Aqua La Scala MkII Optologic DAC

Aqua Hi Fi

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A never ending story: upgrading to the Optologic dac Again , La Scala DAC converter proves that an instant classic does not mean a product whose destiny is to become obsolescent, like most of the products in the high-end world. Now, after the first appearance in the flagship FORMULA dac, the proprietary D/A conversion system developed by AQUA is now available for La Scala MkII dac. So, our aficionados, who bought La Scala MkII dac before, have now the opportunity to upgrade their unit in order to reach to the revolutionary Optologic D/A conversion system. The already extraordinary sound quality of this icon is now improved in every aspect: time coherence, microdynamics, timbre, and without losing that magic atmosphere for which La Scala is widely renowned. La Scala MkII keeps the VALVE / MOSFET hybrid circuitry, with now a pair of selected Telefunken ECC81 tubes - a High-Frequency triode - for its low noise main feature.



High performance proprietary FPGA-based digital decoding without digital filter

Galvanic and magnetic isolations between the FPGA and R2R ladder converter

Discrete R2R ladder DACs with low noise precision resistors

Jitter free digital interface AQlink (I2S protocol), uncompromising digital connection to La Diva cd transport

Zero S/PDIF Jitter design, digital receiver stage PLL (phase locked loop) technology

High-performance AQ Discrete Regulator (MOSFET, J-FET, BJT) for analog and digital DAC’s power supply

Valve-Mosfet direct coupling analog stage in pure class-A without negative feedback

MOSFET Virtual battery circuit for analog anode supply

Soft-start power up for extended tube life

etherCON RJ45 (AQlink) input connection, employs CAT6 cable can connect both RJ45 and professional etherCON RJ45

2 separate low noise power transformers, one for the analog and one for the digital section

MODULAR DESIGN with upgradeable multi board system

Regulated DC filament supplies with soft start for tubes

Fully discrete analog stage, not even a single Op-Amp is used

Proprietary USB Firmware / driver :
Apple MAC OS – Linux OS : USB asynchronous native support, no need to install drivers software



Fully upgradeable asynchronous USB module with resolution up to 24 bit and 192 KHz, operates with computers running OSX 10.7 and above, WINDOWS 10 , 8 , 7 and XP ASIO – WASAPI bit perfect high-speed

Digital phase selector on front panel

High-quality parts selected for sound quality:
105° long life capacitors
low noise Metal Foil ultra-precision resistors
double metallized film pulse capacitor
ultra-fast diodes
halogen free cables

Aluminium anti-resonant cabinet with Nextel

Designed and handmade in Italy

etherCON RJ45 AQlink (I2S serial bus) – 24 bit / 384 KHz
AES/EBU balanced 110 ohm – 24 bit / 192 KHz
BNC coax (S/PDIF) 75 ohm – 24 bit / 192 KHz
RCA coax (S/PDIF) 75 ohm – 24 bit / 192 KH
USB port – USB port – 24 bit / 384 KHz – DSD/64 & DSD/128
AT&T (ST Fiber) – 24 bit / 192 KHz (optional)

Analog output:
RCA single-ended
XLR balanced with transformer



Native Sample Rates Supported

S/PDIF – AES/EBU : 24 bit / 192 KHz
AQlink – I2S serial bus : 24 bit / 384 Khz

Asynchronous USB (High Speed)

USB Type B

Digital Receiver

PLL (phase locked loop) technology 128 or 256 FS internally selectable

AQlink (I2S bus)

CMOS level

Digital filter

Proprietary DFD (Direct From Decoder) digital decoding without digital filter

Oversampling factor


Digital to analog conversion type

Multibit sign magnitude R2R ladder (upgradable)

Analogue Outputs

UNBAL 2 RCA Output 2.4 V RMS
BALANCED (symmetrical output) 2 XLR Output : 4.8V RMS

Output Impedance

100 Ω RCA – 200 Ω XLR

Load Impedance

10 k Ω (min.)

Frequency Response

20Hz to 20kHz +0.5dB/-0.5dB

Phase Response

Linear phase


<0.1% 1KHz -20dB

Front Panel

Power, input selector, Phase Invert switch

Power Consumption

100-115V / 220-240V; 50 or 60Hz – 58VA


( W x D x H ) 450 x 370 x 100 mm


9 kg

Front finish

Satin Alu Silver or Satin Black

Case finish

Grey Nextel powder coated