User guide

MA60 & MA60media Installation and User Guide v1.2
23
1
4
3
2
Pri. Sec.
To 100/70/50 V-line
speaker system
70 V
50 V
COM
White
Black
Red
Brown
Black
CXL-50T
Blue
100 V
Connect to
CN15B
Rear panel
connector
11. After plugging the connector in, the safety cover should be tted by securing it
to the female ends of the hex pillars using the two M3 screws supplied.
Important - Note that the low-impedance output should not be used once the line
output transformer is tted.
Once the transformer is tted, it is strongly recommended that the MA60/
MA60media’s 65 Hz high pass lter is set ON by moving internal jumper J13. This is
to minimise distortion due to transformer saturation at low frequencies. See “PCB
layout diagrams” on page 30 for further information regarding the internal jumpers.
Output Equalisation
Independent bass and treble EQ controls are provided for the main outputs. These
are of the preset type and are located on the rear panel
4
. The treble control has a
range of ±10 dB at 10 kHz and the bass control has a range of ±10 dB at 50 Hz.
By default, this EQ adjustment affects only the music signal, but it may be enabled for
the microphone input by moving internal jumper J10, in which case the rear panel
controls will affect the both the music source and the microphone signal. See “PCB
layout diagrams” on page 30 for further information regarding the internal jumpers.
MOH/Utility output
The MOH/Utility output (MOH = Music On Hold) is an auxiliary output which
can be used as an extra output for various purposes. This is available both as a
transformer-isolated line level output and a non-isolated low-power amplier output
(approx. 1 W).
A common application for this output is to provide a continuous music-on-hold
feed to a telephone system. It should be noted that a xed LF lter reduces bass
frequencies in this output to optimise it for use with telephone systems. The low-
power output is suitable for connection to systems that require a speaker level feed.