Rear Panel Features - Ashly Pema 8250 Operating Manual

Operating Manual - Pema Protea Equipped Media Amplifi er

2.5 Rear Panel Features

1. Ethernet Port - This RJ-45 connector allows Ethernet control and monitoring of the amplifi er using Protea
2. Phantom Power Switch - This switch applies +15V phantom power to channel 1-4 balanced inputs. A separate switch
is used for channels 5-8.
3. TEL-PBX Switch - This switches between Mic/Line and PBX analog input for channel one only. When switched to
TEL-PBX, a 600 ohm isolation transformer is inserted into the channel one input signal path. This transformer is designed for
limited bandwidth audio from a telephone paging system.
4. Balanced Mic/Line Input - This is used for a three wire (G, +, -) balanced analog input, and uses Euroblock connec-
tors. If an unbalanced input signal is to be connected here, wire the signal to (+), the input ground to (G), and connect (-) to (G).
5. Unbalanced Summed Mono Input - This pair of RCA jacks is used for analog line level (-10dBv) input, and sums a
stereo signal together for that input. Note: Unbalanced line level sources may reference their outputs to a different ground than
the Pema amplifi er, creating the potential for ground loop hum. Always use short cable lengths for unbalanced signals, routed
away from AC, video, or data cables, and make every effort to use a common grounding point for all devices. In the event there
is still ground loop hum, isolate the unbalanced input signal by using an in-line isolation transformer.
6. Digital I/O Slot – Installation of this option allows this amplifi er to be part of a CobraNet or EtherSound digital audio
network.
7. Preamp Outputs - These Euroblock connectors provide access to post-DSP preamp signals for each channel, and are
used to drive other amplifi ers or processors with the same signal that is driving the power amplifi er. The preamp outputs are
pseudo-balanced, meaning they use single ended signal with balanced impedance, and can be wire balanced or unbalanced.
8. AUX Outputs - On four channel amplifi ers only, the four AUX outputs offer additional and independent post-DSP
signals for driving other amplifi ers or processors. AUX outputs are pseudo-balanced.
9. Euroblock Speaker Connectors - Used to connect the speakers or distributed line transformers, depending on model.
10. Remote Standby - These two contact closure pins are wired to a switch to remotely place the amp in standby.
11. Preset Recall - These four pins (using remote standby GND) can be wired to remote contact closure switches to recall
one of the fi rst four amplifi er stored presets. Preset recall function is defi ned within Protea
12. Data - These four pins offer serial data control and can be wired to Ashly remote control devices such as the WR-5 or
RD-8C. Ashly also offers an in-line converter called the INA-1 that allows the Data Port to be used with other RS-232 controllers.
13. Remote Level Control - These pins can be wired to remote 10kΩ potentiometers such as the Ashly WR-1 for DC
level control of individual channels.
14. AC Inlet - Used for the detachable AC cord. Use only the Ashly Audio factory supplied AC cord.
15. Model Information - This sticker tells the model name, mains voltage, and mains power/current consumption.
WARNING: Do not remove or lift the mains connector ground.
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