70/100 V-Line Operation (Model Cdd5Tx Only); Cable Specifications - Martin Audio CCD5 User Manual

CDD
USER GUIDE

70/100 V-LINE OPERATION (MODEL CDD5TX ONLY)

Model CDD5 is also available as variant CDD5TX, 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).
SW POSN.
1
2
3
4
5
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
42
70 V-line 100 V-line
Low-impedance operation (8 ohms)
3 W 6 W
6 W 12.5 W
12.5 W 25 W
25 W n/a
cable
2
cable
2
CDD User Guide V1.0