Aqua Formula Optologic DAC

Aqua Hi Fi

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The Formula Dac is the first in the aqua – acoustic quality’s production to show a proprietary D/A conversion system, that we name Optologic Dac. This conversion system follows the same multibit technology (already used in the previous world acclaimed dacs such as La Voce and La Scala) but with a discrete R2R resistors ladder instead of Burr Brown PCM1704 dacs.


Galvanic and magnetic isolations are implemented between the FPGA and the four branches of the R2R ladder converter. This creates complete isolation of all digital circuitry – including the clock – from the analogue section for a pure clean ground plane. It also plays the main role in the differential management of the R2R ladders, achieving perfect symmetry between the counter-phase halves.
The result is the highest tonal contrast and naturalness never heard before from digital sources.


The Formula Dac uses no digital filter or any other compensation, relying instead on maniacal attention to each sub circuit. The analog and digital power supplies are executed purely discrete by extensive use of BJT, Mosfet, Jfet and ultra-fast diodes. Passive parts were selected not just for the best sonic result but also for their top quality, longevity and reliability. With the exception of six superior quality electrolytics, all other caps are Tantalum, solid-polymer OS-CON and double-metalized MJP. The signal path itself is direct-coupled and free of all capacitors. The two output stages (one single-ended, one transformer-coupled balanced) use discrete BJT and JFet with metal-film resistors. All the electronics parts show an ultra low RF noise.



Sample Rates Supported

AQlink / I2S serial bus – USB PC Audio : 24 bit / 384 Khz
DSD/64 & DSD/128
S/PDIF – AES/EBU : 24 bit / 192 KHz
Supports DSD via DoP on all inputs

Asynchronous USB (High Speed)

USB Type B

Digital Receiver

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

AQlink (I2S bus)

LVCMOS level

Digital to analog conversion type

Proprietary Optologic DAC

Oversampling factor


Analog Conversion method

Pure R2R ladder – FPGA (Field Programmable Gate Arrays)
based digital decoding without digital filter

Digital inputs

– RJ45 AQlink (I2S serial bus) – 24 bit / 384 KHz – DSD/128
– BNC coax (S/PDIF) 75 Ohm – 24 bit / 192 KHz – DSD/64
– USB port – 24 bit / 384 KHz – DSD/64 & DSD/128
Modular input:
– AES/EBU balanced 110 Ohm – 24 bit / 192 KHz – DSD/64
– RCA coax (S/PDIF) 75 Ohm – 24 bit / 192 KHz – DSD/64
– AT&T (ST Fiber) – 24 bit / 192 KHz – DSD/64
– Optical TOSLINK – 24 bit / 96 KHz

Analogue Outputs

UNBAL 2 RCA Output 2.4 V RMS
BALANCED ( passive transformers symmetrical ) 2 XLR Output :

Output Impedance

3.8V RMS

Load Impedance

10 Ohm RCA – 600 Ohm XLR
10 kOhm (min.) RCA – 600 Ohm XLR

Frequency Response

20Hz to 22kHz +0.5dB/-0.5dB


<0,016% 1KHz -10dB

Main processor

STM-ARM microcontroller

Control connectors

RS-232 D-SUB 9-pin connector

Front Panel

Power, phase invert, mute, input switch, RC5 remote sensor

Power Consumption

100-115V / 220-240V; 50 or 60Hz – 82VA


( W x D x H ) 450 x 380 x 100 mm


9 kg

Front finish

Satin Alu Silver or Satin Black

Case finish

Grey Nextel powder coated