Martin Audio CDD Series - IMPEDANCES; 70;100 V-LINE OPERATION

CDD USER GUIDE
CDD User Guide V1.0 44
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NOTE: To maintain the enclosure’s IP rating, the second gland must be of the same type as the pre-fitted one and of the correct
size for the hole.
IMPEDANCES
All CDD Series loudspeakers have an impedance of 8 ohms. (Model CDD5 only - see section below regarding 70/100 V-line
operation)
Subwoofer Models CSX112 and CSX118 have an impedance of 8 ohms
Subwoofer Models CSX212 and CSX218 have an impedance of 4 ohms.
70/100 V-LINE OPERATION (MODEL CDD5TX and CDD6TX ONLY)
Models CDD5 and CDD6 are also available as variant CDD5TX and CDD6TX 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.
CDD5TX-WR. CDD6TX-WR
SW Position
70V Line
100V Line
70V ine
100V line
1
Low impedance operation (8 ohms)
Low impedance operation (8 ohms)
2
3 W
6 W
6.5 W
12.5W
3
6 W
12.5 W
12.5 W
25 W
4
12.5 W
25 W
25 W
50 W
5
25 W
n/a
50 W
n/a
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 mm2 cable
• Over 30 m run – use minimum 4.0 mm2 cable