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6. Alternative Installation
Installation is done comfortably as described using the attached bracket. Alternatively it is pos-
sible to mount the AI at a different place inside the computer using the supplied nuts. This re-
quires to drill 4 holes into the housing.
RME does not accept claims for damages of any kind when installing the AI in this
way! Modifications to the housing should be done by qualified technicians only, and
only after having removed all components from the housing (danger of short circuit by
metal splinter etc).
Remove the bracket from the AI (2 screws).
1.
Carefully check that the desired location offers a flat plane, is free from any voltage carrying
2.
devices or cables, and that the AI does not get in contact with other devices even when the
housing is closed.
Please note that the lenght of the supplied cables does not allow any distance to the main
3.
card.*
Drill 4 holes, diameter 0.5" (13 mm), distance of 0.75" (19.05 mm) each, at the desired place
4.
(see drill template).
Fit the AI into the holes and fix it with the supplied nuts.
5.
*The supplied 26-pin flat ribbon cable is a common component, available in any electronics
shop. A cable of up to 1 meter length can be used without a problem.
7. Operation and Usage
Switch on the computer and boot the OS. 4 additional inputs should now be available within any
audio software.
Note: the AI carries three SMD LEDs, indicating the presence of the power supplies +5V, +12V
and –12 V.
8. Analog Inputs
The analog inputs are accessible through stereo ¼" TRS jacks.
The AI4S-192 AIO is fitted with electronically balanced, single channel inputs (+ = tip). The
servo balanced input circuit allows to use monaural TS jacks (unbalanced) with no loss in level.
When using unbalanced cables with stereo TRS jacks: be sure to connect the 'ring' contact
of the stereo TRS jack (pin 3 of a XLR jack) to ground. Otherwise noise may occur, caused
by the unconnected negative input of the balanced input.
One of the main issues when working with an AD-converter is to maintain the full dynamic
range within the best operating level. Therefore the HDSPe AIO, the HDSP 9632 and the
AI/AO4S-192 AIO use hi-quality electronic switches, which allow for a perfect adaptation of all
inputs to the three most often used studio levels.
The 'standardized' studio levels do not result in a (often desired) full scale level, but take some
additional digital headroom into consideration. The amount of headroom is different in different
standards, and again differently implemented by different manufacturers. Because of this we
decided to define the levels in a most compatible way.
User's Guide AI4S-192 AIO
5
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