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Grimm AD1
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Operating directly at 1 bit, Grimm is eminently suitable for creating SACD masters from analogue sources. Additonally, DSD processing DAW's will find no better front end. Combined with our DD1 digital converter, the AD1 offers the best CD rate converter performance available.
In order to get past the limitations posed by commercially available converter chips, the AD1´s converters are made with discrete parts. The input circuitry before the modulator consists of only two resistors. This strategy pays off with unparallelled low noise and distortion, while delivering data that can be directly pressed onto SACDs or processed in a DSD workstation.
Maximising the converter´s capability are a plethora of design techniques such as:
- an ultra-low jitter clock source delivering the same precision irrespective of whether it is operated in locked or free-running mode;
- EMC by design. From the very first planning stage onwards, parasitics were considered as an integral part of the circuit, not something to be worked around at the end of the development cycle;
- extensive use of wideband, quiet point-of-load shunt voltage regulators that effectively keep AC currents associated with the operation of analogue or digital circuits local, rendering interference between circuits zero;
- choke power supply filter, providing clean power to the shunt regulators;
- audiophile construction details such as selected capacitor types, 'melf' resistors and DC coupling.
The AD1 is constructed modularly and is available in 2 to 8 channel versions, cascadable for an unlimited number of channels. The outputs are SDIF3 compatible. A companion box, the DD1, converts these signals into various PCM formats through nonaliasing, ripple-free decimation filters. The DD1 is planned for release Q2 2007.
Features:
(20kHz noise bandwidth)
Channel count: 2 to 8 (upgradable) per chassis. Unlimited stackability.
Signal-to-Noise Ratio: 117dB (min).
THD+N: 115dB at 0dBfs, 107dB at -10dBfs, 57dB at -60dBfs.
Input level: 18 dBu for 0dBfs (50% modulation index).
Input impedance: 8.8kOhms.
Output format: SDIF3.
Clock options: Master, Slaved to 44.1kHz sync input.
Sync output: 44.1kHz.
