User manual RANE SM 26B

[. . . ] Set the individual CHANNEL LEVEL controls for proper output level. The MASTER INPUT LEVEL control on the front adjusts both Right and Left Input signal levels together. Never connect anthing except an RS 1 or other approved Rane AC power supply to the red thing that looks like a telephone jack on the rear of the SM 26B. [. . . ] MONO INPUT LEVEL controls the Level of signal through each particular channel. When fed from the MONO IN jack, each stage has a gain range from Off to +12 dB minimum, allowing level matching of -10 dBV equipment to +4 dBu gear. When fed via the LEFT & RIGHT INPUT(s), these CHANNEL LEVEL controls automatically limit to a maximum of unity gain to accommodate the +12dB available from the Left & Right Input gain stages. MIX/PAN serves two different functions: MIX: When used as a SPLITTER, this controls the mix of Left and Right Master Input program to each Channel's MONO OUTPUT. PAN: When used as a MIXER, this control pans the Mono Channel Input between the LEFT and RIGHT MIX OUTPUTS. MASTER INPUT LEVEL sets the gain of the Left & Right Master Input stages, with a range of Off to +12 dB. In the splitting mode, this controls the Level of all Mono Channel Outputs at once (i. e. , those which do not have a separate input). Manual-2 REAR PANEL DESCRIPTION LEFT & RIGHT MASTER INPUTS are balanced Tip-Ring-Sleeve (TRS) ¼" Inputs. These Inputs feed all six MONO OUTs when all MONO INs are not used. Connecting to individual MONO INs disconnects that channel from these Inputs (refer to the Block Diagram found on the SM 26B Data Sheet). For unbalanced operation use a standard mono ¼" plug; for balanced operation use a TRS (stereo) ¼" plug wired as follows: TIP is signal + (connect to Pin 2 on a 3-pin connector). RING is signal - (pin 3 in a 3-pin connector). LEFT & RIGHT EXPAND OUTPUTS: ¼" TRS jacks that are connected in parallel with the Master LEFT & RIGHT INPUT jacks, allowing two or more SM 26Bs to be daisychained for multiple splitting. Simply connect these EXPAND OUTPUTS to the LEFT & RIGHT INPUTs of another SM 26B; there is no limit to the number of expansions possible with the SM 26B. NOTE: These Expand Outputs are not buffered from the Master Inputs. Therefore it is not possible to mix both balanced and unbalanced lines in the same channel between several units: once the ring and sleeve are shorted anywhere in the chain (by using a mono plug) the entire line becomes unbalanced. MONO INPUTS are TRS ¼" jacks which accept either balanced or unbalanced mono signals. [. . . ] Using any other type of supply may damage the mixer and void the warranty. IMPORTANT NOTE CHASSIS GROUNDING 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. [. . . ]