Hear Back OCTO User Guide
OCTO Mixers
OCTO Mixer for Each Musician
Daisy-Chain
Additional OCTO Hubs
Analog Inputs
ADAT Optical Input
AUX IN
The auxiliary input is a 1/8 inch Tip, Ring, and Sleeve
input optimized for +4 dBu input levels. These signals are
summed into the analog section of the Mixer just upstream of
the master volume . The input permits another stereo mix to
be inserted into the audio stream. Examples of use would be
a drum machine click track into the drummer’s Mixer. Another
application would be a stereo mix from a guitar or keyboard
local mix, another Hear Back OCTO Mixer, creating a total of ten
channels controlled from your Mixer.
MASTER VOLUME
The master volume is used to set the volume of the
headphones and the line outputs. When using the line outputs
in conjunction with the headphones, optimize the mix for the
headphones and then adjust the device connected to the line
outputs to balance the gain. Follow the same procedure if using
the AUX input; once the desired mix is obtained, adjust the
source to get the desired level at the AUX input.
CONNECTING THE SYSTEM
1. Connect the appropriate input(s), as shown in the
hook-up diagram below, and select the desired input using
the front panel switch. Connect Mixers to the Hub outputs
using CAT5e cables and set all Mixer controls to “Off”
(full counter-clock-wise position), connect the headphones,
in-ear monitors, and/or line outputs for connecting to
wireless in-ear systems, powered monitors, or other
devices requiring line-level inputs.
2. Apply power to the Hub.
3. Adjust the level at the input source (DAW, Mixer, etc.)
until the clip LED’s on the Hub just come on and then
reduce the input(s) until you have a bright blue LED.
NOTE: Adjust the source for as much signal into the Hub
as possible without clipping. Higher input levels improve
signal-to-noise and dynamic range.
HEADPHONE AMPLIFIER
The headphone amplifier outputs and are paralleled
outputs. When using multiple headsets, the total impedance
should not go below 16 ohms. Optimum headphone amplifier
performance is achieved with a load of 32 to 50 ohms. At 50
ohms, the amplifier is capable of sustaining 2 watts of power!
The headphone amplifiers are very powerful and can easily
damage in-ear transducers, headphones, and your hearing;
exercise great care in adjusting the master volume. The
amplifiers are short circuit protected and have a fault indicator .
WARNING
• The Hear Back OCTO Mixer is capable of driving
most headphones to extreme levels that can damage
your HEARING!
• ALWAYS turn down the Mixer “Master Volume” down
before putting on in-ear headsets or headphones.
• It is the user’s responsibility to prevent hearing
damage by virtue of excessive headphone
“Master Volume” settings.
4. Mixer Adjustment: Once you have the signals optimized,
turn the master volume to about 10 o’clock and then raise
channel inputs 1-8 to the desired levels. Avoid adjusting
the Master Volume too high and running the inputs too low.
NOTE: The HearBus and Mixer outputs contain high speed
digital audio and should be treated as a transmission line.
DO NOT “Y” these connections because the terminated
controlled impedance will be comprised. The HearBus and
Mixer outputs operate at 12.28 MHz.
Now enjoy personal monitoring at its best
and have fun!
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HOOK-UP DIAGRAM
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