ASP 4 Microphone preamplifier
Introduction
The ASP 4 is a 4 channel microphone preamplifier, each channel having balanced input and
outputs on XLR connectors, features include phantom power (48V or 18V), LF Filter, Mute,
phase reverse, line level setting, 50dB gain range, volume control and level meter.
Factory setting
The roll off frequency of the LF Filter has 5 internal settings, factory setting is position 3 which is
70Hz. The other settings are 35Hz, 50Hz, 110Hz, and 150Hz.
The phantom power has 2 internal settings, factory setting is 48V. The second setting is 18V.
Gain is factory set to about 30dB and is adjustable via the back panel.
To change the settings ensure the power is disconnected, remove the 3 screws either side of
the top cover and the 2 screws on the top cover (retain for refitting).
Move the jumpers shown in appendix 1 to the required positions for the settings you require, the
silk screen legend on the PCB indicates setting.
Refit the covers.
Front and rear panels
Set up
The 4 channels are marked channels 1
– 4 and each channel is independent with its own
controls, indicators and settings. All switches are illuminated when on, the back panel switches
also hav
e LED’s on the front panel to indicate when they are on.
When using with microphones, connect a microphone to an input, if phantom power is required
select phantom power by pressing the front panel switch on the appropriate channel.
If phase reverse is required select phase reverse by pressing the switch on the back panel, this
will reverse hot and cold connections on the input XLR. (phase reverse LED on the front panel
will also light).
Set the front panel volume control to 3/4 clockwise position then talk into the microphone and
adjust the gain control on the back panel (adjacent to the input XLR) until the LED level meter
reads 0dB.
PUSH
PUSH
PUSH
PUSH
Содержание ASP4
Страница 1: ...ASP4 4 CHANNEL MIC PREAMP USERS MANUAL...
