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Celestion CX 2012 Speaker Enclosures


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So I've managed to purchase a pair of Celestion CX 2012 Co-axial De Luxe Studio Series speakers made in England in the 1960s. 12 inch, 20W, 15 Ohms.

 

I had hoped to be able to use these speakers to replace the Goodmans TwinAxiom 10 Twin concentric speakers in a custom made tuned enclosures. But the Celestion drivers are too big for the enclosure. Thus I need a design for a suitable enclose for the Celestion CX2012 speakers.

 

Celestion published two designs for speaker enclosures in the 1960s, but I suspect there would be more appropriate enclosure design for the Celestion CX 2012 Co-axial speakers that could be used. Does anyone know of where to look, or who could help me out, coming up with such speaker enclosures.

celection-cx2012-enclosures.jpg

celection-cx2012-speakers.jpg

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From past experience with these speakers an enclosure based on the T & S parameters would be better than relying  on the  manufacturer's designs. Be warned, it needs to be quite large.  The crossover network  is  simply a capacitor and a pot for the shallow horn tweeter and it is worthwhile to use  a more sophisticated  design.

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I found some old measurements for the CX2012.                   Fs               35 Hz                                              B.l      19.79  T.m

                                                                                                             Vas            208.6 L                                         dBspl   96.83

                                                                                                               Re             12.88  ohm                                    no       2.9031  %          

                                                                                     

                                                                                                             Qms             5.1359                                           Mms   40.872 g

                                                                                                              Qes              0.2955                                          Cms       1.49E-6 m65/N 

                                                                                                              Qts               0.2794                                         L 1kHz    1.1866  mH

 

 From these parameters and allowing for normal losses and solid parts within the enclosure, a fourth order Butterworth enclosure  of an effective internal volume of 197 litres would be a good  match  for the Celestion  12'' speaker.

                                                                                                             

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2 hours ago, VanArn said:

From these parameters and allowing for normal losses and solid parts within the enclosure, a fourth order Butterworth enclosure  of an effective internal volume of 197 litres would be a good  match  for the Celestion  12'' speaker.

                                                                                                             

Many thanks. Any idea as to where I could get such a design and someone to make it for me?

 

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If you can find a build sheet I can build them for you. 

 

Just put a finishing coat on some Altec Lansing 846b Valencia's that I built for another member. I will update the thread once I reassemble them next week. Volume 240lts, close to what has been suggested for your Celestion's 

 

I also have some 12" Celestion's in the way of the Ditton 44's I'm about to build new enclosures for them, did a quick volume calc and they are 73lts 

 

bummer your in Rye 

 
Edited by Powerglide
lt spec wrong
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I'm no speaker tec, but can't see why this design would not be compatible with your drivers. 

 

https://www.stereo.net.au/forums/topic/298469-onken-jensen-ultraflex-with-altec-and-jbl-horns/?tab=comments#comment-4435273

 

One thing I do know is they work effortlessly and were a relatively easy built 

 

If interested I'm sure the OP,er would do the calcs and work out the sizes.

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