Rear Panel Features; Installation Requirements; Constant Voltage Models And High Pass Filters - Ashly ne8250.25 Operating Manual

Operating Manual - NE Multi Channel Power Amplifier
Amplifier Rear Panel
(continued)
9. Data - These four pins can be wired to remote serial data controllers such as the Ashly WR-5 or RD-8C.
10. Remote Level Control - These pins are wired to potentiometers such as the WR-1 for level control of individual channels
11. AC Inlet - Used for the detachable AC cord supplied with the amplifier.
WARNING: Do not remove or lift the mains connector ground pin.
Installation
Before connecting to mains power, make sure that the switches and wiring are all set to the configuration needed for your par-
ticular application. Failure to do so could result in damage to the unit or to other components in your system.
CAUTION: Before mounting or connecting the amplifier, always disconnect it from AC. Use four screws with lockwashers
when mounting the amplifier to the front rack rails. Rear support is also recommended, especially for mobile or touring use. To
reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
Requirements
NE multichannel amplifiers have specific physical, electrical and signal requirements for proper operation. These requirements
will vary depending on your specific application, setup, and settings on the amplifier. When setting up and testing your system,
please take special care to double check all connections and settings. Refer to the specifications section of this manual for spe-
cific input, output and other figures.
Constant Voltage Models (25V, 70V, and 100V) and High Pass Filters
Amplifiers that are factory configured as constant voltage models (25V, 70V, or 100V) come standard with High Pass Filter (HPF)
hardware installed, allowing for software selectable 80Hz or 400Hz filters on each channel. High pass filters prevent low frequency
energy from saturating the iron core of low cost speaker tap transformers typically used in distributed constant voltage systems. Available
filters are 80Hz @12dB/oct, 400Hz @ 6dB/oct, and OFF. The 400Hz setting is commonly used in paging systems with horn speakers.
Note that with just the standard HPF hardware installed, DSP, network audio, or AES3 input are unavailable.
NE amplifiers shipped with AES3 or network audio, but without DSP, also come with an Ashly OpDAC A/D converter card installed.
This OpDAC converter card offers the same software controlled HPF options as the standard amp.
Note: Constant voltage amplifiers that ship with Protea DSP do not have the standard 80Hz/400Hz HPF circuitry installed, and as
such must have High Pass filters manually set in the software DSP section.
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