Celestion Ditton 66 Brochure

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DITTON

sound forpe ection;

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Arranging your loudspeakers for
good listening . . .

The optimum placement of your
loudspeakers is somewhat dependant
upon room acoustics and furniture
siting. However. the basic arrangement
for stereo reproduction is obtained by
having the two speakers about three
metres apart angled at approximately
45. If your speakers are placed in the
corners of your room this will tend to
accentuate the bass notes. If the room
acoustics tend to produce a stronger
bass than required, a small plinth
allowing some space between the
underside of the speaker and the floor
may be preferred. Ouadraphony: a
pair of Ditton 15's would be an ideal
match for the rear channel or if space
is critical the miniature Ditton 11.

It is suggested that the rear channel
speakers be sited near ceiling height.
Enthusiasts report fantastic
quadraphony using four 66'Monitorsl
Frequency response curve and
polar dispersion diagram

These diagrams are reproduced for the
interest of the technically minded;

the diagram on the right shows
frequency response; the upper

limit of the trace is of course that of
the laboratory equipment; the
uniformity of this curve speaks
volumes for the excellence of the drive
units and of the crossover developed
by Celestion engineers. It is hardly
surprising that Celestion pressure units
are specified by the B.B.C. for both
studio and domestic monitors and also
incorporated by many manufacturers
The polar diagram below depicts

the relative response at selected
frequencies through a radius of 360'.
obtained by rotating the loudspeaker
in an anechoic chamber whilst
applying precisely regulated input
signals and recording the output from
the loudspeaker using a fixed calibrated
microphone and automatic curve
tracing equipment. It will be noticed
that even the highest frequencies are
well maintained through an arc of
120', ensuring an excellent stereo
effect over a wide listening area.
Meticulous design of the flush-
mounted HF 2000 super tweeter and
precise integration with the MD 500
midranga unit ensures this exceptional
performance.

DITTON

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3'

SPECIFICATION
Dimensions: 40 x 15 x 11} inches
100cm x 13ch x 29cm
Internal Volume: 75 litres
Nett Weight: 30 kg. 66 lbs.
Impedance: 4 - 8 ohm amplifier
matching
Amplifier Requirements:
10 - 160 watts RMS

Frequency Response:
Overall: 18 Hz. - 40 kHz.

Specific: 50 Hz. - 25 kHz. 1 4 as
+ 4da
4OHL--35kHL__10dB

System Resonance: 20 Hz.

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Crossover Frequencies:
500 Hz. and 5 kHz.
Power Ratings:
(1) Maximum Rated Power - 160

watts programme (without clipping)

(2) Continuous Sine Wave Rating

20 volts . 20 Hz. - 500 Hz. -
16 volts 500 Hz. - 3.8 kHz.
7 volts 3.8 kHz. -- 20 kHz.

Sensitivity: 4.8 watts pink noise input
produces 90 dB SPL at one metre in
anechoic conditions

Harmonic Distortion: at 96 dB SPL
0.6% at 100 Hz. 0.6% at 400 Hz.
0.7% at 1 kHz. 0.7% at 4 kHz.
0.9% at 10 kHz. 1.1% at 15 kHz.

Finishes: Teak or Walnut

The Celestion policy is one of continuous improvement and the Company reserves the right to modify specifications wrthout notice.