ATI Audio DA208 - Manual (Page 3)

ATI Audio Inc. ■ Tel: 856- 719-9900 ■ Fax: 856-504-0220 ■ [email protected] ■ www. audio.com
Your DA operates from a bipolar 15VDC regulated supply. The power supply is designed
for minimum susceptibility to power line transients and conducted RFI using ferrite
beads, double capacitive bypasses and a non-concentric wound semi-toroidal power
transformer.
INSTALLATION
MOUNTING
Your ENCORE SERIES DA is designed for rack mounting on standard E.I.A. 1-3/4 inch
centers. Each unit dissipates approximately 10 watts and is ventilated through slots in the
rear panel.
WIRING
There are three wire grounded plugs. The power line ground could cause a loop with your
studio ground. If you are sure your studio ground will provide adequate protection to
personnel in case of an AC line short to chassis, a 3-to-2 AC adapter can be used to
isolate the power line ground. We recommend that the adapter be removed and the power
line ground be reconnected prior to any service work requiring removal of the studio
ground from the chassis.
To allow maximum flexibility in grounding in high RF environments, the DA circuit
grounds are isolated from case ground. For normal operation, add a ground jumper from
any Phoenix connector ground terminal to the chassis ground screw.
The four inch silver bearing low inductance copper strap which you are, of course, using
for your studio ground is not going to fit around the #6 chassis ground screw on the
amplifier rear panel. Run the strap to within a few inches of the chassis and jump to the
chassis ground screw with shield braid.
We have taken serious measures to keep RF out of your DA. This includes split and
bypassed input and output resistor networks, beaded, bypassed and isolated power inputs,
non-concentric wound power transformers and double ground plane PC boards.
However, in a difficult broadcast application, any RF shielding and suppression system is
going to be no better than the ground system into which it is trying to dump the unwanted
RF. For optimal product performance, be sure to have a good facility grounding system.
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.