P R I S M CS O U N D
WORLDS FINEST D/A CONVERTERS




THE TWIN SISTERS OF THE FAMED PRISM ORPHEUS ARE NOW AMONG US, TO BE KNOWN AS LYRA 1 & LYRA 2.


PRISM is now shipping the new Lyra 1 and Lyra 2 audio interfaces. Incorporating the design elements and converter technology of the 8 channel Orpheus into smaller 2 and 4 channel designs. As with the Orpheus, the Lyra series designs are leading edge all-in-one processors with on-board A/D, D/A and Preamplifier sections. The Lyra 1 and Lyra 2 carry on the reference standard sonics that studios around the world rely upon every day.



S P A T I A L is the authorized reseller for the audiophile market







Lyra 1 (2 channel) $2350

Lyra 2
(4 channel) $3225

Orpheus
(8 channel) $4495




No-compromise, full Prism Sound audio quality
Lyra makes no compromises on audio quality. It is the result of years of research and development into digital audio conversion and extensive dialogue with Prism Sound's customers.

The Lyra design brief was: Prism Sound quality at an even more accessible price point. Lyra has the same no-compromise analogue front and back ends as its brother Orpheus, with the same fully-balanced-throughout architecture and the same isolation barriers protecting the analogue from digital and computer interference.

Lyra draws on Prism Sound's years of experience in developing digital audio products, including its range of audio test equipment, adopted by a wide variety of clients across the audio industry from pro-audio to consumer electronics. This experience means that Lyra is well-behaved both as a computer peripheral and an audio processor.

Reliability is vitally important in professional recording. Prism Sound has always made extensive use of precise software calibration techniques in its converters - pots and tweaks are always unreliable, so there are none.

The design team has gone to great lengths to minimise noise and interference, in particular hum. All of the analogue circuits have galvanic isolation, while the unit's electronically balanced I/O allows it to handle common mode interference sources as well as enabling trouble-free connection to unbalanced equipment.

It is often said that THD+N figures do not always correlate well with the perception of sound quality and this is true - partly because the traditional measures of THD+N or SINAD expressed as RMS figures are rather a broad measure. With this in mind, we have taken great care to make sure that not only is the RMS THD+N figure very good, but the Lyra noise and distortion spectrum is beyond reproach and that Lyra provides the most transparent listening experience.





Lyra 1 Front Panel

 
Instrument inputs 1&2:
Two 6.3mm mono jack sockets
Headphone output:
6.3mm stereo jack socket, with illuminated volume control
Master volume control:
Assignable to any selection of outputs, with LED halo indication
Level meters:
Multi-segment, multi-color bar graphs with overload indication; two for analog, two for digital, assignable to inputs or outputs (analog output switchable 1/2 or 3/4)
Input selector indicators:
Indicate modes of analog inputs 1-2 as mic/line/instrument; plus phantom power indicator for mic mode


Digital input indicators:
Input unlocked, and SRC (sample-rate converter) selected
Digital output indicator:
SRC (sample-rate converter) selected
Sync indicator:
Master, lit when interface is in local sync
Standby button:
With standby indicator (also flashes when unit is in 'identify' mode)
 





Lyra 1 Rear Panel

 
Mic inputs 1-2:
Two XLR sockets for mic
Line inputs 1-2:
Two 6.3mm TRS jack sockets (balanced or unbalanced)
Line outputs 1-4:
Four 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

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 Lyra 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 channels 1-2; 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): 285x242x50mm
1U rack-mount (including optional ears): 483x242x44.5mm
Weight:
2.1kg.
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
 











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