User manual RANE FPE 13

[. . . ] Never connect anything except AN APPROVED RANE POWER SUPPLY TO THE THING THAT LOOKS LIKE A TELEPHONE JACK ON THE REAR OF THE FPE 13. This is an AC input and requires special attention if you do not have an operational 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. FPE 13 PARAMETRIC EQUALIZER SYSTEM CONNECTION When connecting the FPE 13 to other components in your system for the first time, leave the power supply for last. This will give you a chance to make mistakes and correct them before any damage is done to your fragile speakers, ears and nerves. [. . . ] It is calibrated from 100 to 2k, and its exact frequency is determined by the range switch described in (4), above. This rotary control determines the amount of boost or cut applied to the FPE's passband by its filters. The center detent, cleverly placed at the center of rotation of this control, provides a ground for the filter which completely eliminates the filter's influence over FPE 13 operation. Rotating this knob clockwise increases the gain at the center frequency of the filter, CCW from center decreases the gain at said center frequency. Calibrated from . 03 octaves to 2. 0 octaves, this rotary control adjusts the "width" of coverage of each filter. Bandwidths this narrow are normally reserved for notch feedback control. Higher settings yield smoother curves and are convenient for program sweetening and acoustic compensation. This yellow LED illuminates any time power is supplied to the FPE 13 from a Rane RS 1 or VC 18 single power supply, RAP 10 or FRS 8 multiple power supply. Other power sources could conceivably cause illumination of the LED and several ICs and resistors inside. REAR PANEL DESCRIPTION 1. This ¼" TRS connector parallels the 3-pin connector described in item 1. The +, ­ , and COMMON GND terminals parallel the respective pins in the 3-pin and ¼" connectors. This ¼" TRS connector parallels the 3-pin connector exposed in item 5 below. Active balanced outputs operated in the unbalanced mode use only pin 2 driving the line and pin 1 acting as the return. Grounding pin 3 will not cause any damage nor will it impair the sound. It only creates extra work for your audio electrons and is unnecessary. This ¼" TRS jack provides an unbalanced I (Input) on its tip and an unbalanced O (Output) on its ring. Designed for use with tip=send/ring=return effect loop inserts found on many mixing consoles. This provides an easy means for patching the unit into effect loops as painlessly as possible, using a single ¼" TRS stereo patch cable. CAUTION: Use either the PATCH I/O or any of the INPUT and OUTPUT connectors--Do not use both at the same time. This switch provides the ability to separate chassis ground and signal ground. In some circumstances, moving it to the opposite position eliminates stubborn hum and buzz problems. We realize a scientific explanation would be helpful, unfortunately science doesn't have enough to do with it. [. . . ] With the range switches you may position all three bands of the equalizer to overlap to remove any acoustic resonances causing you grief. As luck would have it, the top few nodes are usually grouped in such a way that you can't get them all with a conventional parametric. With the FPE 13's overlapping bands, you never have this problem. A good way to find them is to set the bandwidth for about 1/2-octave, the LEVEL control to full cut, then sweep around with the FREQuency knob until you find the first culprit. [. . . ]