Overview; Protection - Ashly ne4250 Operating Manual

Operating Manual - NE Multi Channel Power Amplifier
The basic NE multichannel amplifiers come in either four channel or eight channel configurations, with Euroblock input
connectors standard or optional XLR connectors. Output connectors are Euroblock only. Standard features on all models include
balanced analog inputs, bridge mono mode per channel pair, full ethernet control using Protea
power up, contact closure preset recall, remote control through micropocessor based devices such as the Ashly WR-5, RD-8C,
or other custom control, and DC remote level control using an Ashly WR-1.
Additional hardware options for the NE multichannel power amplifiers include the following:
1) Internal DSP Processing - With this factory installed option, and using Protea
amplifier input channel can be configured with pluggable DSP blocks to have its own dynamics control, gain functions, graphic
and/or parametric EQ, Hi-pass/Lo-pass filters, time delay, metering, and test signal generator. A mixer section with assignable
routing allows any input to drive any or all amplifier outputs. Outputs have the same DSP functions as inputs, with the addition
of a fast, automated crossover setup. Both inputs and outputs can copy/paste their settings to other channels, or can link with
one or more other channels to track their settings.
Presets can be used to store and retrieve global parameters of an entire amplifier's control surface and DSP section from a
file. In addition, Sub Presets allow for a collection of individual DSP function parameters within and across multiple channels
of an amplifier to be stored and recalled as a set, affecting only those parameters and channels which have been tagged. Up to
35 presets/subpresets can be stored within the amplifier, and can be recalled in real time from a computer, WR-5 remote control,
or contact closure switches (up to four).
2) AES/EBU Input - Using an optional four or eight channel input card, NE multichannel amplifiers can accept AES/
EBU digital inputs. This protocol allows 2 channels of digital audio to be transmitted over a single cable, thus maintaining a
completely digital signal path until just before the power amplification stage. 48kHz & 96kHz data rates are supported.
3) MIC Inputs - In conjunction with the factory installed DSP option, four analog MIC inputs can be installed (instead
of AES/EBU) for full gain, mixing, and dsp processing capabilities using Proteane software.
4) Network Digital Audio (Cobranet) - This option allows the NE multichannel amplifier to be part of a networked
audio distribution system. CobraNet is a technology developed and supported by Cirrus Logic (www.cirrus.com). It is a com-
bination of software, hardware and network protocol which allows distribution of multiple channels of real-time, high quality
digital audio over a standard Ethernet Network. For detailed information about CobraNet or its implementation or installation
please visit www.cobranet.info.

Protection

Ashly NE multichannel amplifiers come standard with several protection circuits:
Over Current Protection - Is controlled in the output stage.
Thermal Protection - When the internal temperature is below 40°C the fan runs at its slowest speed. Above 40°C the
speed is increased until it reaches its maximum value. If the temperature exceeds 100°C, the input on that channel is reduced.
If the temperature exceeds 120°C, the power supply is switched off.
Mains Protections – protection within the power supply includes: Inrush Current Limitation during power up, Mains
Over Voltage Detection, and internal Mains Fuse Protection. To protect the Mains fuse against AC overcurrent due to excessive
audio output current, there is a protection scheme controlled in Protea
which reduces audio output level until the overcurrent condition is no longer present.
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software, remote standby for
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(network enabled) software, each
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software and indicated on the amplifier front panel
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