 04:00 PM   #1150
GM is offline GM  United States
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DMB,

Is there any free space where a field could be added to input a driver's published Pe, Xmax for reference, or better yet, let it auto calc a max SPL plot same as WinISD Pro does?

TIA,

GM
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