ATI Technologies MMA400-800 Betriebs- und Wartungshandbuch - Seite 4

Blättern Sie online oder laden Sie pdf Betriebs- und Wartungshandbuch für Verstärken ATI Technologies MMA400-800 herunter. ATI Technologies MMA400-800 10 Seiten. Line and microphone amplifiers

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APPLICATIONS
The Multiple Amplifier Arrays provide you with four or eight high gain
channels (MMA400, MMA800) or four or eight lower gain channels (MLA400,
IVILA800).
The high gain channels of the MMA are ideal for general microphone to
line amplification and for use as program amplifiers operating from low
impedance, low level console buss levels. A single microphone may be
paralleled into several inputs to make a mike distribution amplifier that can be set
up to drive each output at a different level, each output having its own
independent gain control. Since each input has 20,000-ohm balanced input
impedance, even paralleling one microphone into all eight inputs will not cause
any noticeable loading of the microphone.
A single input channel with its single gain control may feed multiple
outputs by jumping channels together at the summing points available on the
rear connector. All outputs are then adjusted by the single gain control and may
either be set all to the same level or offset in ten dB steps (with the output gain
jumper plugs P1 through N) to drive outputs at approximately -10dBv, 0dBm and
+10dBm for use in a press box application. Unused inputs should have their gain
pots turned off at full CCW rotation to avoid excess noise.
Multiple inputs may be summed to multiple outputs by interconnecting the
rear connector jumpers. You can make an effective and simple mike mixer this
way for pre-set installations such as conference rooms that don't require
continuous adjustment.
Any high gain input of the MMA400 and MMA800 may be converted to
accept line level inputs up to +22dBu by clipping wire PC board jumpers J3, J6,
J9, or J12 to change channels 1, 2, 3 or 4 respectively. This will allow balanced
high level sources and unbalanced IHF sources at -10dBv to be mixed with
mikes or other low level sources.
The Line Input MLA400 and MLA800, with up to 46dB gain available, are
ideal for building up IHF phono plug outputs (-10dBu, high Z) to balanced 600
ohm levels. With four or eight channels available, they are a natural fit for
interfacing small recording consoles into balanced systems. The high impedance
balanced inputs will not load down an IHF output and will provide good
cancellation of any common mode hum that is picked up by the input wiring.
MLAs will also interface from balanced 600 ohm lines to unbalanced, one side
grounded, IHF inputs by connecting the center conductor to the high (or low) side
of the active balanced output with the shield tied to ground.
MLAs are useful for making stereo L+R summing networks, mixing
systems and various types of distribution systems by combining channels with
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