measuring the celestion cdx1-1445

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 )

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.

Factory specification

CDX1-1425, Aluminium dome

Clear breakup seen above 15kHz

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.

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

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

cdx1-1445 frequency response

cdx1-1445

cdx1-1445 frequency response

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

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)

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

IMG_20180315_190610

IMG_20180315_190635

IMG_20180315_190610

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Here’s the DATS of the 1445.

The unit is well burned in.