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Multi-Way Conventional loudspeakers with crossovers

Hi-End and Hi-Efficency loudspeakers (horn + onken)
Hi-End and Hi-Efficency loudspeakers (horn + onken)
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Old 30th October 2010, 05:16 PM   #301
Helmuth is offline Helmuth  Netherlands
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I try to work with arta but I have to study it.

In hobby box it is simple.
Click the image to open in full size.
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Old 30th October 2010, 06:01 PM   #302
Helmuth is offline Helmuth  Netherlands
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It seems arta can not measure shorter the 70msec.

Maybe give holmresponse a try.

HOLM Acoustics
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Old 30th October 2010, 06:03 PM   #303
doug20 is offline doug20  United States
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What do you mean ARTA can not measure shorted then 70msec? It can do < 1 msec. I gate measurements with ARTA down to 3 msec all the time.


btw, you have a nice software package! Too bad its not in English.
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Old 30th October 2010, 06:06 PM   #304
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by doug20 View Post
What do you mean ARTA can not measure shorted then 70msec? It can do < 1 msec. I gate measurements with ARTA down to 3 msec all the time.


btw, you have a nice software package! Too bad its not in English.
Show how you can gate 1msec.
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Old 30th October 2010, 06:25 PM   #305
a.wayne is offline a.wayne  United States
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Do you guys ever measure outside (gated or groundplane for eg) gating indoors below 800 hz is very difficult for accuracy , even if you have the speaker raised 1-2 M off the floor and a pretty large room...

Ok sorry , i see were you have Helmuth ......

Last edited by a.wayne; 30th October 2010 at 06:30 PM.
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Old 30th October 2010, 06:33 PM   #306
audiodesign is offline audiodesign  Italy
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doug20, how to do ?
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Old 30th October 2010, 11:17 PM   #307
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by audiodesign View Post
doug20, how to do ?
I found it.

Choose impulse response and you can choose custom gate.
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File Type: jpg arta.JPG (115.7 KB, 458 views)
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Old 31st October 2010, 08:08 AM   #308
audiodesign is offline audiodesign  Italy
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There is no big differences in the high frequency using 2, 5 or 20 msec.
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File Type: gif 2msec_for_high_freq.gif (24.9 KB, 435 views)
File Type: gif 5msec_for_mid_freq.gif (24.6 KB, 429 views)
File Type: gif 20msec_for_low_freq.gif (24.5 KB, 428 views)
File Type: gif freq_resp.gif (39.0 KB, 704 views)
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Old 31st October 2010, 10:04 AM   #309
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by audiodesign View Post
There is no big differences in the high frequency using 2, 5 or 20 msec.
That can be caused by the reflections on the baffle. I can see improvement with the 2 msec

Try now and measure with the microphone 10cm away from the tweeter and one 10cm away of the woofer and measure with about 3msec and 20msec.

and overlay them in a window.

When they are much more flat then you have to improve the shape of the baffle.

With this way of measurement (gating) you can tweak your design to the highest level.


Post a waterfall diagram looks very colour full in arta..
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Old 31st October 2010, 10:36 AM   #310
Helmuth is offline Helmuth  Netherlands
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clic here.

Measure also a step-response waterfall.

The spec of the 15 inch woofer aso shows a bit ragged response in the d range like your measurements show. This can mean you have to tweak the cone of your woofer.

Make cuts and place damping lines like scanspeak does. To break cone resonance.
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Last edited by Helmuth; 31st October 2010 at 10:59 AM.
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