|  The housing of the HAD D/A Converter is made of hand-polished granite slabs. The mass of the granite housing eliminates most of the external influences that can have a detrimental effect on the sound of digital components. The NERO ASSULUTO granite was chosen because of its structure. This material can contribute to even larger sound spectrum of the component. In the end it gives the converter a touch of infinity and a top-notch appearance.
The legs are made of full Inox steel, which give HAD a touch of grandeur that it deserves as a reference product of industrial design as well as a reference leading High End device. HAD owners are advised to use the long legs so that the component can serve its purpose as we intended, although we do offer a set of short legs as well. HAD's digital to analog converter electronics, excluding the power supply assembly, is set in an Inox housing and filled with a special epoxy compound that nullifies unwanted frequencies which are not a part of the algorithm.  HAD's algorithm is based on the last generation 24 bit/192kHz Sampling, Advanced Segment converter, produced by Texas Instruments. As a result of exhaustive researche in the field of digital technology and its deficiencies the STYLOS SYS development team decided to utilize this converter, in a unique circuit, in the audio logarithm . Although these converters are 24-bit converters, they have proven themselves, in the given algorithm, to produce the best sonic results when working with a 16 bit resolution and the system clock set to 384 Fs. The algorithm uses also a digital filter with 8x oversampling because the popular "zero oversampling" has proven itself entirely inappropriate as far as the sound is concerned. HAD does not use any processor or operational amplifier in its electronic circuit since both of them turned out to be inappropriate for audio purposes.
The I/V converter and the first order output stage were specifically developed for HAD's algorithm. The class A, single ended output stage features zero feedback,IRF MOS-FET transistors, the same used in the I/V convertor, for their neutral sound, compared to the electron tubes whose specific character is mostly impossible to get rid of. The output stage has no trouble with impedance matching, it can work unto a short circuit and that gives it the output impedance of 0 virtual Ohms. The output stage is balanced. Balanced outlets enable the maximum dynamics of the component. Balanced (XLR) signal is twice as strong as the signal of the SE (RCA) outlets. The HAD power supply is a Semi regulated MOS-FET power supply circuit designed for the analog filter stage, the I/V conversion and the analog output stage, as well as separated charging for digital and analog parts of the conversion algorithm. All the electronics' components are electronic industrial elements of high quality and high tolerance, ensuring long term use. There are two analog outputs one XLR balanced output and one RCA single ended output. Digital inputs are the 75-ohm RCA input and the BNC input. We recommend you to use the BNC input because of a lower "jitter". Digital inputs accept all the PCM coded signals according to the S/PDIF and AES3id standards. The AES/EBU digital input standard is not used because of the capacity problems of the pairs of long digital shielded cables. The BNC digital input is also recommended for long digital connectors because at the input of HAD's electronics every digital signal gets stronger. Only one of the digital inputs can be connected at a time.
Stylos Sys HAD DAC Specifications Digital input: Single BNC (75 Ohm) and RCA connector (S/PDIF, AES3id standard digital audio interface)
1.2V p-p 1.6mA max. input; 10m (S/PDIF), 1000m (AES3id) max. distance of coax. cable
Up to 48kHz accepted sampling frequeny, up to 16bit accepted wordlength Analog output: Disktere MOS-SET class A, no feedback, servoless, DC coupled, short circuit proof, symmetrical output stage
XLR balanced output ( 5V RMS at 0 dB )
RCA SE output ( 2,5V RMS at 0 dB )
Virtually 0 Ohm output impendance
Linearity +/- 0.5 dB ( 20Hz - 20kHz ) Power supply: Internal non switching power supply
110/120 (on request) or 220/230V AC (on request) 50/60Hz input voltage Semi regulated MOS-FET power supply circuit for analog stage
Full regulated power supply for DAC alghrithm
3 separate high quality UI transformers Measurements and other specification: Total harmonic distortion plus nois:
Smaller than 0.1% ( Fs=44.1kHz at 0dB ) Dynamic range:
117dB ( EIAJ, A-weighted, Fs=44.1kHz ) Signal-to-noise ration:
117dB ( EIAJ, A-weightet, Fs=44.1kHz )Channel separation:
115dB ( Fs=44.1kHz ) 24bit/192kHz Texsas Instruments DAC
8x oversampling digital filter
Low-jitter clock recovery
384 Fs system clock frequency
Jitter attenution down to subsonic frequencies
No processor or mute circuity used in conversion algorithm | 
