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Summary of Contents for ATI Technologies MLA400-800
- Page 1 MLA400-800 MMA400- LINE AND MICROPHONE AMPLIFIERS OPERATING AND MAINTENANCE MANUAL © Copyright 2008, Audio Technologies Inc. Audio Technologies Inc. ■ 856-719-9900 ■ sales@atiaudio.com ■ www. audio.com...
- Page 2 DESCRIPTION Our engineers insist on including this section in all of our instruction books. We know it is really just an excuse to blow their own horns by telling you about all the clever things they have done inside your Multiple Amplifier Array. If they have really been clever, you will never have to even think about what's inside the box and this whole section will be superfluous.
- Page 3 to 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.
- Page 4 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.
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Page 5: Installation
the rear panel jumpers. They also make convenient gain blocks and telephone line interfaces. INSTALLATION MOUNTING Your Multiple Amplifier Array is designed for rack mounting on standard E.I.A. 1-3/4 inch centers. Each unit dissipates approximately 20 watts and is ventilated through slots in the rear panel. We have absolutely no idea how many MMAs you can stack up in a rack before the solder melts, but we will be happy to sell you enough to find out. - Page 6 Audio inputs and outputs should be connected using the rear panel labels as a guide. HI outputs are all in phase with each other and are in phase with the HI inputs. Fanning strips are provided with your unit so that our ears won't start burning in the middle of the night when you try to wrap wires around those tiny barrier block screws.
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Page 7: Maintenance
ADJUSTMENTS It is sometimes difficult to maintain good noise performance when using a high output amplifier to drive medium level console inputs (-20dBm) or IHF (-10dBu, .25V) equipment inputs. You may have found it necessary in the past to insert attenuator pads to allow the amplifier to operate at a high enough level to maintain a good signal to noise ratio. - Page 8 A shaft extender kit (Model SE-8) is available to convert the screwdriver adjustments to fingertip control. This is a user installed option which requires removal of the front panel (4 screws), removal of the original screwdriver adjust shafts by pinching the rear of the shaft and pulling it out of the pot, replacement of the original shafts with the new ones and finally replacement of the panel (3 screws are enough, forget the one you dropped on the floor).
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Page 9: Specifications
SPECIFICATIONS OUTPUT LEVEL: +24dBm into 600 ohm loads. 15Vrms into high impedance loads. DISTORTION: Transformer balanced outputs, .25% maximum THD, 30 to 20,000 Hz, +22dBm. Active balanced outputs, .05% maximum THD, 20 to 20,000 Hz at +22dBm. FREQUENCY RESPONSE: +/-.25dB, 20 to 20,000 Hz -3dB at 3Hz and 40kHz typical. -
Page 10: Models Available
MODELS AVAILABLE: MLA400-1 Four Line-to-Line Amplifiers, Transformer Balanced Outputs. MLA400-2 Four Line-to-Line Amplifiers, Active Balanced Outputs. MLA800-1 Eight Line-to-Line Amplifiers, Transformer Balanced Outputs. MLA800-2 Eight Line-to-Line Amplifiers, Active Balanced Outputs. MMA400-1 Four Microphone-to-Line Amplifiers, Transformer Balanced Outputs. MMA400-2 Four Microphone-to-Line Amplifiers, Active Balanced Outputs. MMA400-1-PH15 MMA400-1 with 15 VDC Phantom Power Option MMA400-2-PH15...
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