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Here is the Celestion CDX1-1445. Not a “price is no object” unit, but nevertheless an interesting offering from Celestion.

It has a PETP diaphram (a kind of polymer resin of the polyester family )

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Main advantage of polymer diaphram is unlike metal, they exhibit self damping characteristic and usually have no abrupt breakup mode. Do not think that the dome operate in pure pistonic mode, it is not, it just behave nicer.

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1425.JPG
Factory specification
CDX1-1425, Aluminium dome
Clear breakup seen above 15kHz
1445.JPG
Factory specification
CDX1-1445, Polymer dome
No breakup seen above 15kHz
Only a small anomaly at 11khz

Below is my measurement of the CDX1-1445 at 30CM with no equalization or smoothing.

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Mounting is on a Faital PRO STH1000 tractrix profile with 1400 Hz cut-off.

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One can also see the same anomaly at 11 kHz as per original specification.

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Not so bad for the kitchen system. Very high efficiency and good dynamics come to mind.

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Crossover points are:

  • SB34 12": 16 Hz - 45 Hz (94 dB). The efficiency of 94 dB is due to dual parallel subwoofers per side.

  • PD154 15": 45 Hz – 300 Hz (99 dB)

  • PR65Neo 6.5": 300-2khz (97 dB)

  • CDX1: 2kHz – 20 kHz (107dB)

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I do miss the high extension of the previous beryllium tweeter, but integration between those drivers is very good.

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Here’s the DATS of the 1445.

 

The unit is well burned in.

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