AUQA HIFI

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Our pure R2R Ladder Optologic DAC, fully-floating (isolated) FPGA-based DAC
The Formula DAC is the first in aqua’s history to implement a proprietary resistor ladder conversion system, the Optologic DAC.
The signals sent to the resistor ladders are generated by a proprietary digital circuit, programmed inside a FPGA (Field Programmable Gate Array).
The Optologic D/A conversion system has a sign-magnitude converter structure which requires not two but four 24-bit resistor banks; each one made with low tolerance discrete resistors.
In order to separate the sensitive analog circuits from the digital section, galvanic and magnetic isolation is implemented between the FPGA, and four branches of the R2R ladder converter.
This achieves complete isolation of the entire digital circuit - including clock - from the analogue section resulting in a clean, noiseless, ground plane. 
It also serves a critical role in the differential management of the R2R ladders, creating perfect symmetry between the counter-phase halves. The result is the highest tonal contrast and naturalness. 

Innovation through Technologies
The absence of digital filtering means no processing of the input signal. The original digital samples are translated to the reproduced sound, preserving the transient shape and avoiding any ringing.  
In this way we also avoid the "intersample overs" problem that is vital to faithful reproduction, considering current recording studio practices. 
With our R2R conversion technology the sound is natural, fast, dynamic, and without the sense of compression characterizing others converters. We could say that our effort at aqua is to obtain a sonic result comparable to that produced by a studio master reel-to-reel recorder.
For aqua being able to reproduce the precise temporal response, dynamics and harmony of sound far outweighs technical measurements. After all, achieving "analog sound" is what matters most. 
We are continuously experimenting and open to new discoveries which is why our machines are modular and upgradable to accommodate future technology.


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LA VOCE

Designed to provide absolute modularity, the La Voce S3 is a pure R2R ladder - FPGA-based DAC without digital filter. It has a sign-magnitude ladder converter. 
The absence of digital filtering means no processing of the input signal. The original digital samples are translated to the reproduced sound, preserving the transient shape and avoiding any ringing.  
In this way we also avoid the "intersample overs" problem that is vital to faithful reproduction, considering current recording studio practices. 
With our R2R conversion technology the sound is natural, fast, dynamic, and without the sense of compression characterizing others converters.

 
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LA SCALA

La Scala D/A 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.
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, current Owners, have 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.

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FORMULA

aqua believes that the more musical D/A conversion system is based on the circuit usually identified as "resistor ladder".
This technology has been substituted in the mass-market by the so-called sigma-delta converters.
The sigma-delta converter is a near-completely digital circuit and for this reason it can be can be integrated on silicon and produced at low-cost. 
A quality resistor ladder DAC instead uses a circuit based on a set of high precision discrete resistors: at least 2 resistor banks, one for each stereo channel.
The Formula DAC is the first in the aqua’s production to show a proprietary D/A conversion system, that we name Optologic.
The signals sent to the resistor ladders are generated by a proprietary digital circuit, implemented inside an FPGA (Field Programmable Gate Array).


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