Measured monopole and dipole room responses - Page 32 - diyAudio
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Old 11th October 2012, 11:52 AM   #311
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Old 11th October 2012, 12:48 PM   #312
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And now I'd like to see such data for multiple locations in different rooms
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Old 11th October 2012, 01:21 PM   #313
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I would too....
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Old 11th October 2012, 01:42 PM   #314
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Originally Posted by StigErik View Post
The decay is not shorter. The length of the room decay is the same. Its the LEVEL of the roomdecay that is different.
This observation from the graphs by StigErik is the key evidence for the better transient response in a room from a dipole.

The room decay is a function of room acoustics and will be the same independent of the source. However if less sound waves reach the room boundaries, the SPL of the reverberant field is lower to start with for a bidirectional dipole as opposed to a monopole that is omnidirectional. So logically, the ratio of the direct to indirect soundfield higher for a dipole than a monopole. Higher direct sound equals to reduced room coloration...this is true for any speaker. That is why some listeners who prefer uncoloured sound in their rooms go for narrow directivity speakers like horn loaded ones. The only other way to reduce room colourations is to increase wall absorption. While room treatments work well and inexpensively for mid-high frequencies, it is not so for bass frequencies. So the only way to reduce the room colourations in the bass region is to get narrow directivity in the bass region....using a dipole bass unit !

Following the above line of thought, a monopole and a dipole should sound the same in open air or anechoic conditions. Unfortunately even that might not be true...as the backwave from a sealed monopole can never be completely absorbed (unless it is a rare long stuffed sealed TL) the unaccounted and un-simulatable stored energy from a monopole eventually comes out, smearing the sound envelope. In contrast, in a dipole all the energy is accounted for to a greater extent.
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Old 11th October 2012, 01:45 PM   #315
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Originally Posted by soundaatma View Post
This observation from the graphs by StigErik is the key evidence for ...
And this graph is the "key evidence" for what?

Click the image to open in full size.

Double Bass Array (DBA) - The modern bass concept!
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Old 11th October 2012, 02:11 PM   #316
Omholt is offline Omholt  Norway
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Originally Posted by markus76 View Post
And now I'd like to see such data for multiple locations in different rooms
You can't compare that to StigEriks' room anyway. Rooms are different. It would have to be in the same room, if it's going to have any meaning at all.

What we're seeing for sure are modal issues with both. Just as expected.

If one thinks he will get from here:
Click the image to open in full size.

To here:
Click the image to open in full size.

by going from monopole to dipole or with multiple subs, they are wrong. There's no free lunch here.
Attached Images
File Type: gif Untreated.gif (15.9 KB, 201 views)
File Type: gif Halfway treated.gif (10.7 KB, 200 views)

Last edited by Omholt; 11th October 2012 at 02:16 PM.
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Old 11th October 2012, 02:12 PM   #317
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You can't compare that to StigEriks' room anyway. Rooms are different. It would have to be in the same room, if it's going to have any meaning at all.
I didn't claim the opposite

What's the difference between the two rooms you've shown? Those plots don't look right.

Last edited by markus76; 11th October 2012 at 02:16 PM.
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Old 11th October 2012, 02:17 PM   #318
Omholt is offline Omholt  Norway
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Originally Posted by markus76 View Post
What's the difference between the two rooms you've shown? Those plots don't look right.
Same room and same speakers. Treatment is the difference.
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Old 11th October 2012, 02:42 PM   #319
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Same room and same speakers. Treatment is the difference.
That's obvious but what IS the difference (room size, source/receiver locations, treatments, etc.).

You're showing a 60dB range without any noise floor visible. That's uncommon.
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Old 11th October 2012, 03:37 PM   #320
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Quote:
Originally Posted by soundaatma View Post
Thanks Wavebourn.

BTW, why do you prefer arrays over single very high efficiency drivers, when comparable SPL can be reached by both in the home environment with no possibility comb filtering with the single driver. Unless you say that you used multiple high efficiency drivers in the array !!
I am tired from this "Comb filtering" myth...
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