LA12 OPERATORS MANUAL
CAUTION - MAINS FUSE
The Drawmer LA12 is a low noise, low crosstalk distribution amplifier. The unit provides one stereo input with master 'gain' and 'balance' controls and twelve stereo outputs, each with individual output level control. It may be used to distribute one stereo signal to up to twelve different outputs. A typical application example would be for real time cassette duplication, but it may be used for a variety of other applications, such as the distribution of one stereo signal to other rooms/areas within a complex e.g. discotheques, shopping malls etc.
A maximum gain of +20dB is available through the unit, which allows a wide range of 'source' and 'destination' equipment to be interfaced.
An auxiliary stereo output which follows the input gain and balance controls can be linked to the input of a second LA12 if further stereo outputs are required. OPERATION
The LA12 has been designed for ease of use. It operates on input levels in the range -10dB to +10dB. The signal source should be connected to the rear panel sockets marked INPUT' Left and Right , and the OUTPUT' sockets should be similarly connected to their appropriate destinations. Each of the front panel controls adjust both Left and Right channels.
INPUT: The Input Level is determined by rotation of the 'Gain' control. 'Balance' control adjusts the stereo balance between Left and Right channels.
OUTPUT: The 'Output' controls, numbered 1 to 12, adjust the level at the corresponding output phono connector pair on the rear panel.
AUXILIARY OUTPUT: This output phono connector pair can be used to link to another LA12. The level of the output is determined by "input" level and balance controls.
All audio connections are on professional quality phono (RCA jack) connectors, with white for Left and red for Right channels. lf earth loop problems are encountered, do not disconnect the mains earth but instead, try disconnecting the co-axial screen connections to the inputs or outputs of the unit. LA12 TECHNICAL SPECIFICATIONS
INPUT IMPEDANCE 22K Ohm
INPUT GAIN Max+10dB
OUTPUT GAIN -40dB to +10dB
NOISE Better than-100dB
(ref +4dBv, Gain=0dB, @ 22Hz - 22KHz)
CROSSTALK -67dB @ 10KHz
(Input grounded, any channel output)
DISTORTION 0.008% @ 100Hz
0.015% @ 1KHz to 10KHz
BANDWIDTH 5Hz to 25Khz -1dB
POWER REQUIREMENTS 115Volt or 230Volt at 50-60Hz, 7 Watts
FUSE RATING 32mA for 230Volt, 63mA for 115Volt
CONFORMING TO BS EN 60127-2:1991 SHEET III
FUSE TYPE 20mm x 5mm, Class 3 Slo-Blo, 250Volt Working
CASE SIZE 482mm (w) x 44mm (h) x 200mm (d)
WEIGHT (incl packaging) 3.4 Kgs