ATC SB75-150SL—EsotarT330D—Kef 139B - diyAudio
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Old 24th April 2012, 09:55 AM   #1
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Default ATC SB75-150SL—EsotarT330D—Kef 139B

Thinking of DIY my dream speakers using:
1.ATC SB75-150SL.Bass-mid
2.EsotarT330D-Tweeter
3.Kef 139B-SP1333-as passive radiator

The enclosure in mind is cloning the Extrema following the details given by bfard Sonus Faber Extrema
but as for the Xover,I would like to have your precious inputs and suggestions from those who are experience in this field.
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Old 24th April 2012, 04:25 PM   #2
sreten is offline sreten  United Kingdom
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Hi,

If using a normal driver as an ABR you can adjust bass damping
by connection its terminals to different resistors down a short.

The KEF really doesn't have impressive excursion numbers for linear
excursion or damage limited excursion and is not ideally suitable IMO.

http://www.tb-speaker.com/detail/1208_03/w8q-1071f.htm

Click the image to open in full size.

Is a lot more like it IMO, and probably has better matching specs to the ATC driver.

rgds, sreten.
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Old 24th April 2012, 05:05 PM   #3
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sreten,
Thank you for your recommendation.
I might get a pair as well to see final result.
Anyway have you try this before using as a passive radiator?
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Old 24th April 2012, 05:49 PM   #4
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Quote:
Originally Posted by Mikewong View Post
Thinking of DIY my dream speakers using:
1.ATC SB75-150SL.Bass-mid
2.EsotarT330D-Tweeter
3.Kef 139B-SP1333-as passive radiator

The enclosure in mind is cloning the Extrema following the details given by bfard Sonus Faber Extrema
but as for the Xover,I would like to have your precious inputs and suggestions from those who are experience in this field.
First of all those dynaudio tweeters are no longer IMO a great value.

As far as a crossover you will need a (calibrated) measurement microphone to measure the acoustic response IN-baffle, an impedance measurement tool such as Smith and Larson Woofer Tester, and software such as ARTA and Jeff Bagby's Passive Crossover Designer. Once you've got these measurements we can help you further.
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Old 24th April 2012, 06:27 PM   #5
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The cross over in mind is as followed:
The Cross over point:2800Hz
Mid-Bass--2nd order Butterworth
Tweeter--1st order Butterworth or 3rd order Butterworth
I am totally a novice in this field.

BTW I have a used pair T330D at hand,
my first impression of the music played through them is beyond my expectation.

Last edited by Mikewong; 24th April 2012 at 06:34 PM.
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Old 24th April 2012, 06:42 PM   #6
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Quote:
Originally Posted by Mikewong View Post
Thinking of DIY my dream speakers using:
1.ATC SB75-150SL.Bass-mid
2.EsotarT330D-Tweeter
3.Kef 139B-SP1333-as passive radiator

The enclosure in mind is cloning the Extrema following the details given by bfard Sonus Faber Extrema
but as for the Xover,I would like to have your precious inputs and suggestions from those who are experience in this field.
Isn't that the scm12/19/20 drive unit?
I thought this was exclusive to complete ATC speaker systems only?

If it is then closed box alignment is the best treatment for this driver.
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Old 24th April 2012, 06:56 PM   #7
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The Mid-bass is the one from the SCM20SLPro which I owned.
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Old 24th April 2012, 06:59 PM   #8
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I suggest you go active 4th order. Cross low to a bass driver such as Sreten has suggested, but run as a three way, seperate compartments. 100hz for the bass. The SCM20 is capable of pleasing bass extension and control by itself. I have used these speakers.

Another option would be a Linkwitz transform on the bass mid if you want to go deeper and do not need massive spl's.

Last edited by rob g; 24th April 2012 at 07:10 PM.
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Old 24th April 2012, 08:02 PM   #9
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In fact I do think of going active to explore the full potential of this combination.
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Old 24th April 2012, 08:09 PM   #10
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Hello.
????????Sonus faber EXTREMA???? | Hi Fi?? (Hi Fi Review) pic1
Sonus Faber Extrema loudspeaker Measurements | Stereophile.com pic2
Quote:
Yes, and there is only 3 components. Two coils and one resistor. The woofer has a big coil and the tweeter has first a series resitor (~20Ohm says stereophile) to pad it down and to give impedance for the parallel coil which is the high-pass for the tweeter.
Sonus Faber Extrema
Various, SPECIFICATIONS
Sonus Faber Extrema
Mid-woofer Audio Technology AudioTechnology by Skaaning
Tweeter Esotar T330/SF Dynaudio
Low Bass B 139 Kef
Have fun.
Attached Images
File Type: gif 0. Sonus Faber Extrema.gif (44.9 KB, 77 views)
File Type: jpg Fig.1 Sonus Faber Extrema, anechoic response.jpg (29.6 KB, 73 views)
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