Aphex 1788A Premium Eight Chan Mic Pre - Manual (Page 5)

Page 4
MICROPHONE PREAMPLIFIER
Page 5
Instruction Manual
1. INTRODUCTION
Optional Digital I/O
When the optional digital audio output module is installed, three 8-channel simultaneous
digital outputs are available:
1. Alesis ADAT® Output, Optical Fiber Interface
2. Tascam® TDIF™ Output, 25 Pin D-SUB
3. Aphex specific AES/EBU Output, 15 Pin D-Sub
Digital sync is derived from a selectable internal clock, or externally from either the BNC
clock I/O or the TDIF connector. A Dip Switch is provided to set certain critical parameters
relating to sync. Please refer to section 3 for the dip switch chart.
How LeNA™ Changes Everything
Other manufacturers’ remotely controlled preamps provide whopping and popping gain
steps of 4 to 10dB. Events often call for trimming the mic gain, and jumping through
such large steps can be painfully obvious to the audience and the talent. We worked
on this problem until we invented and patented a new technology that we call LeNA™
(Digitally Controlled Low Noise Amplifier). With LeNA we give you gain “stops” (stable
gain set-points) in 1dB increments that are ramped through inaudibly minute 1/4dB steps
- smooth as a baby’s bottom!
Presets - Another Advantage
The ability to create and save presets is a side benefit of having a comprehensive digital
remote control system. The whole eight channel array of preamp functions can be stored
to presets and recalled. You can reconfigure a single 1788A or a very large array of them
just by recalling a preset. This works out great when you need to re-set mics by the scene
or act, or to get fast setups at new venues.
Gain
Input Gain Control
MIC
INPUT
Tone Bus +48V
Phantom Power
Test Tone Pad
+20dB
Front End
HPF
Lo Cut
Servo
Bal.
MAIN
OUTPUT
(XLR)
AUX
OUTPUT
(DB25)
-26dB
Bal.
AES3
OUTPUT
(DB15)
Limiter
Limiter
Other Channel
Underlined Italics
indicate digital controls
Clip Light
Limit Light
Peak Meter
A/D
Conv.
Polarity
0-39dB
Clip Det. Level Det.
+6dB
Attn.
0 -27dB
Attn.
0-27dB
Pre
Post
Main Output Ref .
Aux Output Ref .
+6dB
ADAT
OPTICAL
WORD CLOCK
Input (BNC)
PLL
Internal
Clock
AES3 Outputs Paired
As 1&2, 3&4, 5&6, 7&8
Main Mute
Aux Mute
Clock Int/Ext.
Sample Rate
WORD CLOCK
Output (BNC)
TDIF
X4
1.4 SIMPLIFIED BLOCK DIAGRAM