Dynacord CXM15 - Brochure - Page 2

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D y n a c o r d C X M 1 5

TEST

quacy of sound pressure levels, are of grea-

ter or lesser importance. Since stage moni-

tors are usually operated at close range –

between one and three metres from the

performer – the sound should as far as pos-

sible radiate from a single source.

CXM 15

For the aforementioned reasons, the CXM

15 is conceived as a coaxial two-way sys-

tem. A further advantage of this constru-

ction is the reduced area of the front panel,

which makes the box more compact. The

two sides of the enclosure are angled at 33°

and 45°, the depth of the cabinet being 329

mm. These compact dimensions for a 15"

woofer indicate already that the box is not

necessarily optimized for deep bass repro-

duction, but this is in any case not what is

generally wanted in a stage monitor. The

size of the enclosure is clearly here the pri-

mary consideration. Genuine deep bass

reproduction on stage is only required, if at

production partner 12/09_01/10 special reprint

all, for the drum monitor, which can always

be complemented, should the need arise, by

a subwoofer or shaker.

With a weight of only 19 kg, the CXM 15 is

one of the lightweights in its class and is

wonderfully easy to handle. Particularly

practical are the integrated gripping edges

running all the way round both sides of the

enclosure. The recessed side panels accom-

modate three Speakon sockets, the acti-

ve/passive selector switch and an integra-

ted stand adaptor. Two of the Speakon

sockets are on the side with the stand adap-

tor and the third on the opposite side. This

means that whichever way the loudspeaker

is mounted, a short Speakon cable is all that

is needed to run the signal from box to box.

The socket for the stand reveals that the

CXM 15 can naturally also be used as a 'nor-

mal' full-range box or as the top box in a

small PA or even as a fill system.

Overall, the birch plywood enclosure with

its textured finish has a very robust look to

it and the same goes for the equally solid

front grille with its foam backing. The way

the front grille is attached here, with very

solid threaded screws, represents a great

improvement over the screw or clamp

designs you usually find. You can remove

and replace the grille umpteen times here

with no problems whatsoever. Depending

upon the type of show, monitors on stage

can be exposed to a considerable amount of

dirt, so it is important to be able to clean

the front panel regularly and swiftly.

When you unscrew the grille, the 15" chas-

sis with its coaxial high frequency horn

appears. The relatively large horn is positio-

ned extremely close to the diaphragm of

the 15" woofer. For the woofer, the horn

functions as a type of small-volume band-

pass chamber. Interference caused by the

sound radiating from the woofer dia-

phragm reflecting back off the horn is only

of relevance at very short wavelengths – in

other words, at high frequencies that are in

any case above the crossover frequency of

1,200 Hz. On the other hand, thanks to its

size, the directionality of the horn is already

so pronounced at the crossover frequency

that the woofer diaphragm lying behind it

is scarcely of any importance. The object of

this approach is to obtain greater control of

the sensitive midrange, which is otherwise

always a weakness with coaxial drivers.

And here, we can say at the outset, the

approach has proved successful.

If you unscrew the chassis, it is easy to

remove the driver with its two neodymium

magnets from the box. The saving of

weight that comes with the use of neody-

mium magnets is especially noticeable in

the case of coaxial systems with two dri-

vers in one chassis. Comparable chassis

with ferrite magnets usually weigh more

than the entire box does here.

Ac tive or passive ?

Once we have removed the driver, we get a

clear view of the crossover: the circuit

board contains two passive second-order

filters – a high-pass and a low-pass – as

well as a protective circuit for the tweeter.

The compact circuitry on the board calcula-

tes in the manner of a simple analogue

computer the RMS power received by the

high-frequency driver and opens a relay

whenever necessary (i.e. whenever there is