User guide

& Z8

Installation and User Guide

22/10/04 V9

Wiring Multiple CPM Paging Microphones to a Z4 or Z8 Venue Mixer

In certain circumstances the Z4 and Z8 can power more than

one CPM microphone, refer to section 19 for more details.

The Z4 and Z8 mixers are compatible with general purpose

paging microphones that are fitted with close-contact switches

or open-collector switching devices. To open the paging

microphone channel on any zone the relevant zone access

switching terminal for that zone should be connected to 0V as

shown in the diagram opposite. If all access terminations are

permanently connected to 0V the paging microphone input will

function as general purpose microphone input.

12 Microphone Gain Control

Pre-set gain controls are provided adjacent to the respective

XLR input connector. The gain can be adjusted from 10dB to

50dB and this wide range of gain allows direct connection of high output devices such as

radio microphones without the need for additional attenuation. A high overload margin is

maintained at all gain settings.

13 Microphone Equalisation

Two-band equalisation is provided for both Mic 1 and Mic 2; the pre-set controls are

positioned alongside the input connector and gain control on the rear panel. The

characteristics of the equalisation is optimised for the tonal correction of speech signals and

the treble control (HF) provides

10dB at 5kHz with the bass control (LF)

10dB at 100Hz.

14 High Pass Filter

All three microphone channels feature high pass filters operating at 100Hz which provides

effective attenuation of breath blasts and low frequency handling noises. The circuitry

providing this feature is fixed and cannot be defeated.

15 Microphone Level Controls

Separate front panel mounted controls for Mic 1 and Mic 2 level are provided for each zone.

These controls provide the user with a convenient means to operate either microphone at a

suitable level in any zone; rotating any mic level control to the fully anti-clockwise position

effectively turns the microphone off. The microphone signals are routed directly to the main

output stage of the respective zone and mic signals are totally unaffected by the operation of

the music controls. The Mic 1 & Mic 2 gain controls on the rear panel should be set at a level

where it is not possible to have excessive gain even when the front panel level controls are

fully clockwise. For the benefit of the operator, self adhesive labels are provided to identify

the microphone channels and these can be fixed on the mixer front panel in the space

provided to the left of the level controls.

PAGING MICROPHONE

ZONE ACCESS SWITCHING

LINK TO 0V TO OPEN RESPECTIVE ZONE