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Best Midwoofer in Dipol-Configuration
Best Midwoofer in Dipol-Configuration
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Old 25th January 2021, 02:13 PM   #1
Tou is offline Tou  Germany
diyAudio Member
 
Join Date: Dec 2011
Default Best Midwoofer in Dipol-Configuration

Hi,

we have many some threads about the best selection of a dipol-tweeter with measurements of the polar pattern incl. backside. (for example in this thread: On the directivity of dipole tweeters)

But whats about the MF? The backside radiation pattern of the mids that i have seen do make some hickups and dont make a perfect dipol8 over the complete midrange.

So the goal of this thread is to make a list over some drivers for the midrange (200Hz-4khz). What is the usable frequency range for a good 8-dipol pattern for every driver (Backside and Frontside)?


Probably we can get some nice driver combinations....

Best regards, Tomas


UPDATE 26.01.21:

Driver List in dipol configuration:

2" Visaton FRS5X usable 1,5-4,5 khz
(Frontside Backside Pattern: https://www.diyaudio.com/forums/atta...front-rear-gif)

3" TC9FD18 usable 1,5-2,5khz
(Frontside pattern: https://www.diyaudio.com/forums/atta...olars-0-90-png
Backside pattern:
https://www.diyaudio.com/forums/atta...ars-90-180-png)

4" Audax HM100Z0 usable till 1,5khz
(Frontside Bacside Pattern:
https://www.diyaudio.com/forums/atta...s-124-vert-jpg)

4"Peerless HDS PPB 4-25/08 (HDS-P830870) usable till 1,7 khz
(Frontside Backside pattern:
http://www.diy-hifi-forum.eu/forum/a...1&d=1298815177)

...


Driver List in dipol configuration without measurements:

Scanspeak 15M/4624G00 used 250-2,5khz from kaameelis
(Akabak simulation MTM: https://www.diyaudio.com/forums/atta...624g00_mtm-png)

SB17CAC used till 1,5 or 2khz from CharlieLaub
(In Thread: In Pursuit of the 20-20k dipole)

Last edited by Tou; 26th January 2021 at 05:46 PM.
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Old 25th January 2021, 07:50 PM   #2
Tou is offline Tou  Germany
diyAudio Member
 
Join Date: Dec 2011
CharlieLaub recommended the SB17CAC.
Some dipole designs use the zaph za14.
What do you use? Do you have measurements of the backside?
They are sometimes hard to find....

One more:

3" TC9FD18 usable 1,5-2,5khz

(Frontside pattern: https://www.diyaudio.com/forums/atta...olars-0-90-png
Backside pattern:
https://www.diyaudio.com/forums/atta...ars-90-180-png)

Last edited by Tou; 25th January 2021 at 07:58 PM.
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Old 25th January 2021, 08:10 PM   #3
kaameelis is offline kaameelis  Estonia
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Join Date: Jul 2004
Location: home
Scanspeak 15M/4624G00 not the best but OK and not expensive. I us 2 of them on triangular baffle, 250-2.5kHz. MTM configuration, connected in series.
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Old 26th January 2021, 07:29 AM   #4
kaameelis is offline kaameelis  Estonia
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Join Date: Jul 2004
Location: home
I has no direct 15M/4624G00 polar plot measurements, but I has Akabak simulation on triangular MTM baffle at tweeter axis/level.
Attached Images
File Type: png 15M4624G00_MTM.PNG (294.1 KB, 106 views)
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Old 26th January 2021, 05:43 PM   #5
Tou is offline Tou  Germany
diyAudio Member
 
Join Date: Dec 2011
One more:

4"Peerless HDS PPB 4-25/08 (HDS-P830870) usable till 1,7 khz

Frontside Backside pattern:
http://www.diy-hifi-forum.eu/forum/a...1&d=1298815177
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Old 28th January 2021, 07:27 AM   #6
Tou is offline Tou  Germany
diyAudio Member
 
Join Date: Dec 2011
Is seemt, that we cam use the modst drivers till their cone breakup:

2" till 4khz
3" till 3khz
4" till 2khz

and so on...

But some of them have hickups in the LF. For example the frs5x at 1,5khz. Is it audible?

I took a look on some drivers till 3,5" and their distortion. The following drivers could ve very nice. Do somebody has the frontside or backside radiation pattern of them?

MCM 55-5650 !!!
Fr88EX
Faital Pro 3FE22/25
Dayton RS 75
Hivi B3N

Last edited by Tou; 28th January 2021 at 07:36 AM.
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