AD1

Grimm Audio AD1

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.

Related Products

AD1 Features

  • ultra-low jitter clock source
  • EMC by design
  • shunt voltage regulators
  • choke power supply filter
  • audiophile construction details

AD1 Downloads

AD1 photos

Grimm Audio AD1

A fantastic experience to work with this device.

Hein Dekker, producer for Channel Classics, Baarn (AD1)

Grimm Audio AD1
2018-11-29T17:31:55+00:00

Hein Dekker, producer for Channel Classics, Baarn (AD1)

A fantastic experience to work with this device.
The Grimm DSD and Channel Classics have captured a perfect balance between energy, liveliness and comfortable sound.

Teresa Goodwin, Positive Feedback (AD1)

Grimm Audio AD1
2014-02-19T17:32:10+00:00

Teresa Goodwin, Positive Feedback (AD1)

The Grimm DSD and Channel Classics have captured a perfect balance between energy, liveliness and comfortable sound.
I'm now using a DSD converter called a GRIMM for my SACD mastering. Big improvement.

Steve Hoffman, Audio Fidelity, Los Angeles (AD1)

Grimm Audio AD1
2018-11-29T17:32:21+00:00

Steve Hoffman, Audio Fidelity, Los Angeles (AD1)

I'm now using a DSD converter called a GRIMM for my SACD mastering. Big improvement.
Among all the truly excellent SACDs from Channel Classics, the very best sound quality wise is the Mahler 4th recorded with the Grimm in my opinion.

Chris Fredriksson, HiFi enthusiast, Sweden (AD1)

Grimm Audio AD1
2018-11-29T17:32:36+00:00

Chris Fredriksson, HiFi enthusiast, Sweden (AD1)

Among all the truly excellent SACDs from Channel Classics, the very best sound quality wise is the Mahler 4th recorded with the Grimm in my opinion.
Grimm products have that typically Dutch sound character that I love: warm but clear.

Yasushi Hamase, Be-Tone studio, Kawasaki City (AD1)

Grimm Audio AD1
2018-11-29T17:32:50+00:00

Yasushi Hamase, Be-Tone studio, Kawasaki City (AD1)

Grimm products have that typically Dutch sound character that I love: warm but clear.
The sound of Grimm recorded SACD's is AMAZING, it totally closes the gap between analog and digital.

Hiro, Pure Super Audio (AD1)

Grimm Audio AD1
2012-11-14T17:33:00+00:00

Hiro, Pure Super Audio (AD1)

The sound of Grimm recorded SACD's is AMAZING, it totally closes the gap between analog and digital.
A world class machine!

Yasushi Hamase, Be-Tone Studio, Kanagawa-Ken (AD1)

Grimm Audio AD1
2018-11-29T17:33:11+00:00

Yasushi Hamase, Be-Tone Studio, Kanagawa-Ken (AD1)

A world class machine!
I have used all high end AD converters known to date. Every one of them had a sound to it. Your converter doesn't: it is completely transparent!

René Gambini, Lyrinx, Marseille (AD1)

Grimm Audio AD1
2006-09-20T17:33:21+00:00

René Gambini, Lyrinx, Marseille (AD1)

I have used all high end AD converters known to date. Every one of them had a sound to it. Your converter doesn't: it is completely transparent!
Very impressive.

Steve Hall, Future Disc, Los Angeles (AD1)

Grimm Audio AD1
2018-11-29T17:33:32+00:00

Steve Hall, Future Disc, Los Angeles (AD1)

Very impressive.
Sensational! I have never found this quality in any commercial AD converter.

Ronald Prent, Galaxy Studios, Mol (AD1)

Grimm Audio AD1
2018-11-29T17:33:43+00:00

Ronald Prent, Galaxy Studios, Mol (AD1)

Sensational! I have never found this quality in any commercial AD converter.
The AD1 made the most realistic recording of my piano that I have ever heard. Incredibly realistic and involving.

Mark Conese, Ambient Records, Stamford (AD1)

Grimm Audio AD1
2018-11-29T17:33:53+00:00

Mark Conese, Ambient Records, Stamford (AD1)

The AD1 made the most realistic recording of my piano that I have ever heard. Incredibly realistic and involving.
This is a revelation. It is the first time in my 20 years of digital recording that I hear a fundamental improvement in sound quality.

Leo de Klerk, Bloomline Studio, 's Gravendeel (AD1)

Grimm Audio AD1
2018-11-29T17:34:05+00:00

Leo de Klerk, Bloomline Studio, 's Gravendeel (AD1)

This is a revelation. It is the first time in my 20 years of digital recording that I hear a fundamental improvement in sound quality.