User manual TASCAM LA-81MKII
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Manual abstract: user guide TASCAM LA-81MKII
Detailed instructions for use are in the User's Guide.
[. . . ] These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. CAUTION Changes or modifications to this equipment not expressly approved by TEAC CORPORATION for compliance could void the user's authority to operate this equipment.
CE Marking Information a) Applicable electromagnetic environment: E4 b) Peak inrush current: 4. 2 A
In North America use only on 120V supply.
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IMPORTANT SAFETY INSTRUCTIONS
1 Read these instructions. [. . . ] 10 3ADA Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Example 1 (LA-80MKII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Example 2 (LA-80MKII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Example 1 (LA-81MKII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Example 2 (LA-81MKII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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1Introduction
Thank you very much for purchasing a TASCAM LA-80/81MKII. Please read this Owner's Manual carefully and understand how to operate the device correctly before use. We hope that you will fully use the features of this unit for many years to come. After reading this manual, please keep it in a convenient place for future reference.
Overview
The LA-80MKII has 8 internal circuits to convert unbalanced inputs to balanced outputs. In addition, the Audio Distributed Amplifier (ADA) function allows single inputs to be assigned to multiple outputs using the INPUT LINK switches between each channel. The LA-81MKII has 8 internal circuits to convert balanced inputs to unbalanced outputs. for the entire unit · Each channel has an INPUT/OUTPUT LEVEL switch that allows input and output levels to be switched between -20 dBu and +4 dBu · Level indicator LEDs that show signal presence · Semi-fixed TRIM controls for fine level adjustment of ±12 dB · Rack mount brackets · Three-prong AC power outlet (Not on EUR model)
· GND LIFT switches to turn the ground ON and OFF for each balanced connector · ALL LIFT switch that turns the ground ON and OFF
Supplied accessories
The following items are included with this product. · Main unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 · Power cord set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 · Rack mount screw set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 · Owner's Manual (this document) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 · Warranty card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Contact your TASCAM supplier if any of these items are missing.
Precautions for placement and use
· Use this unit within its operating temperature range of 540º C (40104º F). In addition, please avoid placement in locations that are very dusty or humid because this could cause malfunction. This could cause damage to the internal circuitry or the case.
NOTE
Please be aware that, as a result of improvements or other changes to the product, photographs, illustrations and other depictions in the Owner's Manual may differ from the actual product.
Cleaning the unit
Use a soft cloth to wipe the unit clean. Do not clean it with chemical-based wipes, benzene, thinner, alcohol or similar substances. This could damage the surface or cause the color to change.
Rack-mounting the unit
Use the supplied rack-mounting kit to mount the unit in a standard 19-inch rack, as shown below. Remove the feet of the unit before mounting.
NOTE
· Leave 1U of space above the unit for ventilation. [. . . ] 2 LED indicators Indicate the presence of input signals.
3 TRIM (BALANCED TO UNBALANCED) 18 These semi-fixed trim controls allow output signal levels to be adjusted in a range of ±12 dB.
Rear panel (LA-81MKII)
4 OUTPUTS 18 RCA pin jack type output connectors with nominal output levels of -10 dBV (0. 3 V). This setting can be made for each channel independently.
e INPUT LINK switches 28 These switches allow an input signal to be routed to any higher numbered output. Two or more inputs can also be assigned to multiple outputs in sequence (see "3ADA Functions" for examples. )
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2Names and Functions of Parts
Block diagram (LA-80MKII)
UNBALANCED TO BALANCED
XLR OUT
RCA JACK
2
- 4
3 2 - 4
8
3
AMP with TRIM function
1
LEVEL SHIFT
OUTPUT LEVEL -20dBu
BALANCED AMP
NC3FAH1 J702 1 2 1
AGND RCA JACK
8
INPUT LINK
VR1 +4dBu -20dBu
5 6 R729 47k -
7
S705
S702
+4dBu GND LIFT AGND SW
3 GND LIFT SGND
AGND AGND AGND
Level diagram (LA-80MKII)
UNBALANCED TO BALANCED
LEVEL +15dB +10dB +5dB 0dB -5dB -10dB -15dB -20dB -25dB -20dBu -10dBV -9dBV (-26. 2dB) -7dBu -9dBu +4dBV (-2. 2dB) +4dBu +17dBV +17dBu
0dBu=0. 775V
-30dB -35dB -40dB -45dB -50dB
0dBV=1V
-33dBu
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2Names and Functions of Parts
Block diagram (LA-81MKII)
BALANCED TO UNBALANCED
XLR IN BALANCED AMP with TRIM function +
- 4 1
NC3FAH1 J102 1
3
BALANCED INPUT CIRCUIT
2
3 2
8
GAIN SWITCH AMP U805B
5 6-
+
7 +4dBu
RCA JACK
VR GND LIFT
SW -20dBu AGND
LIFT AGND
SW GND
AGND
Level diagram (LA-81MKII)
BALANCED TO UNBALANCED
LEVEL +15dB +10dB +5dB 0dB -5dB -10dB -15dB -20dB -25dB -30dB -35dB -40dB -45dB -50dB -31. 8dBu -20dBu +21. 9dBu (-7. 1dB) -29dBu -16dBu -18dBu (+24dB) +4dBu +2. 1dBu (-7. 1dB) -5dBu (-2. 8dB) -10dBV
0dBu=0. 775V 0dBV=1V
+8dBu
-42dBu
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3ADA Functions
LA-80MKII ADA Functions
By using the LA-80MKII INPUT LINK switches e, the signals input from single connectors can be routed to other channels and output as desired.
Example 1 (LA-80MKII)
In this example, the signal input through channel 1 is routed to channels 18.
1 Input a signal through the (unbalanced) INPUT 1 4. 3 The signal input through channel 1 is output through (balanced) OUTPUTS 18 5.
Example 2 (LA-80MKII)
In this example, a stereo pair of signals input through channels 1 and 5 are output in parallel to 4 channels each.
1 Connect the left stereo signal to the (unbalanced) INPUT 1 4 and connect the right stereo signal to the (unbalanced) INPUT 5 4.
Input signal (L) 1
2 Turn INPUT LINK switches 24 and 68 e ON. [. . . ]
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