Specifications

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Front Panel

 

Instrument inputs 1&2:

Two  6.3mm mono jack sockets

Headphone outputs 1&2:

Two 6.3mm stereo jack sockets, with illuminated volume controls

Master volume control:

Assignable to any selection of outputs, with LED halo indication

Level meters:

Multi-segment, multi-color bargraphs with overload indication; eight for analog, two for digital, assignable to inputs or outputs

Input selector indicators:

Indicate modes of analog inputs as mic/line/instrument; plus phantom power indicator for mic mode

Overkiller-active indicators:

For each analog input, lit when Overkiller limiters are acting

Digital input indicators:

Input unlocked, and SRC (sample-rate converter) selected

Digital output indicator:

SRC (sample-rate converter) selected

Sample rate indicators:

Indicate session sample rate

Sync indicator:

Master, lit when interface is in local sync

Host indicator:

Indicates whether the host connection is via USB, Ethernet or MDIO module

Standby button:

With standby indicator (also flashes when unit is in 'identify' mode)

 

Rear Panel

 

Mic/Line inputs 1-8:

Eight Combo sockets; XLR for mic input, TRS jack (balanced or unbalanced) for line input

Line outputs 1-8:

Eight 6.3mm TRS jack sockets (balanced or unbalanced)

Digital inputs:

RCA socket for S/PDIF in, TOSLINK for S/PDIF or ADAT/SMUX in; (RCA can operate as AES3 input using XLR-RCA adapter supplied)

Digital outputs:

RCA socket for S/PDIF out, TOSLINK for S/PDIF or ADAT/SMUX out; (RCA can operate as AES3 output using RCA-XLR adapter supplied)

Wordclock I/O:

Two BNC sockets, output and input (75R)

USB port:

Ethernet port:

USB 2.0 B type device socket

RJ45 100BaseT socket, for factory and future use

MDIO expansion slot:

Accommodates optional MDIO (multi-channel digital IO) module for alternative host connection

MIDI I/O:

5-pin DIN sockets for MIDI out and in

Mains power:

3-pin 6A IEC inlet

 

Software Support

 

Mac OS support:

OS X 10.5 or later, Intel platform

Windows OS support:

Windows Vista, 7, 8 or later (32 or 64 bit)

Mac audio driver:

Core Audio device

Windows audio driver:

ASIO or WDM device

Control Panel app:

Graphical user interface for control of Atlas unit under Mac OS X or Windows

 

Analog Line Inputs

 

Configuration:

Electronically balanced, with fully-balanced analog signal path

Input sensitivity:

Switchable ‘+4dBu’ (0dBFS=+18dBu) or ‘-10dBV’ (0dBFS=+6dBu)

Input impedance:

14.5kR

Unbalanced mode:

Automatic

Total harmonic distortion:

-117dB (0.00014%, -0.1dBFS)

THD+n:

-111dB (0.00028%, -0.1dBFS)

Dynamic range:

116dB (-60dBFS)

Gain accuracy:

±0.05dB

LF roll-off:

-0.05dB at 8Hz; -3dB at <1Hz

HF roll-off:

fs=44.1kHz: -0.05dB at 21.1kHz; -3dB at 22.0kHz

fs=48kHz: -0.05dB at 23.0kHz; -3dB at 23.9kHz

fs=96kHz: -0.05dB at 32.0kHz, -3dB at 47.9kHz

fs=192kHz: -0.05dB at 32.0kHz, -3dB at 78.0kHz

CMRR:

20Hz..20kHz: >70dB

Inter-channel cross-talk:

1kHz: <-140dB; 20Hz..20kHz: <-120dB

Inter-channel phase:

10Hz..5kHz: ±0.25º, 5kHz..20kHz: ±1.0º, 20kHz..50kHz: ±2.0º

Overkiller:

Progressive limiter, auto-aligning, selectable per channel

Impact filter:

High-pass filter, -3dB at 80Hz, 40dB/decade (selectable for channels 1-2; whether in line, mic or instrument mode)

RIAA de-emphasis filter:

Response accuracy: ±0.22dB at fs=44.1kHz; ±0.14dB at fs=48kHz;±0.015dB at all other sample rates

MS matrix:

Allows direct connection of mid-side mics, or non-matrix mic-preamps (selectable for all analog input channels, whether in line or mic mode)

 

Microphone Preamplifiers

 

Configuration:

Electronically balanced, with fully-balanced analog signal path

Gain:

10dB to 65dB in 1dB steps (0dBFS = -56dBu to -1dBu)

Gain accuracy:

±0.05dB

Input impedance:

5.5kR

THD

+10dB gain: -116dB at -0.1dBFS (0.00016%)

+40dB gain: -110dB at -0.1dBFS (0.00032%)

THD+n:

+10dB gain: -108dB at -0.1dBFS (0.00040%)

Equivalent input noise (EIN):

+30dB gain: -128.5dBu (0R source); -126.3dBu (150R source)

+40dB gain: -130.9dBu (0R source); -127.6dBu (150R source)

+50dB gain: -131.2dBu (0R source); -127.7dBu (150R source)

+60dB gain: -131.4dBu (0R source); -127.8dBu (150R source)

LF roll-off:

-0.05dB at 20Hz; -3dB at 5Hz

HF roll-off:

As per Analog Line Input data (dependent on fs)

CMRR:

50Hz/60Hz: >110dB at all gains

1kHz: >100dB at all gains

20kHz: >90dB at all gains

Phantom power:

+48V, switchable per channel

Pad:

-20dB, switchable per channel

 

Instrument Preamplifiers

 

Configuration:

Unbalanced, high impedance buffer

Gain:

10dB to 65dB in 1dB steps, 18dB pad (0dBFS = -38dBu to 17dBu)

Gain accuracy:

±0.05dB

Input impedance:

1MR

 

Analog Line Outputs

 

Configuration:

Electronically balanced, with fully-balanced analog signal path

Output amplitude:

Switchable ‘+4dBu’ (0dBFS=+18dBu) or ‘-10dBV’ (0dBFS=+6dBu)

Output impedance:

100R balanced, 50R unbalanced

Unbalanced mode:

Automatic, with bootstrapping level compensation

Total harmonic distortion:

-107dB (0.00045%, -0.1dBFS)

THD+n:

-106dB (0.00050%, -0.1dBFS)

Dynamic range:

115dB (-60dBFS)

Gain accuracy:

±0.05dB

LF roll-off:

-0.05dB at 8Hz; -3dB at <1Hz

HF roll-off:

fs=44.1kHz: -0.05dB at 21.4kHz; -3dB at 22.0kHz    

fs=48kHz: -0.05dB at 23.2kHz; -3dB at 23.9kHz

fs=96kHz: -0.05dB at 32.0kHz, -3dB at 47.8kHz

fs=192kHz: -0.05dB at 32.0kHz, -3dB at 76.0kHz

Output balance:

>50dB

Inter-channel cross-talk:

1kHz: <-135dB; 20Hz..20kHz: <-120dB.

Inter-channel phase:

10Hz..5kHz: ±0.4º, 5kHz..20kHz: ±0.25º, 20kHz..50kHz: ±0.5º.

 

Digital Input

 

Formats supported:

S/PDIF (RCA or TOSLINK), ADAT, ADAT SMUX (TOSLINK)

Sample rates supported:

S/PDIF (2 channel): 44k1, 48k, 88k2, 96k, 176k4, 192k

ADAT (8 channel): 44k1, 48k; ADAT SMUX (4 channel): 88k2, 96k

Channel Status:

Ignored

Word-length:

24 bits

AES3 operation:

Via S/PDIF RCA, using XLR-RCA adapter (supplied)

Sample-rate converter (SRC):

Selectable at S/PDIF input, allowing input at any sample rate

Bit-transparency:

Maintained (allows recording of Dolby or DTS streams)

 

Digital Output

 

Formats supported:

S/PDIF (RCA or TOSLINK), ADAT, ADAT S/MUX (TOSLINK)

Sample rates supported:

S/PDIF (2 channel): 44k1, 48k, 88k2, 96k, 176k4, 192k

ADAT (8 channel): 44k1, 48k; ADAT S/MUX (4 channel): 88k2, 96k

Channel Status:

Full implementation, Consumer (S/PDIF) or Professional (AES3)

Word-length:

24 bits, or reduction to 16 bits using flat TPDF dither or Prism Sound SNS (Super Noise-Shaping - four alternative shapes available)

AES3 operation:

Via S/PDIF RCA, using RCA-XLR adapter (supplied)

Sample-rate converter (SRC):

Selectable at S/PDIF output; output rate can be referenced to Wordclock, DI or local clock at 44k1, 48k, 88k2, 96k, 176k4 or 192k

Bit-transparency:

Maintained in 24 bit mode (allows playback of Dolby or DTS streams to external decoder)

 

Sample-rate converter (SRC)

 

THD+n:

<-137dB (0.000014%, -0.1dBFS)

Dynamic range:

>138dB (0.000013%, -60dBFS)

 

Synchronization

 

System sample rates:

44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz or 192kHz

Synchronization sources:

Master: Local

Slave: Wordclock, DI (S/PDIF input) or ADAT

Local clock accuracy:

+/-50ppm

Jitter rejection:

60dB/decade above 100Hz

Internal mixer delay:

(total analog in to out)

44.1k: 0.57ms; 48k: 0.52ms; 88k2: 0.20ms; 96k: 0.18ms; 176.4k: 0.09ms; 192k: 0.08ms

 

Physical

 

Dimensions:

Table-top (including feet): 447x290x95mm

1U rack-mount (including optional ears): 483x290x89mm

Weight:

5.0kg.

Mains voltage:

90VAC-250VAC, 50-60Hz

Power consumption:

15W

Fuse rating:

0.5A(T), 20mm, glass

Operating ambient:

0 to 35ºC, 85% maximum relative humidity

 

Performance Plots

 

 

 

 

 

Except where otherwise stated, audio performance data are typical, RMS, unweighted, 20Hz..20kHz figures, measured at 997Hz, using fs=96kHz and '+4dBu' sensitivity settings.

 

In keeping with our policy of continual development, specifications are subject to amendment without notice.

 

E&OE.  All Trade Marks acknowledged.