Ashly NE8250 - Rear Panel Features; Installation Requirements; Constant Voltage Models and High Pass Filters

7
Operating Manual - NE Multi Channel Power Amplier
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 amplier.
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 conguration 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 amplier, always disconnect it from AC. Use four screws with lockwashers
when mounting the amplier to the front rack rails. Rear support is also recommended, especially for mobile or touring use. To
reduce the risk of re or electric shock, do not expose this apparatus to rain or moisture.
Requirements
NE multichannel ampliers have specic physical, electrical and signal requirements for proper operation. These requirements
will vary depending on your specic application, setup, and settings on the amplier. When setting up and testing your system,
please take special care to double check all connections and settings. Refer to the specications section of this manual for spe-
cic input, output and other gures.
Constant Voltage Models (25V, 70V, and 100V) and High Pass Filters
Ampliers that are factory congured as constant voltage models (25V, 70V, or 100V) come standard with High Pass Filter (HPF)
hardware installed, allowing for software selectable 80Hz or 400Hz lters on each channel. High pass lters prevent low frequency
energy from saturating the iron core of low cost speaker tap transformers typically used in distributed constant voltage systems. Available
lters 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 ampliers 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 ampliers that ship with Protea DSP do not have the standard 80Hz/400Hz HPF circuitry installed, and as
such must have High Pass lters manually set in the software DSP section.
Amplier Rear Panel (continued)