HUB INPUTS
1. ADAT®
The ADAT input (5) can be connected to digital audio
workstations, digital recorders, or digital mixers using a
standard TOS-Link optical cable. For front of house or remotely
located digital mixers, use a Hear Technologies Extreme
Extender ADAT IN* that converts ADAT optical, which is limited
in distance, to the HearBus for transmission of up to 500 feet.
Use Hear Technologies Optical cables available in 6, 12, and
25 foot lengths.
*ADAT Extreme Extenders In/Out are available for converting from ADAT to
Optical to HearBus and from HearBus to ADAT Optical.
2. HearBus™
The HearBus permits daisy-chaining of multiple hubs up to
500 feet apart using the HearBus input (6) and HearBus
output (7). This HearBus is great for inter-studio or stage-to-
stage connections, as well as daisy-chaining for very large
systems. Use Hear Technologies CAT5E cables, which are
available in 2, 12, 25, 50 and 100 foot lengths.
3. Analog
Analog inputs (9) are fully balanced and are connected using a
standard TASCAM DA-88 style Analog cable, such as the Hear
Back Analog cable.
DB25 cable pin-outs are wired as shown below:
INPUT SELECTOR SWITCH - The input selector switch (2)
gives the user a simple way to select any one of the three input
sources without a patch bay, router or rewiring.
HUB OUTPUTS - The hub has mixer outputs (8) which each
deliver digital audio, ground and +/- 18VDC. Each of the eight
hub outputs must be home run to a mixer, with a maximum
distance of 200 feet. Outputs not in use should be disconnected
at the hub.
MIXER RJ45 PINOUTS
Pin Function Pin Function
1 Digital Audio + 5 -18VDC
2 Digital Audio - 6 Ground
3 Ground 7 +18VDC
4 +18VDC 8 -18VDC
Each of the eight hub mixer outputs has a solid-state
automatically resettable fuse in-line with the power supply
outputs to prevent power supply damage. In the event of a
shorted cable or broken mixer, the PTC fuses go to high
impedance permitting other mixers to function while protecting
the power supply from the faulty output.
The main AC input is connected using a standard IEC320 cable.
The universal power supply is designed to operate from 90 to
264VAC at 50 to 60Hz. The AC input circuit is internally fused.
A front panel power switch (3) is provided for convenience.
INPUT METERING - The hub features a unique input metering
circuit consisting of three LED's for each of the eight input, while
providing four visual levels. The middle blue LED's operate at
two different brightness levels. The green LED indicates -32 dBu
signal presence, the blue at -10 dBu (dim) and +4 dBu (bright)
and the red clip LED operate at +16 dBu.
INTERNAL FAN - The internal temperature-controlled fan
operates whenever the power supply temperature reaches 60
o
C
or 140
o
F. In studio or indoor use, the fan should rarely come on.
The hub should be rack mounted away from high temperature
devices such as power amplifiers.
RL
LINK
RL
LINK
RL
LINK
RL
STEREOMIXER
RL
LINK
RL
LINK
RL
LINK
RL
STEREOMIXER
FRONT PANEL
1
5 6 7 8 9
10
2 4
5
6
7
8
9
10
1
2
3
4
Four-Level, 3-LED Input Metering
Input Selector Switch
HearBus Clock Status Indicator
AC Power Switch
AC Power Entry
ADAT Optical Input
HearBus Input
HearBus Output
Hear Back Mixer Outputs
Analog Inputs
HUB FEATURES
• Three switch selectable 8-channel input sources:
ADAT Optical, Analog, HearBus
• 24-bit A/D converters
• Digital input sample rates: 44.1 KHz or 48 KHz
• Less than 1.5 milliseconds total system delay (latency)
• 3-LED four-level metering
• Standard CAT5E - delivers power and signals to mixers
• Daisy-chain for very large systems
• Internal, internationally approved universal power supply
• Quiet, temperature controlled fan (only runs when power
supply temperature reaches 60
o
C or 140
o
F)
• 1 RU chassis
5
6
7
9
2
8
3
CAUTION: Use only DA-88 Analog. Do not use TDIF.
3
REAR PANEL
WARNING:
NO USER SERVICEABLE
PARTS INSIDE
ADAT IN HearBus
IN
NOT FOR MIXER
MIXER OUTPUTS
ANALOG INPUTS
HearBus
OUT
NOT FOR MIXER
MIXER OUTPUTS
DA-88 ANALOG CABLE
FUSE: 1A @ 115VAC,
0.5A @ 230VAC
50 / 60 Hz
TM
!
1704
HOOK-UP DIAGRAM STEREO LIVE - DIGITAL
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