Product manual

FAQs
What is an expansion bus reference and why must I define it?
When multiple units are linked together, all microphones should typically be sensing the same audio for
echo canceling. That audio is usually summed on a specific XAP unit to a specific output channel or
virtual reference channel. All the linked units must know which unit and channel has the summed audio
for echo canceling. It is through the Define PA Adapt/AEC Expansion Bus Ref window that the linked
units are instructed as to which unit has and which channel is the echo reference channel.
How do I define an expansion bus reference?
Open the Inputs 1-8 (1-4 for XAP 400) window. Click on the AEC button for the microphone you are
configuring. Select one of the four expansion bus references from the PA Adapt and AEC Reference list.
The Define PA Adapt/AEC Expansion Bus Ref utility opens. Using the drop-down lists, define the unit and
output for the expansion bus reference you are using. More information can be found in the product
manual or the G-Ware help file.
Installation
How do I reset my XAP unit to default?
1. Unplug expansion bus cables.
2. Unplug power cable.
3. Press and hold the Meter button (on front panel of unit).
4. Plug the power cable back in.
5. Release the Meter button when the unit finishes its boot up process and the LCD display reads
Inputs. All custom configurations have been removed and the unit has been reset to factory defaults.
Can I connect a XAP unit to an AP unit?
No. The XAP and PSR1212 units are not compatible with AP units.
What does it mean when my +12 LED and Mic On LEDs 1, 2, 4 and 8 are flashing?
You have two of the same type units with the same device ID. Assign a new, unique device ID to one of
the units.
Can I use push-to-talk microphones with the XAP, PSR or AP products?
You can use push-to-talk or push-to-mute microphones with ClearOne's audio conferencing products.
However, they must be connected properly to avoid bypassing the echo canceller. The echo canceller is
constantly sampling the room, even when the microphone is muted through the conferencing device. PTT
microphones will mute at the microphone element, preventing the echo cancelling device from sampling
the room. If the mic element is suddenly turned off or on, the echo canceller must try to adapt to the
change. The echo cancelling circuit, however, might not be able to converge quickly to such a large level
change. The callers might hear echo or feedback might occur. If a push-to-talk feature is required for the
microphones, the control wires should be connected to the unit's Control/Status port. This will mute the
microphone through the echo cancelling unit so it can continue to sample the room. With the microphone
control wires connected to properly configured Control/Status pins, the echo canceller unit can properly
track level changes from the microphones.
The units seem to run hot, is that a problem?
No. However, it is always a good idea to design the rack with adequate airflow or ventilation.