Rane FDA 28 - Manual (Page 2)

FRONT PANEL DESCRIPTION
The FDA 28 is a combined Stereo or Mono unit. Outputs are labelled in white,
1A/B - 4A/B for STEREO use, and in gray, 1-8 for MONO operation. Note that in
MONO the odd Output Channels are connected to INPUT A and the even Output
Channels to INPUT B.
1. INPUT GAIN CONTROLS. These concentric controls set the Gain of each Input
to be routed to the A and B bus for Stereo operation, or to the odd and even buses
for Mono use. The inner knob controls the level to be sent to bus A (odd), the outer
knob controls the signal applied to bus B (even). Rotating the knobs upward
together from the MIN position creates a “pan centered” effect. Leaving one off and
increasing the other emulates a full pan to one bus or the other.
2. A AND B OVERLOAD INDICATORS. These red LEDs illuminate whenever the
combination of Input level and Input GAIN adjustment cause the input amplifiers to
reach or exceed a level equal to 4dB below clipping.
3. MASTER A AND B LEVEL CONTROLS. These concentric controls set the level
to each of the post buses. Output levels may be selected via the four pairs of
controls connected to the Output sections if the internal PRE/POST switches are in
the POST position (as shipped).
In the PRE position, the MASTER Level control is bypassed for that respective
Output and only the Input GAIN Control and the OUTPUT Level Control have any
effect on an individual Output.
4. STEREO/MONO SWITCHES. To make one or both Inputs drive all eight
Outputs, slide all switches to their MONO positions. In STEREO mode, INPUT A
drives bus A (or odd) only; INPUT B connects to bus B (or even) only. Program
each pair of Outputs as necessary. Monoing one Output pair will have no effect on
the other Outputs.
5. OUTPUT LEVEL CONTROLS. Each pair of OUTPUT controls sets the indi-
vidual Channel Output levels. The inner knob is for Channel A (or odd), the outer is
Channel B (or even).
6. POWER INDICATOR. When this yellow LED is illuminated, the foregoing
information should be correct. If darkness is present at this location, most or all of
the above will be inoperative.