Prism Sound Lyra-2 2 x 4 Small Format Audio Interface

Lyra represents the pinnacle of compact audio interfaces. Packing Prism Sounds trusted, uncompromising AD/DA conversion into a compact chassis perfect for use in the studio or on the road.

Based on the Orpheus’ audio path and clock circuitry, Lyra is ideal for those who don’t require a large I/O count, but do demand the highest quality and most transparent AD/DA available.

RENOWNED AD/DA CONVERSION
Lyra cuts no corners in its design and boasts the same trusted Prism Sound convertors used on countless hit records. It’s ultra-transparent characteristic means what you put into the Lyra is exactly what you get out of it.

PRISTINE PRE-AMPLIFICATION
Featuring two class-A microphone preamps, Lyra 2 guarantees superbly clean, detailed recordings that capture a performance the way it was intended.

SOFT-CLIP LIMITING (OVERKILLER)
Lyra's analogue input channels include a switchable Prism Sound 'Overkiller' circuit. This soft-clip limiter gently absorbs transients and allows signal levels to be pushed to their limits without risk.

QUALITY SUPPORT
Prism Sound's reputation for audio excellence has been matched only by its top quality after-sales support and technical advice. The longevity of a Prism Sound product is a testament to the dedicated team behind it.

Technical Specifications

FRONT PANEL
Instrument Inputs
2 x 6.3mm mono jack sockets, auto-select to analogue inputs 1 & 2 when plugged, software override
Headphone Output
1 x 6.3mm stereo TRS Jack with illuminated volume control
Master volume
Assignable encoder / push switch with halo indication
Standby button
with standby indicator (also flashes when unit is in ‘identify’ mode)
Level Meters
4 x multi-segment, multi-colour bargraphs with overload indication, 2 for analogue, 2 for digital, assignable to inputs or outputs, analogue outputs switchable 1/2 or 3/4.
Input selection
Indicate mode of analogue inputs as Mic / line / inst & plus phantom power indicator for mic mode
Overkiller
For analogue inputs, lit when Overkiller limiters are acting
Digital Input
indicators for digital input unlocked and SRC (sample-rate converter) selected
Digital Output
indicator for SRC (sample-rate converter) selected
Sync
Master indicator, lit when interface is in local sync

REAR PANEL
Mic inputs
2 x XLR sockets
Line inputs
2 x 6.3mm TRS jack sockets (balanced or unbalanced)
Line outputs 1-4
4 x 6.3mm TRS jack sockets (balanced or unbalanced)
Digital inputs
1 x RCA 1 x TOSLINK for S/PDIF or ADAT Optical input; (RCA can operate as AES3 input using XLR-RCA adapter supplied)
Digital output
1 x RCA 1 x TOSLINK for S/PDIF or ADAT Optical output; (RCA can operate as AES3 output using XLR-RCA adapter supplied)
Wordclock
2 x BNC sockets, output and input (75 OHM)
USB port
1 x USB type B receptacle
Mains power
3-pin 6A IEC inlet

SOFTWARE SUPPORT
Mac OS Support
OS X 10.5 or later on Intel and Apple M1 silicon
Windows OS Support
Windows Vista, 7, 8 or later (32 or 64 bit)
Mac audio driver
Core Audio device
Windows audio driver
ASIO and WDM
Linux audio driver
Lyra is a UAC2 class compliant device – no driver needed on recent distros
Control Panel applet
Graphical user interface for control of Lyra unit under Mac OS X or Windows

ANALOG LINE INPUTS
Configuration
Electronically balanced, with fully-balanced analogue signal path
Input Sensitivity
Switchable ‘+4dBu’ (0dBFS = +18dBu) or ‘-10dBV’ (0dBFS = +6dBu)
Input Impedance
14.5k OHM
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 78kHz
CMRR
20Hz..20kHz: >70dB
Inter-channel cross-talk
1kHz: <140dB; 20Hz..20kHz: <-120dB
Inter-channel phase
10Hz..5kHz: +/-0.25°,
5kHz..20kHz: +/-1.0°,
20kHz..50kHz: +/-2.0°,
Overkiller
Progessive 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
(Lyra 2 only)
Response accuracy:
+/-0.22dB at fs=44.1kHz;
+/-0.14dB at fs=48kHz;
+/-0.015dB at other sample rates
M-S matrix (Lyra 2 only)
Allows direct connection of mid-side mics, or non-matrix mic-preamps

MICROPHONE PREAMPLIFIERS
Configuration
Electronically balanced, with fully balanced analogue signal path
Gain
10dB to 65dB in 1dB steps (0dBFS = -56dBu to -1dBu) plus switchable -20dB pad
Gain accuracy
+/-0.05dB
Input impedance
5.5k OHM
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 (0 OHM source); -126.3dBu (150 OHM source)
+40dB gain: -130.9dBu (0 OHM source); -127.6dBu (150 OHM source)
+50dB gain: -131.2dBu (0 OHM source); -127.7dBu (150 OHM source)
+60dB gain: -131.4dBu (0 OHM source); -127.8dBu (150 OHM source)
LF roll-off
-0.05dB at 20Hz, -3dB at 5Hz
HF roll-off
As per analogue 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
1M OHM

ANALOG OUTPUTS
Configuration
Electronically balanced, with fully-balanced analogue signal path
Output amplitude
Switchable ‘+4dBu’ (0dBFS = +18dBu) or ‘-10dBV (0dBFS = +6dBu)
Output impedance
100 OHM balanced, 50 OHM unbalanced
Unbalanced mode
Automatic, with bootstrapping level compensation
Total harmonic distortion
-107dB (0.00045%, -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 76kHz
Output balance
>50dB
Inter-channel cross-talk
1kHz: <-135dB; 20Hz..20kHz: <-120dB
Inter-channel phase
10Hz..5kHz: +/-0.4°,
5kHz..20kHz: +/-0.25°,
20kHz..50kHz: +/-0.5°,

DIGITAL INPUTS
Formats supported: Lyra 2
S/PDIF (RCA or TOSLINK), ADAT, ADAT S/MUX (TOSLINK), AES3 (XLR via supplied adapter cable)
Sample rates supported
44.1, 48, 88.2, 96, 176.4 and 192kHz
Sample rates supported: ADAT
(Lyra 2 only)
ADAT (8 channel): 44k1, 48k
ADAT SMUX (4 channel): 88k2, 96k
Channel Status
Ignored
Word-length
24 bit
AES3 Operation (Lyra 2)
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 OUTPUTS
Formats supported
S/PDIF (RCA or TOSLINK), ADAT, ADAT S/MUX (TOSLINK), AES3 (RCA)
Sample rates: S/PDIF/AES3
44.1, 48, 88.2, 96, 176.4 and 192kHz
Sample rates: ADAT
(Lyra 2 only)
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 bit, or reduction to 16 bits using flat TPDF dither or Prism Sound SNS (Super Noise Shaping – four alternative shapes available)
AES3 (AES/EBU) operation
(Lyra 2 only)
via S/PDIF RCA, using RCA-XLR adaptor (supplied) and AES3 mode (2V p-p, 110 OHM and AES3 channel status)
Sample-rate converter (SRC)
(Lyra 2 only)
Selectable at S/PDIF output; output rate can be referenced to Wordclock, DI or local clock at 44.1, 48, 88.2, 96, 176.4 or 192kHz
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
44.1 / 48 / 88.2 / 96 / 176.4 / 192kHz
Master
local, Wordclock (Lyra 2 only), DI (S/PDIF input) or ADAT (Lyra 2 only)
Local clock accuracy
+/-50ppm
Jitter rejection
>60dB / decade above 100Hz
Internal mixer delay
(total analogue in to out)
fs = 44.1kHz: 0.57ms;
fs = 48kHz: 0.52ms;
fs = 88.2kHz: 0.2ms;
fs = 96kHz: 0.18ms;
fs = 176.4kHz: 0.09ms;
fs = 192kHz: 0.08ms;

PHYSICAL
Form factor
2/3 width, 1U 19inch rack mountable
(Rack ears available as an option)
Dimensions
Table top (inc. feet):
W: 285mm D: 242mm H: 50mm

Rack-mount (inc. optional ears):
W: 483mm D: 242mm H: 44.5mm
Power
90-250VAC, 50-60Hz
internal power supply
IEC 6A connector
Power consumption
15W
Fuse rating
0.5A(T), 20mm, glass
Weight
2.1kg
Operation ambient conditions
0 to 35°C, 85% maximum relative humidity
Supplied accessories
CD with software and manuals x 1
IEC mains lead x 1
USB Lead type A to B x 1
XLR-F to RCA-M adaptor (S/PDIF/AES3) (Lyra 2 only) x 1
XLR-M to RCA-M adaptor (S/PDIF/AES3) (Lyra 2 only) x 1