Aphex 1788A Premium Eight Chan Mic Pre - Manual (Page 4)

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MICROPHONE PREAMPLIFIER
Page 5
Instruction Manual
1. INTRODUCTION
1. INTRODUCTION
The Aphex Model 1788A is a premium 8-channel remote controlled microphone
preamplifier with sophisticated features. Remote control means the preamps can be
located anywhere they are needed for optimum performance. By locating 1788A’s just
off-stage, near the microphones for example, many difficulties can easily be overcome
such as long mic lines picking up noise and RF interference; capacitance of long mic
lines degrading the high end response; mic splitters dumping multiple loads onto the mic
knocking down output level and making mics sound dull and lifeless.
1.1 LOGICAL CONTROL BLOCKS
Controls on the front are graphically divided into five separate blocks: Local, Control,
Digital, Monitor and Test.
The Local Block includes the individual meters and function lights for all eight channels,
and a single set of assignable function control buttons plus a multipurpose ADJUST knob.
The Control Block manages port and NET parameters. The Digital Block manages the
digital audio parameters when the Digital Option is installed. The Monitor Block puts the
selected channel’s sound up on headphones. The Test Block is used to calibrate system
levels.
1.2 PATENTED TECHNOLOGY
MicLim™, our patented “microphone output limiter”, limits in front of the preamplifier
to prevent overloading the front end. Now you don’t have to worry about clipping and
you can run higher gain and higher average output level. This translates not only to
distortion prevention, but to digital audio with maximum resolution and no “overs”.
Low
level signals that used to be lost in the noise will be audible, making your tracks more detailed and
dimensional.
LeNA™, our patented digitally controlled low noise amplifier, allows glitchless and
noiseless local and remote control over gain.
Our patented Drift Stabilized A/D Converter further advances the quality of digital
audio by perfectly balancing the ADC and eliminating its digital highpass filter.
1.3 SIGNAL & CONTROL
Analog I/O
The Model 1788A has three analog signal groups:
1. Eight Balanced MIC Inputs on XLR
2. Eight Servo-Balanced MAIN Line Outputs on XLR
3. Eight Active Balanced AUX Line Outputs on one 25 Pin D-Sub following Tascam
pinout.
Remote Control
1788A’s are controlled through MIDI protocol. Both standard MIDI and special Ethernet
LAN ports are provided. Anything producing MIDI such as a light controller board, a show
control system, a sequencer, a DAW, a MIDI controller, or a keyboard can act as the 1788A’s
controller. The Ethernet connection facilitates high speed remote control networking of a
constellation of 1788A’s. Up to 300 units (2400 mics) can be controlled by software and
64 banks of 16 units can be controlled by the hardware remote simultaneously.