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Old 14th July 2009, 10:57 AM   #41
Elias is offline Elias  Finland
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Hello,

Here comes more measurement results Again the purpose is to study the room response of speakers having different radiation patterns.

I did several measurements in four locations A, B, C and D in the room. See the pic for positions.


I measured the following speakers:

- Monopole bass. One 12" element in a 100 litres closed box.

- Dipole bass. Two 12" elements in a H frame.

- Monopole bass-midrange. One 6.5" element in a 12 litres closed box.

- Dipole bass-midrange. One 8" element in a small open baffle.

- Dipole line array. Eight 6.5" elements in a vertical narrow baffle having height of 1.5 m.


The measurement signal is the same as before. It is a 5 cycle sinusoidal burst having Hanning envelope. Burst frequencies are spaced at 1/12 octave.


- Elias
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File Type: png paikat_geometria_a-b-c-d_da.png (12.2 KB, 587 views)
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Old 14th July 2009, 11:13 AM   #42
Elias is offline Elias  Finland
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At first, let's examine the frequency range of 20Hz-100Hz.

Here's the monopole bass room response:
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File Type: jpg monopolebass_a-b-c-d_spektrogram_20-100hz_da_resize_90.jpg (79.7 KB, 614 views)
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Old 14th July 2009, 11:18 AM   #43
Elias is offline Elias  Finland
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And here's the dipole bass:
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File Type: png h-dipolebass_a-b-c-d_spektrogram_20-100hz_da_resize.png (97.5 KB, 598 views)
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Old 14th July 2009, 11:29 AM   #44
Elias is offline Elias  Finland
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Here's the monopole bass envelope magnitude and envelope delay frequency responses.

The envelope magnitude is the maximum value of the envelope at the given frequency. The envelope delay is the delay the maximum value of the envelope occurs from the time point it should occur ideally. Zero envelope delay means envelope maximum is in the correct position with no additional delay.
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Old 14th July 2009, 11:30 AM   #45
Elias is offline Elias  Finland
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And here's the dipole bass envelope magnitude and envelope delay frequency responses:
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Old 14th July 2009, 08:20 PM   #46
cuibono is offline cuibono  United States
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Nice work, thanks for sharing!
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Old 14th July 2009, 09:08 PM   #47
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Thank you !

Would you care to provide some explanations, which area to look for and if there's any conclusions ?

Cheers!
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Old 14th July 2009, 11:56 PM   #48
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Are the dip[oles and monopoles equaized to have the same anechoic, on axis response?
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Old 15th July 2009, 08:48 AM   #49
Elias is offline Elias  Finland
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Hello,

Quote:
Originally posted by gainphile
Would you care to provide some explanations, which area to look for and if there's any conclusions ?
Yes, I'm planning to draw some conclusions some of which I think can be quite interesting, but first I have more data to present



Quote:
Originally posted by john k...
Are the dip[oles and monopoles equaized to have the same anechoic, on axis response?
The Envelope Mag frequency response curves ARE NOT equalised to be the same for different speakers. For the dipoles I use some slight 6dB/oct dipole correction only, but that is mainly to increase the dynamic range of the measurement.

The spectrograms ARE equalised mathematically so that at each frequency the maximum value of the envelope is referenced to 0 dB. That can be seen in the spectrogram pics where the max value has allways the same colour. I think this equalisation gives better view of the room temporal response since one can directly compare different speakers at different frequencies one to one.


- Elias
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Old 15th July 2009, 08:51 AM   #50
Elias is offline Elias  Finland
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To continue, let's move higher in frequency and look at the range of 20Hz to 2kHz.

First here's the monopole bass-midrange room response at different locations A, B, C and D:
Attached Images
File Type: jpg monopolemid_a-b-c-d_spektrogram_20-2khz_da_resize_80.jpg (83.8 KB, 407 views)
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