Sound Devices 774T, User Manual And Technical Information

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65
Specifi cations
System
Sampling Frequency internal: 32, 44.1, 48, 48.048, 88.2, 96, 96.096, 176.4, 192 kHz
external clocking: 32–192 kHz via word clock input
Internal Data Path and
Processing 32 bit, 192 dB dynamic range
A/D, D/A Converters 24 bit, 192 kHz sampling rate maximum. A/D converters on socketed, field-upgradeable
daughter board
A/D Dynamic Range 114 dB, A-weighted bandwidth
110 dB, 20 Hz–22 kHz bandwidth
D/A Dynamic Range 112 dB, A-weighted bandwidth
108 dB, 20 Hz–22 kHz bandwidth
Metering 76-segment (4 x 19), sunlight-viewable
selectable peak, VU, or peak (with or without peak hold) with VU ballistics, variable brightness
Analog Input
(all measurements at Fs 96 kHz, 24 bit unless noted)
Frequency Response Mic or Line: 10 Hz–40 kHz, +0.1,
−
0.5 dB (gain controls centered)
Equivalent Input Noise Mic:
−
133 dBu max (
−
135 dBV), 50 ohm source, A-weighted filter
Mic:
−
131 dBu max (
−
133 dBV), 50 ohm source, 20 Hz–20 kHz BW flat filter, gain fully up
Mic:
−
130 dBu max (
−
132 dBV), 150 ohm source, A-weighted filter
Mic:
−
128 dBu max (
−
130 dBV), 150 ohm source, 20 Hz–20 kHz BW flat filter, gain fully up
THD + Noise Mic: 0.004% max (1 kHz, 22 Hz–22 kHz BW, gain control down,
−
15 dBu input)
Line: 0.004% max (1 kHz, 22 Hz–22 kHz BW, gain control down, +16 dBu input)
Gain
(input dBu to
−
20 dBFS)
Mic (normal gain mode): 25–70 dB
Mic (low gain mode): 10–55 dB
Line:
−
6–18 dB, 0.1 dB increments
Input Impedance Mic (XLR): 7.5k ohm
Line (XLR and TA3): 20k ohm
Input Clipping Level Mic input:
−
5 dBu minimum (normal gain mode, gain control fully down)
Mic input: +10 dBu minimum (low gain mode, gain control fully down)
Line input: +26 dBu minimum (gain control fully down)
Input Topology Mic and Line: fully electronically balanced, RF, ESD, short, and overload protected; pin-2 hot,
pin-3 cold
Gain Matching Line inputs: ±0.1 dB, channel-to-channel
Common Mode Rejection
Ratio Mic: 40 dB minimum at 80 Hz
High-Pass Filters 40, 80, 160, 240 Hz @ 12/18/24 dB/oct (all menu selectable)
Mic Powering
(each XLR selectable) 48 V phantom through 6.8k resistors, 10 mA per mic available, menu-selected per channel in mic
or line level positions
Mic Input Limiters analog (pre-A/D converter), dual-stage optocoupler and FET,
−
4 dBFS threshold, 20:1 limiting ratio, 5 mS attack time, 200 mS release time
Output Analog
Line Output Clipping
Level +20 dBu minimum, 10k ohm load
Attenuation & Resolution 0–40 dB, 1 dB increments
Output Topology Line: fully electronically-balanced, RF, ESD, short, and overload protected; pin-2 driven hot,
pin-3 driven cold; let pin-3 float for unbalanced connections.