Sound Performance Lab 2711 - Manual (Page 7)

RackPack: Preference Mic Pre 7
When recording acoustic instruments or vocals, using a microphone
is inevitable. The actual output level of a microphone is very low and
therefore has to be boosted to studio or line level (0 dB) with a pream-
plifier. Sometimes signals have to be boosted by a factor of 2000 or
more. As a consequence, the resulting sound quality provided by the
preamp is of paramount importance, so a good microphone preamp
that does not overdrive is the definitive requirement in order to record
acoustic instruments or vocals with sufficient dynamics and untainted
sound.
The section “Technology” from page 14 explains how the Preference
Mic Pre meets these requirements.
Main Features
The Preference Mic Pre offers preamplification values of up to +72 dB
with lowest noise operation and a high common mode rejection.
A VU meter with two modes for average levels (VU) and peak levels
(PPM) displays the output levels.
A very stable phantom power supply (48 V) is provided to power con-
denser microphones.
The polarity of the microphone can be switched with the phase reverse
switch.
A high-pass filter protects against low frequency interferences.
Two LEDs are placed into the VU window to concentrate all displays in
one area.
The signal LED (SIG.) indicates that an input signal is present, the
overdrive LED (OVL) warns against potential overdrives.
Introduction