User manual RANE GE 14

[. . . ] Otherwise you might wind up hopelessly trapped in Murphy's EQ Syndrome, which roughly reads: "O. K. , we need more low end here; now add a little presence at 10k or so; hmmm, mid range is off a little, so I'll bump up 800 and 1k; now I need more punch, so up with 80, 100 and 125; darn, presence is still not there, so more of the 5k and 6. 3k, vocals seem a little buried--needs more 1. 25k and 1k. . . " and so on until all the sliders are near full boost and you have a high-dollar volume control. To avoid this, choose an area in which you know your speakers perform well, such as around 1kHz. Leave this area at roughly center position on the sliders and then compare bass, mid bass, mid highs and highs to the 1kHz area. Then if, for example, the overall sound appears to be "boomy", muddy, or lacking in midrange, turn down the mid bass and/or mid highs­­don't turn up the 1kHz midrange area instead, or you'll be headed right into the vicious circle. [. . . ] SIGNAL PRESENT Indicator: This green LED lights with any Input of -20dBu or greater. This indicator assists in signal tracing should the need arise (and it will, sooner or later, so help us Murphy). Filter Slider Controls: These 45mm sliders control the amount of boost or cut at the indicated frequency. All filters are constant-Q for constant bandwidth at any level of boost or cut, on ISO centers, and calibrated in 3dB increments on the front panel. REAR PANEL DESCRIPTION 1. INPUT Jack: This is a ¼" TRS (Tip-Ring-Sleeve) jack which automatically accommodates either balanced or unbalanced Input signals. For unbalanced operation, use a mono (single-conductor) shielded ¼" patch cord. For balanced operation, use a two-conductor shielded cable wired to a stereo TRS ¼" male plug as in Rane Note 110 (supplied with this unit). OUTPUT Jack: This is a ¼" TRS (Tip-Ring-Sleeve) jack which delivers an unbalanced Output signal. Tip is "+" or "hot", ring is signal ground, and the sleeve is not connected. To drive unbalanced equipment, use a shielded mono patch cable. GROUND LIFT Switch: This switch provides the ability to separate chassis ground and signal ground. Normally, this switch should be in the LIFT position. In some circumstances, moving it to the opposite position eliminates stubborn hum and buzz problems. If you are tempted to try moving this switch with your power amplifiers turned on and up, DON'T BE. Always turn your amplifier levels down before changing your grounds around and then bring the level up slowly. INSTALLATION STANDARD SOUND REINFORCEMENT MAIN SPEAKER EQUALIZATION 1. The GE 27 and GE 14 Inputs are automatic balanced/ unbalanced/floating and the Outputs are normal unbalanced. If the output of the mixer is unbalanced, use a shielded mono ¼" patch cord to the GE 27 or GE 14 Input(s). If the mixer is balanced, use a shielded two-conductor cable with a (TRS) ¼" plug on one end for the Equalizer and a 3-pin or (TRS) ¼" plug on the other end, whichever is required to match the mixer output jack. Wire this cable as shown in Rane Note 110 supplied with this unit. For mono operation of the main speakers with the GE 27, use a "Y" connector to drive both left and right amplifier channels from the GE 27 Output. If the Equalizer is located more than 10 feet from the amp rack, obtain a direct box or balancing line transformer to be installed at the output of the GE 14 or GE 27. Rane models FBB 44 and FLT 22 can fill this requirement. [. . . ] 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. [. . . ]