Revision B.1 • 7/04
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1 G e n e r a l I n f o r m a t i o n
nal fuses and electronic safeguards against exces-
sive current.
The power supply has five regulated output volt-
ages. Two outputs (±16 volts) power the analog
audio circuitry. A third (+5 volts) powers the DSP
and logic control circuitry. The remaining outputs
power the clock/timer assembly (+12 volts) and
supplies phantom powering (+45 volts) for con-
denser microphones connected to the Microphone
Preamplifier module.
SPECIFICATIONS
AirWave Digital’s specifications are significantly
more complete, and the related test conditions
more defined, than those usually shown for con-
soles in this class. Be sure to follow the test condi-
tions and measure in the units as stated.
The specifications are for a fully-loaded AirWave
Digital-20 mainframe.
Test Conditions:
Specifications are for the basic signal paths, per
channel, with 600 ohm loads connected to the
analog program outputs.
0 dBu corresponds to an amplitude of 0.775
volts RMS regardless of the circuit impedance. This
is equivalent to 0 dBm measured into a 600 ohm
circuit for convenient level measurement with
meters calibrated for 600 ohm circuits.
Noise specifications are based upon a 22 kHz
measurement bandwidth. The use of a meter with
30 kHz bandwidth will result in a noise measure-
ment increase of approximately 1.7 dB.
Total Harmonic Distortion (THD) is measured
at a +23.5 dBu output level using a swept signal
with a 22 kHz low pass filter.
FSD = Full Scale Digital, +24 dBu
Microphone Preamplifiers
Source Impedance:
150 ohms
Input Impedance:
5 k ohms minimum, balanced
Input Level Range:
Adjustable, -70 to -30 dBu
Input Headroom:
>20 dB above nominal input
Output Source Impedance:
220 ohms balanced
Nominal Output Level:
+4 dBu, balanced
Output Load Impedance:
2.5 k ohms minimum
Analog Line Inputs
Source Impedance:
600 ohms or less
Input Impedance:
>40 k ohms, balanced
Input Level Range:
Adjustable, -10 to +4 dBu
Input Headroom:
20 dB above nominal input
Analog Main Outputs
Output Source Impedance:
80 ohms balanced
Output Load Impedance:
600 ohms minimum
Nominal Output Levels:
Program/Monaural Outputs: adj. +4 dBu
Telephone Mix-Minus: set at +4 dBu
Telephone Recorder Mix Feed: +4 dBu
Maximum Output Levels:
Program and Monaural: +24 dBu
Telco Mix-Minus: +24 dBu
Telco Recorder Mix Feed: +24 dBu
Digital Inputs & Outputs
Reference Level:
+4 dBu (-20 dB FSD)
Digital I/O:
Thru digital Input or RLS modules
and the digital program outputs.
Signal Format:
AES-3, S/PDIF (input only)
AES-3 Input Compliance:
24-bit
AES-3 Output Compliance:
24-bit
Digital Reference Frequency:
Internal crystal
Internal Sample Rate:
48 kHz
Processing Resolution:
24-bit fixed with
extended precision accumulators
Conversions:
A/D is 24-bit Delta-Sigma, 128x
with sample rate conversion on all digital
inputs. D/A is 24-bit Delta-Sigma, 128x
Latency:
<1 ms, Mic in to Monitor out; <300 µs
digital input to digital output
