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CDD
USER GUIDE
IMPEDANCES
All CDD Series loudspeakers have an impedance of 8 ohms. (Models CDD5 and CDD6 only - see
section below regarding 70/100 V-line operation.)
Subwoofer Models CSX112-F and CSX118-F have an impedance of 8 ohms
Subwoofer Models CSX212-F and CSX218-F have an impedance of 4 ohms.
70/100 V-LINE OPERATION (MODELS CDD5TX-WR AND CDD6TX-WR ONLY)
Models CDD5 and CDD6 are also available as variants CDD5TX-WR and CDD6TX-WR respectively,
with a 70/100 V-line transformer fitted internally. In accordance with normal line system
practice, a rotary switch is provided to select the required power rating. An additional switch
position selects low-impedance operation (8 ohms).
The rotary switch is located on the front of the cabinet, so the grille needs to be removed to
access it. This has the advantage of allowing the power setting to be adjusted once the speaker
has been installed and correctly positioned.
High levels of low-frequency signals can cause transformer core saturation, which can cause
distortion and sounds unpleasant. If driving 70/100 V-line loudspeakers with bass-heavy
programme material at high levels, we strongly recommend that a high-pass filter is included in
the signal path. This can be easily implemented by the DX0.5 loudspeaker management system;
many industrial power amplifiers designed for 70/100 V-line operation will have selectable fixed
filters for this purpose. If such filters are not available in the amplifiers, they can be implemented
in the Loudspeaker Management System controller.
Cable specifications
Use good-quality, fine-stranded two-core speaker cable. Depending on the type of installation
and the system's application, local regulations may dictate the type of cable jacket to be installed
(e.g., low-smoke hazard).
The minimum gauge of cable to be used is determined by the length of cable run:
•
Up to 30 m run – use minimum 2.5 mm
•
Over 30 m run – use minimum 4.0 mm
CDD User Guide V1.1
CDD5TX-WR
SW POSN.
70 V-line
1
2
3 W
3
6 W
4
12.5 W
5
25 W
CDD6TX-WR
100 V-line
70 V-line
Low-impedance operation (8 ohms)
6 W
6.5 W
12.5 W
12.5 W
25 W
25 W
n/a
50 W
cable
2
cable
2
100 V-line
12.5 W
25 W
50 W
n/a
43
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