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The mechanical consistency of the BDCD2’s music-optimised, belt-driven flywheel drive is reflected throughout the BDCD2 design.
Superlink, the uncompromising digital connection, employs four separate BNC cables to transmit to the BMC DAC. This works out to one cable per clock and one for the digital audio signal, with the master clock very close to the digital/analog conversion.
Instead of transmitting digital audio signals via 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 to one single signal stream and decoded to separate signals again after being received by the DAC.
SPDIF surely makes sense from a commercial point of view, but Superlink is the solution without compromise. It requires four interconnection cables but skips any coding process. Left/right-clock, bit-clock, digital audio music data are transmistted from the CD Tansport to the DAC while the master-clock is generated inside the DAC and sent to the CD Transport. The transmission is done with four 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 colors.
BMC’s CD transport uses an advanced switching power supply, with active primary voltage filtering and separate transformers for display, motor, logic and audio circuitry on digital and analogue domain.
Additionally there is complex voltage stabilisation separately in front of each functional group.
By adding the digital-to-analogue converter module the belt drive CD transport can turn into a complete CD player with analogue output.
The digital signal performance is optimized by a clock synchronization 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 32-Bit / 758kHz 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 buffered with the unmatched “LEF” driver circuit keeping all the 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 top level and the sound is in a class of it’s own.
Norvett Electronics – Your Local Electricians in East Sussex Since 1955
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