User manual RANE FDA 28

[. . . ] This is an AC input and requires special attention if you do not have a power supply EXACTLY like the one that was originally packed with your unit. See the full explanation of the power supply requirements elsewhere in this manual. FDA 28 DISTRIBUTION AMPLIFIER SYSTEM CONNECTION When connecting the FDA 28 to other components in your system for the first time, leave the power supply for last. This gives you a chance to make mistakes and correct them without damage to your fragile speakers, ears and nerves. This wire should always be two-conductor plus shield, even for unbalanced operation. [. . . ] 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. Each pair of OUTPUT controls sets the individual Channel Output levels. The inner knob is for Channel A (or odd), the outer is Channel B (or even). 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. REAR PANEL DESCRIPTION The FDA 28 uses Euroblocks that disconnect and accommodate any wire size from 26AWG to 12AWG. Use these for either Microphone or Line level INPUTs to be distributed by the FDA 28. Connect balanced sources to the respective "+"and "­" terminals, and choose a shield grounding terminal (either signal ground (SIG GND) or chassis ground). When using an unbalanced Input you may leave "­" open, or short it to GND. In the out position, the respective Input stage is set for Microphone Input levels. In the on position, 15VDC PHANTOM POWER appears present on each INPUT, and the LED lights. Connect two conductor shielded cable to "+"and "­" terminals. This switch provides the ability to separate chassis ground and signal ground. In some circumstances it may be necessary to move it to the opposite position to eliminate stubborn hum and buzz problems. If you are tempted to try moving this switch with your power amplifiers turned on or turned up, don't be. Always turn your amplifier levels down before changing your grounds around and then bring them up slowly. USE ONLY A MODEL RS 1, FRS 8, RAP 10, VC 18 OR OTHER REMOTE AC POWER SUPPLY APPROVED BY RANE. The FDA 28 is supplied with a remote power supply suitable for connection to this input jack. See the CHASSIS GROUNDING note on the last page for details. INTERNAL ASSIGN SWITCHES SHIPPED IN "POST" POSITIONS. OPERATING INSTRUCTIONS This module serves two similar yet different functions. In `all STEREO' mode, it will split two Inputs into four pairs of Outputs. The two Inputs may be set at different levels if necessary via the concentric MASTER level controls. All eight Outputs (4 pairs) may be set as necessary through the use of the four sets of concentric OUTPUT level controls. [. . . ] The unit is shipped with this switch in the "grounded" position, tying circuit ground to chassis ground. If after hooking up your system it exhibits excessive hum or buzzing, there is an incompatibility in the grounding configuration between units somewhere. Your mission, should you accept it, is to discover how your particular system wants to be grounded. Try combinations of lifting grounds on units that are supplied with ground lift switches or links. [. . . ]