Mirage Digital Evolution
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www.aev.eu [email protected]
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Section 10 - Connections
It is recommended that the input and output connections are made with high quality and flexible
cables, with good shielding.
Particular attention should be paid to the grounding of the machine and the quality of the power
supply.
Earth connections. Earth connections and chassis between the units must be kept separate in order to
avoid interference caused by mass loops.
10.1 Positioning
The audio processor circuits produce a signal that is pre-emphasized with 50µs or 75µs curves and
precisely processed to avoid excessive modulation; the signal
Is then filtered to 15 KHz to protect the 19 kHz pilot tone, (10 KHz for the AM model)
If the processor's two-channel output signal is input to an external stereo encoder,
It is advisable not to introduce any other device that may alter the bandwidth and increase modulation
peaks compared to the average value.
Frequency response errors and variable delays are typically introduced by equalizers, line transformers,
low-pass filters 15 kHz and pre-emphasis networks in stereo encoders.
It is therefore appropriate, first of all, to bypass all low-pass filters and pre-emphasized circuits
Present in normal stereo encoders.
Low-pass filters, high-pass filters, transformers, distribution amplifiers, and long transmission lines can
alter the signal with the above-described consequences.
It is therefore clear that the criteria for the optimum peak modulation level above outlined,
Can be more easily satisfied if the audio processor directly powers an internal stereo encoder.
It is therefore strongly recommended that the processor be used with its own internal stereo encoder,
wherever possible.
10.2 Inputs / Outputs
XLR inputs have selectable impedance between 600Ω and 10kΩ.
The input signal range ranges from -20 dBm to +10 dBm.
The XLR outputs are electronically balanced with an impedance of 100 Ω.
The output range ranges from 0 dBm to +12 dBm.
Adjusting the input and output signal levels is done by going to the INPUT / OUTPUT menu.
