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B.M.C. BDCD1.1 Belt Drive CD Player Transport - $4990.00 USD
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Quick Overview
A CD transport with a belt drive is a truly uncommon concept.
The highest grade analog record players share both a belt drive and high inertia. And not without reason, for this is the
only way to create a turntable with perfectly smooth rotation and tranquillity. A patented belt drive with high inertia, in
the form of an acrylic-stabilizer, applies this principle to B.M.C.'s BDCD1.1 CD Belt Drive Player/Transport.
The massive CNC milled aluminium main frame and the acrylic stabilizer are the major upgrades from BDCD1 to
BDCD1.1. In addition to constant rotation, the stabilizer reduces vibrations of the CD. The result is an inner peace and
authority unachievable by a lightweight, relatively nervous-sounding direct drive.
Belt Drive is More Than Just a Belt
1. Belt drive decouples the motor vibration from the CD
2. The CD turns on a precision bearing, analogue to a turntable bearing
3. A CD stabiliser removes vibrations and resonances from the CD
4. Due to the high inertia of the stabiliser any rotation is quiet and smooth.
5. Quiet operation of the servo circuit instead of plenty small and harsh speed changes.
According to this short description it should be understandable that mid and high frequency jitter won't ever happen.
The mechanical consistency of the BDCD1.1's music-optimized, belt-driven flywheel drive is reflected throughout the
BDCD1.1 design. Superlink, our uncompromising digital connection, employs four separate BNC cables to transmit to
the B.M.C. 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. The result: natural-sounding music. An optional, and built-in, Digital/Analog
Converter Module stands out due to the extremely short and distortionless Current Injection and Load-Effect Free
analog circuitry and contributes further to the music's impression of effortlessly unfolding. The result: Music no longer
sounds digital, but warm, open and powerful, as if it were from a superior analog sound source. BDCD1.1: Simply the
quintessence of both worlds.
Description
B.M.C. applies exceptional concepts to their components to make technical innovation and perfection serve music
reproduction. One truly uncommon concept is a CD transport with belt drive. Why should a belt drive be applied
although almost all other CD player work with direct drive? Just measurement results don't really serve as a decision
maker, but this was already true in analogue ages: In measurement the direct drive turntables outperformed the belt
drive, just in terms of sound within the higher grade class of turntables belt drive types outperformed their direct driven
counterpart clearly. In the case of CD players the situation seems to be quite similar, but there is one major difference:
While turntables rotate with a constant velocity a CD player constantly adjusts the speed depending on the play time
position for a constant data stream. Sometimes this fact is regarded as an argument against belt driven CD players, but
the speed changes are slow and continuous and thus a belt drive can technically manage this challenge. Rapid
changes in speed just happen during title skip. Naturally a belt driven, flywheel-type CD player reacts somewhat slower
here. But sacrificing a higher level of musical enjoyment for faster track access times? This might be too
disadvantageous a sacrifice. According to this short description it should be understandable that most mid and high
frequency jitter won't ever happen.
Superlink & SPDIF Interfaces
For transmitting 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 to 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 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.
Power Supply
Any digital or analogue circuit has a sonic dependency on the power supply. Due to the fact that different power
supplies have different influence on the music reproduction B.M.C.'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.
Optional Upgrade to a CD Player
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 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 in 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 choice: Both are on top level and the sound
is class of their own. The combination of a belt driven CD transport (belt-drive, precision bearing, CD stabiliser with
flywheel effect) and consequent digital signal interconnection, as well as an optional DAC with advantageous
technology concludes in a musical performance never revealing its digital origin.
Features
The BMC Concept:
• No Inflated Retail
• High Value for Money
• Most Models Upgradeable
• Innovative Designs Serving Music
• Benefits in Sound by Technology with BMC sets
B.M.C. Belt Drive CD Player / Transport
• Top Loading Design
• Superlink Interface Solution
• Belt Drive Player with Flywheel
• 50 Micron Tolerance Precision Bearing
• Modular Design for Future Upgrades
Specifications
Frequency Response:
20Hz - 20kHz
Output Impedance:
50 Ohms
Output Voltage:
4V rms
THD:
0.003% ~ 0.006%
S/N Ratio:
-115db
Analog Outputs:
Balanced XLR + Unbalanced RCA
Digital Outputs:
Superlink, AES/EBU, Toslink, Coax, BNC
Dimensions:
17.1 x 3.9 x 13.8“ (WxHxD)
Weight:
19.8 lbs.
Content of Packing:
- BDCD1.1 Unit
- CD Stabilizer
- Power Cord
- 4 Superlink BNC 75 Ohm Cables
- Remote Control w/Batteries
- Owners Manual
Thank You.
Drew Baird, P.E.
Moon Audio
140 Iowa Lane
Suite 204
Cary, NC 27511
919-649-5018
drew@moon-audio.com
http://www.moon-audio.com
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