User's Manual

User’s Guide ADI-2 Pro FS – v 2.5

14.1.2 Clock

Clock Source

Choices are Auto, INT (Internal, Master), AES, SPDIF.

Sample Rate

Choices are 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384,

705.6 and 768 kHz. When clocked externally the ADI-2 Pro

supports the same sample rates.

When using 352.8 or 384 kHz sample rate the level meter display shows a single channel of

audio sent out from SPDIF, or received in case a signal of 192 kHz sample rate is attached. The

reason is that the ADI-2 Pro includes a special SMUX mode. When run at Octa Speed, the ADI-

2 Pro will split the data of the left analog input channel to the AES/SPDIF output channels left

and right, at half the sample rate – 192 kHz. Using measurement software like HpW Works

(www.hpw-works.com) which supports this mode (2x speed), and any 192 kHz capable RME

audio interface, one can perform analog measurements with 384 kHz sampling rate bandwidth

over SPDIF – of at least one analog channel. The advantage compared to a direct USB connec-

tion: using SPDIF optical the tested device is galvanically isolated from the measuring system

(interface/computer).

14.1.3 Device Mode / DSD

Basic Mode

Choices are Auto, AD/DA, USB, Preamp, Dig Thru and

DAC. See chapter 17.

CC-Mode

Choices are Stereo and Multi-channel. The ADI-2 Pro

supports two Class Compliant modes: 2 channel I/O, which

allows to use sample rates up to 768 kHz even with iOS

devices, and 6/8 channel mode to give access to all I/Os

simultaneously. In multi-channel mode the sample rate is

limited to 192 kHz. To be able to change the mode USB

must be disconnected.

Dig. Out Source

Default, Main Out. Copies the signal Main Out 1/2 (including EQ and volume) to the digital out-

puts AES and SPDIF/ADAT. Useful when connecting active monitors with digital inputs.

DSD Direct 1/2

OFF, ON. Default: OFF. When activated a DSD playback will use DSD Direct mode over the

rear outputs 1/2. As DSD Direct bypasses all DSP calculations and volume control, the only

way to change the output volume is by setting different reference levels. Therefore in DSD Di-

rect mode Phones outputs 1/2 are disabled.

DSD Filter

When DSD Direct mode is active, high-frequency noise filters reduce out-of-band noise, which

might have negative impact on other equipment. While 50 kHz is optimized for DSD64 and 150

kHz for DSD 128 and 256, the user can freely try both at any DSD rate.

DSD Detection

Default: ON. Option to deactivate the automatic DSD detection on SPDIF, AES and USB.