ATI Technologies MLA400-800 Manual de funcionamiento y mantenimiento - Página 3
Navegue en línea o descargue pdf Manual de funcionamiento y mantenimiento para Amplificador ATI Technologies MLA400-800. ATI Technologies MLA400-800 10 páginas. Line and microphone amplifiers
Imprimir páginato console medium level inputs (-20dBm) or to drive IHF inputs (single ended at
.10Vrms) without requiring outboard attenuator pads.
A summing junction, isolated from the adjustable gain stage output by a
1K ohm build out resistor, is brought out to the rear connector to allow channel
inputs to be added together and single inputs to drive multiple outputs. Any
channel may be interconnected with any or all other channels. Unused inputs
should have their pots turned to off (full CCW). Each summed channel is
attenuated in proportion to the number of connected channels, e.g. 2 ch = 6dB,
3ch 10dB, 4ch = 12dB, 8ch = 18dB.
The summing junction is also the input terminal of the channel's output
line driver. The output stage is a balanced driver, which is either transformer or
resistively coupled to the output line. Each channel is programmable for different
output stage gains with a jumper plug connector. The basic stage gain is 6dB
with the plug in the center position; additional gain of 10 or 20dB is selected by
moving the plug. Units are generally shipped set up for +10dB (16dB total stage
gain).
Transformer coupled outputs (-1 models) are recommended when driving
long lines since the low source impedance will minimize high frequency roll off
due to cable capacity and the total primary to secondary isolation prevents AC
power line ground system voltage differentials from adding in with the audio at
the receiving end. Transformer outputs are also best for driving both balanced
and unbalanced lines. The output transformer is a low leakage reactance design
and it is loaded with an RC network to maintain smooth high frequency response
and excellent square wave performance whether it is resistively terminated with
600 ohms or left unloaded.
Active balanced outputs (-2 models) are more economical and are
preferred for short cable runs driving known loads. Avoid driving an active output
into a device with a single ended, unbalanced, one side grounded input since this
condition effectively shorts out the amplifier driving the low output. These inputs,
of which lHF phono jacks are typical, can be driven from an active balanced
output by connecting the load between a HI output terminal and a GND (rather
than HI and LO terminals). Each active output is isolated from the output
terminals by DC blocking capacitors and 150 ohms of build-out resistance. The
build-out resistors are split and bypassed to prevent any RF signals that might be
picked up on an output line from feeding back into the amplifier.
The Multiple Amplifier Arrays operate from an internal bipolar 15VDC
regulated supply. The power supply is designed for minimum susceptibility to
power line transients and conducted RFI using ferrite beads, double capacitive
bypasses and a non-concentric wound semi-toroidal power transformer with a
mu-metal shield.
Audio Technologies Inc.
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856-719-9900
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www.
audio.com