Allen&Heath MIXWIZARD WZ4 USB AUDIO - Manual

WZ 4 16:2 / WZ 4 12:2 / WZ 4 14:4:2 USB multichannel option application note AP8987 Issue 2
ALLEN & HEATH WZ 4 12:2 / WZ 4 16:2 / WZ 4 14:4:2 USB
AP8987 issue 2
Application note for the USB audio option 004-232JIT
Overview
The WZ 4 range of mixers listed above have the option of accommodating a high quality audio card that will send 16 audio
channels to a computer for recording or processing and a return stereo channel for monitoring or effects.
The card neatly mounts within the rear pod of the WZ
4 mixer and the data is available from a USB2 connector at the rear of
the mixer. There are 2 switches on either side of the USB2 connector which change routing options, these are described
below.
The option card must be installed by a technically qualified service engineer. Please see the fitting instructions document
AP8988 for further information on how the audio card is installed.
Specification
The USB audio option module has selectable sample rates of 44.1kHz / 48kHz / 88.2kHz / 96kHz at 24 bit resolution.
The card has been tested with the following operating systems to ensure compatability:
Windows XP 32 & 64 bit
Windows Vista 32 & 64 bit
Windows 7 32 & 64 bit
Windows 8 32 & 64 bit
OS X 10.5 Leopard
OS X 10.6 Snow Leopard
OS X 10.7 Lion
OS X 10.8 Mountain lion
For questions about compatibility with other operating systems please contact our technical support team via the Allen &
Heath website:
http://www.allen-heath.com/support
This interface card has been tested with a variety of computers and operating systems.
With the higher sample rates (88.2 & 96 kHz) we recommend that you take some time to optimise your system latency set-
tings to ensure that no clicks or dropouts are added to the recorded data.
For higher immunity against bandwidth related timing issues, we recommend operating at 44.1 or 48kHz sample rate.
Buffer Size Sample rate kHz Latency mS
64 48 9
256 48 30
64 96 7
256 96 20
Buffer Size Sample rate kHz Latency mS
64 48 8
256 48 19
64 96 7
256 96 14
Typical round trip latency readings
PC
MAC
Analogue headroom from nominal (0dBu) 19dB
Digital
headroom from nominal (-20dBFS) 20dB
Frequency response
+0.25/-0.5dB 20Hz to 20kHz
THD+N (22Hz to 22kHz) Input to output, +10dBu, 1kHz,
48kHz
sample rate 0.007%