Ashly ne4800 Manuale - Pagina 8
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Operating Manual - ne8800, ne4800, ne4400 DSP Processor
The NE processor defaults to "Auto Selection" which automatically detects a Network, Word Clock, AES3, or Internal
master clock source and automatically switches, in this order of priority. Therefore, in most system configurations, the user
doesn't need to worry about the master clock source, the processor will automatically pick the best master clock from the high-
est priority available . The processor will mute all audio outputs for about one second when it switches master clock sources .
This Auto Selection mode can be over-ridden in the control software by clicking on <Device Options, Sample Rate & Master
Clock Selection> .
The word clock switch on Ashly equipment provides two functions. First, it routes the word clock input signal hard-wired
looped-through to the word clock output jack when in the OUT (Loop) position, but breaks the signal and generates an internal
word clock source in the IN (Term) position . Secondly, the OUT position does not apply any load to the looped-through word
clock signal, but the IN position applies a 75 ohm termination to the word clock input and supplies a 75 ohm source impedance
to the word clock output . Therefore, the word clock switch should be in the IN "term" position whenever the unit is at either
end of the word clock line, and in the OUT "loop" position when placed anywhere else along the line . No external terminations
are needed .
9. Factory Reset - To reset the NE processor to original factory settings and permanently erase all stored preset data from
the unit, use a paper clip or similar object to depress the recessed switch and hold for six seconds during power up . Factory reset
is complete when all channel LEDs on the face panel are lit .
10. AC Inlet - 90-240 VAC, 50-60Hz, 70W, detachable AC cord. Do not remove or lift the mains connector ground.
11. Power Switch - This switch applies and removes power to the unit .
8 OPTIONAL BACK PANEL FEATURES
12. Mic Input Channels - High performance mic inputs are available as factory installed options for channels 1-4, and/
or 5-8 . Mic input connections are balanced euroblock, with switchable +48V phantom power . When a mic preamp option is
installed, the <Input Source> tab appears in the software and represents the mic preamps as available input sources with an icon
labelled <Pre> . Mic preamp gain of 0dB, +20dB, +40dB, or +60dB is set in the input source menu by clicking on the preamp
icon for a given channel and checking the appropriate gain .
Some microphones in paging applications have a button/switch which the user must push in order to use the microphone .
This button acts as a contact closure which is wired to a logic input and used to control mute and ducking functionality . When
the <Push To Talk Mic> box is checked in the input preamp section, that channel's mic will only be unmuted when the assigned
logic pin's contact is closed (the button is pressed) . Note: the push to talk mic feature mutes the mic channel and indicates its
status by turning the mute button orange . Manual mute will still override the push-to-talk unmuting of that channel . Also, if that
mic is also a ducking trigger, it will trigger the ducked channel level reduction immediately, regardless of the mic input level .
13. AES3 Input Channels - AES3 (AES/EBU) is a digital audio format where two channels of digital audio are transmit-
ted over a standard mic cable . Depending on the option installed, the AES3 input expansion card receives four or eight channels
of audio which can then be routed, processed, and distributed . When an AES3 input is installed, the input source select tab
allows for exclusive selection of AES3 input, as well as selection of AES3 with analog backup in the event there is no digital
input signal . AES3 has a cable length limitation of about 100 meters depending on cable type and impedance ratings . Refer to
the AES3 specifications for detailed line impedance and impedance matching information.
14. AES3 Outputs - AES3 outputs, if installed, always carry the exact same audio signals as the line outputs, except in
AES3 format . There is no access to AES3 outputs in software .
15. Network Audio Card - Ashly currently supports Dante and CobraNet network audio options, offering a full featured
audio interface portal into or out of the larger audio network . See the NE software section on network audio for further imple-
mentation details .
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