Danh mục tin
mbl C31 CD-DAC
CD-DAC mbl C31
The C31 is the CD player, and D / A converter of the Corona family of the German MBL. In addition to a phenomenal CD drive, this player is equipped with an optical, one coaxial and an asynchronous USB input, which also benefit other sources of fluid D / A converter in this player. Via the USB input can be connected to a computer to stream your entire music library ripped.
To summarize, the CD31 can just as reasonably be considered a DAC with transport. It’s a slot drive loader but has inputs for USB, Toslink and SPDIF with both RCA and XLR outputs. The DAC supports sampling rates up to 24-bit/96kHz resolution, and no higher but MBL’s designer Jürgen Reis responds by citing the superior jitter performance of his DAC design, and the psycho-acoustically optimized filtering and the measured timing accuracy that is the equivalent to a 192kHz sampling rate. The output of the USB signal has a very low jitter in part due to MBL’s Master Clock Mode which is similar to asynchronous USB. Internally, the digital inputs and outputs employ galvanic isolation between each other and ground to prevent high frequency eddy currents. High precision buffer data reading is provided by the combination of digital frequency synthesizer and nested analogue phase lock loop (PLL).
The mbl CD31 reminds me that there is still a whole lot of life left in the 16-bit/44.1kHz compact disc, that all discs (like all vinyl LPs) are not created equal and that it’s easy, even lazy to jettison a proven and well-supported format like the compact disc for the latest greatest thing–namely computer audio. Streaming sound quality via USB is no slam-dunk, nor a newly discovered digital panacea. And even many downloads of the highest sampling rates or average recordings and so-so remasterings often offer no sonic advantages to the so-called lower rez versions including 16/44.
SPECIFICATIONS
Technical data - General
Weight | 15,5 kg / 34.2 lbs |
Dimensions (without cables) | W 45,0 cm / D 44,5 cm / H 14,5 cm |
Dimensions with packaging | W 59,0 cm / D 54,0 cm / H 35,5 cm |
Technical data - Digital Inputs
1 x Toslink | |
Connection | Snap-In-Type |
Wavelength | 650 nm |
Nominal Input Power | 10mW |
Working input power range | 3mW - 30mW |
electrically/galvanically Isolated | optically isolated |
1 x S/P-DIF | |
Connection | RCA |
Input Impedance | 75 Ohm |
Nominal Input-Level | 0.5 Vpp |
Working Input-Voltage Range | 0,2 - 5 Vpp |
USB Input | |
Connection | USB Type B |
Sampling Frequency | 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz |
Mode | MCMI (Master Clock Mode Interface), Asynchronous USB |
electrically/galvanically Isolated | galvanically isolated |
Operating System Drivers | Natively supported, without any special driver |
Technical data - Digital Outputs
1 x S/P-DIF | |
Connection | RCA |
Output Impedance | 75 Ohm |
Nominal Output-Level | 0.5 Vpp |
Electrically/galvanically Isolated | galvanically isolated |
Analogue Outputs | |
Maximum Output Level | Unbalanced RCA Out: 2 V @ 0 dBFS Balanced XLR Out: 4 V @ 0 dBFS |
Output Impedance (RCA / XLR) | 100 Ohm / 200 Ohm |
Absolute Phase (RCA / XLR) | In-Phase / Pin-2 = In-Phase |
Total Harmonic Distortion (THD) | < 0.001% @ 0 dBFS |
Signal to Noise Ratio (RCA / XLR) | > 110 dB (A-Weighted) @ 0 dBFS |
Channel Separation | > 100 dB @ 1 kHz |
Technical data - DAC Section
Resolution | 24 Bit |
Sampling Frequencies | 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz |
D/A Converter Type | Multi-Bit Delta Sigma |
Jitter Reduction | Digital/Analog Dual Nested PLL for effective jitter reduction |
Digital Oversampling Filter | Psychoacoustic optimized filter of 4/5 Minimum Phase and 1/5 Linear Phase |
Analog Output Filter | Group Delay Optimized Bessel Filter @ > 40 kHz |