Bridging (8 Ohm/4 Ohm Outputs Only) - Extron electronics NetPA Ultra Series User Manual

Standby Selection (via SIS or Control System):
Mode 0: When the amplifier is in Standby Mode 0, the Auto-Standby Timer is disabled and
the amplifier does NOT automatically enter standby mode when no active signal is present
on any amp channel for 25 minutes.
Mode 1: When the amplifier is in Standby Mode 1 (default), the Auto-Standby Timer is
enabled. The amplifier remains active while there is an active signal on any amp channel.
The amplifier enters standby mode if no active signal is present on any amp channel for 25
minutes. It returns to active upon detection of signal on any amp channel. When the SIS
command is sent, the timer resets and the amplifier goes into power save state 1.
Mode 2: When the amplifier is forced into Standby Mode 2 via SIS, DSP Configurator, or a
control system, the unit remains in standby until the amplifier is placed into Standby Mode 0
or 1 the same way, regardless of signal presence.
Mode 3 (not accessible via DSP Configurator or SIS): This mode occurs when the
amplifier begins in Mode 1 and there is no active signal present on any amp channel for
25 minutes. In this mode the amplifier is in standby and can be taken out of standby via an
active signal on any amp channel, DSP Configurator, or SIS.
Mode 4 (not accessible via DSP Configurator or SIS): When the amplifier is forced into
standby via the STANDBY port (contact closure), it remains in this state until the contact is
opened. Once opened, the amplifier returns to its last known standby state. This function
overrides all other standby conditions.
NOTE:
• In Standby mode, the line and Dante outputs are muted.
It is important to note that the auto-standby function relies on active signals that are
•
routed to the amplified outputs. Signals that are routed only to the line or Dante
outputs, but not the amplifier outputs, do not prevent the unit from going into auto-
standby due to inactivity.
• For applications where the line and Dante outputs may be used independently
during long periods of no amplifier activity, such as when the unit is being used as
both an amplifier and off/on-ramp to the Dante network, the auto-standby timer
must be disabled, and the amplifier must not be forced into Standby mode.
Bridging (8 ohm/ 4 ohm outputs only)
NOTE:
terminal and the + output from the even channel becomes negative.
The output power to a speaker can be doubled by bridging the output.
NOTE: Bridging is only available on the NetPA U 1002/1004 low-impedance models.
The minimum load impedance when bridging is 8 ohms.
To bridge the output, follow the steps and refer to the following diagrams.
1.
Connect the IEC power cord and power up the amplifier.
a. Do not plug in any inputs yet.
2. Configure the amplifier.
a. Determine the amplified output pair that used for bridging: 1&2 (NetPA U 1002 or
1004) or 3&4 (NetPA U 1004 only).
b. Determine the input or inputs feeding the output.
c. Route the input or inputs to both outputs.
During bridged mono output, the + output from the odd channel becomes the positive
NetPA Ultra Series • Operation 19