BSS Audio MSR-602/604II Owner's Manual - Manual (Page 16)

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MSR-600 II Series
3.5 MSR-604 II
Controls
PHANTOM ON/OFF
LINE/MIC
GAIN
CLIP LED
The MSR-602 II power supply provides each MSR-604 II with 48v DC
for phantom powering capacitor microphones. This is selected by
operating the individual channel switch and it is connected across the
‘input’ connector in the standard phantom powering manner. Typical
current availability is 10mA per channel for a 40 channel system.
Phantom power is indicated by a front panel LED.
It should be noted that phantom powering is interlocked to the LINE/MIC
switch so that when LINE input is selected phantom power and the LED
indicator are disabled.
This switch introduces a 20dB pad into the input circuit of the unit, and
raises the input impedance to suit line level signals. In the mic position
the maximum signal level is +13dBu (with the GAIN set to -10dB). In
the line position phantom powering is disabled and the maximum
permitted signal level is +33dBu (with the GAIN set to -10dB).
The GAIN switch allows the input amplifier gain to be changed in 10dB
steps from -10dB to +30dB to precisely match the input signal to the
internal headroom of the MSR-604 II. Combined with the very low
inherent noise of the input stage this ensures that none of the dynamic
range of the source is lost.
The absolute system gain is dependent upon the internal system
configurations chosen, but with factory default settings and in the MIC
position the gain indicated on the GAIN switch setting is correct, i.e.
with a mic input, 0dB gain selected and default jumper settings the
output level is the same as the input signal.
The CLIP LED which is situated below the GAIN switch illuminates
when the peak signal level approaches within 1dB of clip. It features
a fast acting full wave rectifier and a hold circuit which ensure that all
transient peaks are unambiguously indicated.
MSR-604 II Controls