Audio Technologies Inc. | 154 Cooper Road #902 | West Berlin, NJ 08091 | Voice 856-719-9900 | Fax 856-719-9903 | www.
audio.com
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 in phase with the HI inputs.
CAUTION
Your Distribution Amplifier has active drivers for both HI and LO output terminals.
DO NOT GROUND either HI or LO terminals. If you are driving a single ended
(unbalanced - one side grounded) high impedance or 600ohm load, it should be
connected between either HI to GND or LO to GND. If you are driving a balanced
load, connect it between HI and LO output terminals. It is generally unnecessary
to terminate the DA with a 600ohm load if it is driving a high impedance input
although placing a terminating resistor across a HI-Z input at the receiving end
will occasionally reduce RF pickup.
ADJUSTMENTS
It is sometimes difficult to maintain good noise performance when using a DA to
drive medium level console (-20dBm) or IHF (.1V) equipment inputs. You may
have found it necessary in the past to insert attenuator networks between a DA
and medium level console inputs to allow the DA to operate at a high enough
output level to maintain a good signal to noise ratio. Your DA will reduce its
already low output noise still further as you turn down its' gain. In the absence of
high RF fields, you can distribute input signals as low as -20dBm to multiple
loads at 0 to -20dBm levels.
MAINTENANCE
Power supply voltages are + and - 15VDC nominal.
IC output DC Voltages under no signal; shorted input conditions should remain
within .1V of ground. Greater deviation is an indication of IC or circuit problems.
MODIFICATIONS
230 VAC OPERATIONS
Your DA is wired for 115 VAC, 50/60Hz operation unless otherwise requested at
the time ordering. It can be modified for 230 VAC operations by removing the
power transformer primary jumpers J3 and J5 and inserting a jumper in J4.
Different types of attachment plug or line cords may be required for connection to
alternate supply voltages.
