Please note that production of the AD1 has been discontinued.
Operating directly at 1 bit, 2.8224MHz, the AD1 | 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”
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. An ultra-low jitter clock source delivers the same precision irrespective of whether it is operated in locked or free-running mode. 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. We call this ‘EMC by design’.
Extensive use of wideband, quiet point-of-load shunt voltage regulators effectively keeps AC currents associated with the operation of analogue or digital circuits local, rendering interference between circuits zero. A choke power supply filter provides clean power to the shunt regulators.
Audiophile construction details, such as selected capacitor types, ‘melf’ resistors and DC coupling, deliver the finishing touch.
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 OC1, converts these signals into the ‘Meitner’ format on ST Optical fibers. Finally, a DSD to PCM converter is under development.
- ultra-low jitter clock source
- EMC by design
- shunt voltage regulators
- choke power supply filter
- audiophile construction details
Hein Dekker, producer for Channel Classics, Baarn (AD1)
Teresa Goodwin, Positive Feedback (AD1)
Steve Hoffman, Audio Fidelity, Los Angeles (AD1)
Chris Fredriksson, HiFi enthusiast, Sweden (AD1)
Yasushi Hamase, Be-Tone studio, Kawasaki City (AD1)
Hiro, Pure Super Audio (AD1)
Yasushi Hamase, Be-Tone Studio, Kanagawa-Ken (AD1)
René Gambini, Lyrinx, Marseille (AD1)
Steve Hall, Future Disc, Los Angeles (AD1)
Ronald Prent, Galaxy Studios, Mol (AD1)
Mark Conese, Ambient Records, Stamford (AD1)
Leo de Klerk, Bloomline Studio, 's Gravendeel (AD1)