Setting the High Pass Filter
Each channel features a high pass ﬁlter (12dB/octave)
that you can turn on or off. You can set individual cut-
off frequencies for each channel's high pass ﬁlter.
Press the Channel Select button to select a
The selected channels' Channel Select button
indicators light up. The channel HPF indicator lights
up when the high pass ﬁlter for the selected channels is
Press the [HPF] button to turn the channel
high pass ﬁlter on or off.
To change the cut-off frequency, press and
hold down the [HPF] button for more than
The [HPF] button indicator ﬂashes rapidly and the
Gain display indicates the cut-off frequency.
Rotate the Gain control to set the cut-off fre-
You can set the cut-off frequency in the range of 20Hz
through 600Hz (in 60 steps).
Press the [HPF] button again.
The [HPF] button indicator returns to the previous
(on or off) status and the Gain display indicates the
Copying the Channel Settings
Follow the steps below to copy channel settings to
another channel. You can copy the following settings:
channel gain, high pass ﬁlter on/off, cut-off frequency,
and phantom power on/off. The gain trim value will
not be copied.
Press and hold down the Channel Select but-
ton of the copy source channel, and press the
Channel Select button of the copy destination
The channel settings will be copied. To copy the same
channel settings to a different channel, continue
holding down the Channel Select button of the copy
source channel, and press the Channel Select button of
the target channel.
Selecting the AES/EBU Format
You can select Double Speed mode (AE1) or Double
Channel mode (AE2) for the AES/EBU format.
■ Double Speed Mode
In Double Speed mode, digital audio data is
transmitted at the current higher sampling rate (i.e.,
88.2kHz or 96kHz). Select this mode if the devices that
support the higher sampling rates receive data.
The [DIGITAL OUT A] and [DIGITAL OUT B]
connectors each output digital audio data routed from
■ Double Channel Mode
In Double Channel mode, digital audio data is
transmitted as mono signals at a sampling rate that is
exactly half (44.1/48kHz) the current higher sampling
rate. The data is handled by two channels. This is
useful when you wish to transfer data from the
AD8HR running at a higher sampling rate to legacy
44.1/48kHz digital devices.
The [DIGITAL OUT A] connector outputs digital
audio data routed from Channels 1–4, and the
[DIGITAL OUT B] connector outputs digital audio
data routed from Channels 5–8. However, if the
AD8HR is running at a sampling rate of 44.1/48kHz,
each connector outputs digital audio data routed from
If the wordclock master is DIGITAL OUT A, the
AD8HR will run at a clock rate that is twice (88.2/
96kHz) the incoming clock (44.1/48kHz).
Turn off the power to the AD8HR.
Press and hold down the [WORD CLOCK] but-
ton and the Channel Select button of Channel
1 or 2, then turn on the [POWER] switch.
Pressing the Channel Select button of Channel 1 will
select Double Speed mode (AE1). Pressing the
Channel Select button of Channel 2 will select Double
Channel mode (AE2). At the same time, the Gain
display will indicate the selected mode (AE1 or AE2)
for one second.