ATI Audio DDA224-BNC Operating And Maintenance Manual - Page 5
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INSTALLATION:
LOCATION
To avoid addition of jitter (timing variations) to the digital bitstream, which could
cause noise and distortion in the recovered audio, avoid locating the DDA in
close proximity to a high energy, high frequency switching type power supply or a
power amplifier that utilizes a switching supply. If possible, do not power both
devices from the same AC power line.
Expensive components start to die at internal temperatures above 70°C (158°F).
We recommend that you maintain rack temperatures below 50°C (122°F) to
prevent excessive internal temperature buildup. This is another good reason not
to mount the DDA directly above that 500W power amplifier. Don't force the DDA
to support the weight of 28 coax cables (especially when you drop that 500W
power amplifier on the cable bundle); support the cables.
POWER
If it is necessary to convert a unit wired for 115VAC to 230VAC operation, unplug
the unit from the power source, remove the four cover mounting screws and
locate the E1 jumpers next to the power transformer. Clip the jumpers 1-2 and
3-4 (don't unsolder), jumper from 2-3, carefully soldering together the free ends
of 2-3 previously clipped. This procedure is recommended to avoid soldering
damage to the multi-layer PC board.
WIRING
BNC connections require 75-ohm coax (RG59). Select a cable for losses less
than 20dB at 12MHz (for data rates up to 96kHz) at the maximum distance you
require. Runs up to 1000 meters should be readily achievable with low loss coax.
INPUT CABLE EQUALIZATION
If there is an unusually long (more than a few hundred feet) cable connection
between a particular AES/EBU data source and the DDA, it may be necessary to
equalize the cable response. Equalization would be indicated if it is not possible
to lock onto a known good signal source and obtain a stable reading of the DDA
input sample rate as evidenced by the front panel indicators.
1. Apply a known good AES/EBU digital signal at the source maximum sample
rate of 96, 88.2, 48, 44.1, or 32 kHz to the source end of the cable. (You can
validate the source by temporarily co-locating the DDA with the signal source,
ATI Audio Inc.
■ Tel: 856-626-3480
■
Fax: 856-504-0220
■
www.
audio.com