The Alice 504T Lunchbox Mic Premicrophone input uses unique circuitry designed to get full warmth from any professional microphone while at the same time having that ‘fairy-dust’ sound. Both microphone and line inputs maintain wide overload margins and extreme low noise performance. The audio gain in the system is shared across four lownoise amplifier stages to handle the most difficult of sounds. The limiter/compressor is a classic Ted Fletcher design from 1979 when it was first introduced in the Alice 828 portable mixer and known to have gained admiration and used by top artists and major studios just for the sound of the limiter! Special Technical Features
 
TRANSIENT DISTORTION — In conventional microphone amplifiers most of the amplification is in a single amplifier stage which may measure as ‘low distortion’ with test tones, but very often, small transient spikes disturb the stability of the amplifier and produce momentary peaks that are not amplified correctly. This can and does degrade the sound but the 503 with ‘shared gain’, handles transient peaks perfectly.
 
HARMONIC DISTORTION — The Alice 503 microphone amplifier is in 4 sections; this arrangement minimises unpleasant 3rd order harmonic distortion even at low frequencies producing warm full sounds getting the very best from your microphone. When the limiter is in use there is an increase in 2nd order harmonic content, this is a natural effect of this limiter and produces a ‘warming’ effect to the sound.
 
NOISE — Absolute ‘State-of-the-Art’ noise performance and high gain makes the 503 ideal for matching with ribbon microphones.
 
Technical Specification
Mic input: 20Hz to 20KHz – precision balanced +0, -1dB
Line input: 10KHz
Relative input noise: -128.6dB
Harmonic distortion: (@ 0dB output 1KHz) 2nd order 0.005%, 3rd order 0.03dB
Maximum mic gain: 77dB
Maximum input level: approx -10dBu
Maximum output level: +22dBu
High pass filter: 6dB/8ve 3dB down at 75Hz
Limiter: soft knee with approx 12:1 ratio
Switchable phantom power: In/out
Switchable mic/line: In/Out
Switchable limiter: In/Out