BMC DAC 1 clean

BMC DAC 1

one owner , used in a top caliber system ,
features
• Superlink Interface Solution
• Digital & Analog Inputs
• True Dual Mono Fully Balanced Design
• Current Injection Analog Signal Processing
• Modular Design for Future Upgrades
For receiving digital audio signals besides the established SPDIF-compatible interfaces (AES/EBU 110 Ohm, coaxial 75 Ohm and optical Toslink) there is the exceptional and consequent “Superlink”. Unlike SPDIF transmission the different digital audio signals are not merged into one single signal stream and decoded to separate signals again after being received by the DAC. SPDIF surely makes sense from the commercial point of view, but Superlink is the solution without compromise, which requires 4 times the amount of interconnection cables but skips any coding process. Left/right-clock, bit-clock, digital audio music data are transmistted from the CD-transport to the DAC while the master-clock is generated inside the DAC and sent to the CD-transport. The transmission is done with 4 x 75-Ohm BNC cables with impedance matching.

Superlink results in a more intense link to the music, wider and more realistic sound-stage, more details and beautiful sound colours. Due to the consequent approach of Superlink just the shortest signal path is available and thus the sample-rate-converter (alias SRC, or up-sampler) is not available.

For standard SPDIF inputs the SRC may deliver a better result whenever the source signal includes a noticeable amount of jitter. But due to its digital signal proceeding an SRC adds a certain note to the music signal.

All other options are available for any digital input. Two different digital filters are available with either “Flat” frequency response optimisation or “Pulse” for best dynamic response and with minimised pre- and post ringing. The pulse filter has a soft treble roll off, but avoids specifically the unnatural pre-ringing. In spite of its filter's soft treble roll off, it is generally considered as more transparent sounding.

Furthermore there is a “Low” ( 32fs) and a “High” (128fs) oversampling rate available. Both options have their individual character and are suitable for decent sound tuning. “Low” has a more dynamic and detailed expression, while “High” is softer and smoother.

The digital signal performance is further optimised by a clock synchronisation circuit right in front of the DAC-Chips. All digital signals are re-timed to the local master clock and thus the point of lowest jitter is at the DAC-Chip where the analogue music signal is made.

The conversion is made by two 24-Bit / 192kHz TI/Burr-Brown PCM1792 chips with current output.

The output current is filtered and converted to an output voltage by discrete, fully balanced I/V converters, which operate feedback free. Thanks to the special “Current Injection” circuitry a maximum of sound quality is preserved, which is stabilised with the unmatched “LEF” driver circuit keeping all sonic details.

Originally those circuits were designed to put focus on the sound quality and leave the measurement specifications second, but the present standard is on a level that leaves no need for such a choice: Both are on top level and the sound in a class of its own.

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