No Signal Verify power is on.
Check input connections and input selector switch.
Verify the hub and mixers have green clock status indications.
Check output devices, headphones, wireless transmitter/receiver, monitor amplifiers, etc.
When I connect a line level
device to the mixer line
outputs, I hear a buzz.
Wire TRS outputs using only black (ring - ) and red (tip +) wires.
Disconnect shield at the mixer and terminate at receiving end only.
For unbalanced outputs wire the Black (ring - ) to the receiving end sleeve and tie the shield at the
receiving end only. Connect the tip (+ red) to the tip at the receiving end.
Setting the limiter
Set the limiter so it only activates in the presence of an excessive input signal. The limiter should only
be active in the event of excessive signals and should NOT be on when normal signals are present.
I have a clock signal at the
hub, but nothing at the mixer.
Isolate the problem as follows:
Check CAT5E cable or try another cable.
Try another mixer output port on the hub.
Try another mixer.
When I link two mono channels,
the stereo spread is incorrect.
Verify the source (mixer, DAW, etc.) has these outputs panned hard left and right. The pan control of
the source determines the stereo spread.
The headphone amplifier fault
indicator is on.
The fault indicator indicates either a short circuit or excessive load.
I need more mixes. Connect the stereo mix (channels 1&2) with the FOH or control room mix across several hubs (as
many as desired) then provide the "more me" sectional mixes to channel 3-8 on each hub until the
desired number of mix's are met. See "Large Stereo System" hook-up diagram, page 15.
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.
If you need further assistance, feel free to contact Hear Technologies technical support at 1-256-922-1200.
TROUBLESHOOTING AND OPERATING TIPS
The fan does not operate.
How to parallel channels 1 & 2
(stereo inputs) across multiple
"Master Hubs" as shown in
the "Large Stereo System"
hook-up diagram on page 15
The fan only runs when power supply temperature reaches 60
o
C or 140
o
F.
After connecting the stereo mix to channels 1 and 2 at each hub - Connect master hub #1, channels 3-
8 for band mix, connect master hub #2, channels 9-14 for vocals section, connect master hub #3,
channels 15-20 for horns ... you get the idea, right! By using the HearBus outputs on the master hubs
and connecting them to the slave hub HearBus inputs, you can obtain as many mixing stations of each
master mix as desired. Since each hub may be daisy chained a minimum of 32 times, this example
system yields 3 master hubs x 32 slave hubs = 96 hubs, then 96 x 8 = 768 mixers!
NOTE: When "Y" connecting multiple hub inputs, one must be concerned with the total impedances.
The hub inputs are 18K ohms balanced. Since the input to output impedance ratio should be at or
above 10:1, there are a couple of rules to follow: Assuming a mixer source impedance of 180 ohms,
the following applies: 18000/1800 = 10.
Where: 18000 = source impedance
1800 equals ten times your source impedance
10 = 18000/1800 is the number of hubs that meet the required impedance
Therefore, you can parallel up to ten master hubs to a quality BALANCED line output. In the event you
experience problems or if you have an unbalanced output, obtain a high quality, balanced audio
distribution system. We don't recommend using unbalanced sources for this connection scheme as
hum loops will occur.
HOOK-UP DIAGRAM CHURCH - ANALOG
0912
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