OPERATORS MANUAL SM 82 STEREO MIXER 1 10 5 0 POWER 2 6 8 3 6 8 4 6 8 5 6 8 6 6 8 7 6 8 8 6 8 RETURN 6 8 OUTPUT L 4 2 0 6 8 L C R 2 4 10 5 0 L C R 2 4 10 5 0 L C R 2 4 10 5 0 L C R 2 4 10 5 0 L C R 2 4 10 5 0 L C R 2 4 10 5 0 L C R 2 4 10 5 0 L C R 2 4 L C R BAL 4 2 0 OL 6 8 C R BAL SM 82 STEREO MIXER 0 OL 10 0 OL 10 0 OL 10 0 OL 10 0 OL 10 0 OL 10 0 OL 10 0 OL 10 10 10 OL SEND BAL LEVEL SEND BAL LEVEL SEND BAL LEVEL SEND BAL LEVEL SEND BAL LEVEL SEND BAL LEVEL SEND BAL LEVEL SEND BAL LEVEL LEVEL LEVEL QUICK START No one likes to read manuals. Everyone likes to just start pushing buttons and turning knobs until the desired results magically emerge. That's usually OK, and with a very few exceptions, damage is unlikely to result from such procedures with the SM 82. This product is quite obvious: Input LEVEL controls make Inputs louder or not, the stereo SENDs make things happen at the LOOP SEND outputs, and so on. No real magic there. You should be aware, however, that if you want to connect a mono source to the SM 82, use only the LEFT Input of a channel so that the mono source will drive both the Left and the Right channels. Set the levels of the mixer so that the red lights stay off. If they come on, you are overdoing it and distortion will result. Never connect anything except an RS 1 or other approved Rane AC power supply to the thing that looks like a telephone jack on the rear of the SM 82. This is an AC input and requires some 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 on page Manual-3.. SM 82 CONNECTION When connecting the SM 82 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 and ears. INPUTS The SM 82's Inputs are unbalanced. This means that standard ¼" connectors on the ends of any good quality cable will work well between your signal sources, signal processing and amplification. For best rejection of nasty things like hum and RF, keep input cables under 10 feet (3 meters) in length. Most sources give you the choice of stereo or mono output. The mixer gives you the same choice. You will note that nomenclature has been placed beneath the input jacks indicating which is RIGHT and which is LEFT (MONO). If a source is plugged only into the Left jack and not into the Right, both Right and Left channels will be fed with the Left Input. This allows the use of either stereo or mono sources. OUTPUTS The SM 82 offers balanced main outputs only. This means that you may use them as either balanced or unbalanced, the choice being made by the way the connectors are wired. It's a good idea to always use a TRS or stereo connector in the outputs no matter which mode you are using. If a "mono" connector is used, inserting it into the output will short the ring (­) to ground and could conceivably cause a small amount of distortion to be placed on the tip (+). While this is not destructive, it may be significant enough to be audible. Balancing therefore requires WEAR PARTS: This product contains no wear parts. that both tip (+) and ring (­) be wired to the following device. Unbalanced requires only tip and sleeve connected, leaving the unused ring open. EFFECTS DEVICES External devices which might be used could be either mono in and out, while some may be mono in and stereo out, while still others may be stereo on both ends. The SM 82 easily accommodates all of these varieties. If your effect is mono on both ends, connect its input to the SM 82 LEFT LOOP SEND and the effect's output to the SM 82 LEFT LOOP RETURN. This configuration will sum Right and Left Loop Outputs to the mono effect input and will sum the mono effect output to the Left and Right Input buses. A mono-in stereo-out device would connect to the loop outputs in the same way; however the stereo outputs connect to the respective LEFT and RIGHT LOOP RETURNS. EXPANDING Connecting two or more SM 82s together to achieve more than eight stereo Inputs requires that a stereo cable (tip, ring, sleeve) be connected between the MAIN EXPAND OUTPUT of the first mixer and the MAIN EXPAND INPUT of the second. All 32 inputs will then appear at the main OUTPUT of mixer number two. Only the first sixteen Inputs will be available at the main Outputs of mixer number one. Should you wish to have all Loop buses tied, connect the LOOP SENDS of mixer one to the LOOP EXPAND INPUT of mixer two. All sixteen stereo sends will then become active at the LOOP SENDS of the second mixer. Manual-1 FRONT PANEL DESCRIPTION 5 10 5 0 POWER SEND L C R BAL 2 0 OL LEVEL 10 0 SEND R BAL 2 1 4 6 8 10 5 L C 2 0 OL LEVEL 10 0 SEND R BAL 4 6 2 6 8 10 5 L C 2 0 OL LEVEL 10 0 SEND R BAL 4 9 OUTPUT L 8 C R BAL 2 0 OL LEVEL 10 4 6 8 3 6 8 10 5 L C 2 0 4 4 6 8 10 OL LEVEL 0 SEND R BAL 10 5 L C 2 0 4 5 6 8 10 OL LEVEL 0 SEND R BAL 10 5 L C 2 0 4 6 6 8 10 OL LEVEL 0 SEND R BAL 10 5 L C 2 0 4 7 6 8 10 OL LEVEL 0 SEND R BAL 10 5 L C 2 0 4 8 6 8 10 OL LEVEL R BAL L C RETURN 4 2 0 OL LEVEL 10 6 SM 82 STEREO MIXER 1 4 3 8 7 11 10 1 POWER switch: Depress the upper portion of this switch to turn the unit on (with power supply plugged in); depress the lower portion to turn the unit off. Depressing the center portion of the switch causes acute indecision stress to the switch's personality profile, which in turn depresses it. To alleviate this condition, the switch must be "turned on", so to speak. 2 Input LEVEL control: is a rotary stereo attenuator that adjusts the amount of both Left and Right signals applied to the Input. Its output is routed to the main summing amplifier for mixing with all other Inputs. The unity gain position of this control is located at "7.5." 3 Input OVERLOAD indicator: glows red whenever the Input's output exceeds a level 4 dB below clipping, letting you know it's a good idea to turn this Input down a bit. 4 Input BALANCE control: In its center detent, Left and Right signals to each channel are allowed to pass at their original relative levels, therefore preserving the stereo image from instrument connected to the Inputs. When the control is moved vertically toward the "L" position, the Right channel level is decreased while the Left channel level is maintained. The opposite occurs if the control is moved from the detent down toward the "R". When a mono input is used (no plug in the RIGHT Input jack), the BAL control becomes a PAN control, panning the mono signal from the Left to Right channels. 5 Input SEND Level control: determines the amount of Post-Fade stereo input is fed to the auxiliary buses. Each Input's stereo SEND is summed on this bus and is available at the respective LEFT and RIGHT LOOP SENDS on the rear of the mixer. 6 RETURN LEVEL control: is a rotary stereo attenuator that controls the amount of Return which is to be added to the Main Output. The unity gain position of this control is located at "7.5." 7 RETURN OVERLOAD indicator: glows red whenever the return levels exceed a level of 4 dB below clipping. 8 RETURN BALANCE control: is a vertical slider that controls the effect or source connected to the LOOP RETURN in the same way the Input BALANCE controls work (see 4 above). 9 OUTPUT LEVEL control: is a rotary stereo attenuator that controls the final signal Level at the main OUTPUT jacks. The unity gain position of this control is located at "7.5". 0 OUTPUT OVERLOAD indicator: glows red any time the output level exceeds 4 dB below clipping. q OUTPUT BALANCE control: is a vertical slider that operates in the same fashion as the BALANCE control described in item 4 above. It however, determines the relative levels of the LEFT and RIGHT main OUTPUTS only. Manual-2 REAR PANEL DESCRIPTION 9 OUTPUT BALANCED MAIN EXPAND OUTPUT LOOP RETURN UNBALANCED LOOP SEND UNBALANCED 8 7 6 5 4 3 2 1 MAIN EXPAND INPUT LOOP EXPAND INPUT POWER LEFT RIGHT ACN 001 345 482 SM 82 TIP=L RING=R LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT LEFT (MONO) RIGHT TIP=L RING=R 300mA CLASS 2 EQUIPMENT RANE CORP. MADE IN U.S.A. ALL INPUTS ARE UNBALANCED 1 2 3 4 5 67 8 1 Main OUTPUT: These balanced Tip-Ring-Sleeve jacks are used to connect the main Outputs of the SM 82 to a power amplifier or to additional signal processing. As is the standard with all Rane balanced outputs using ¼" TRS jacks, the Tip is (+), the Ring is (­) and the Sleeve is ground. 2 MAIN EXPAND OUTPUT: This ¼" TRS stereo (Tip = left, Ring = right) Output jack connects one SM 82 to another for the purpose of expanding the number of Inputs available in the system. Only a stereo plug and cord should be used. To do otherwise will cause loss of Right channel signal and possibly distortion to the Left channel. This Output also serves as a fixed pre-fader level useful as tape outputs or other applications. 3 LOOP RETURN: These ¼" aux returns may connect the output of a reverb or other effect unit to the Loop bus of the SM 82. If no effect is used, they can be used as a ninth stereo Input to the mixer in addition to those described in 5. As with the other stereo Inputs, mono signal may be connected to the LEFT input to obtain two channel mono operation. 4 LOOP SEND: This pair of ¼" jacks may drive an effect or similar device which is to be returned to item 3 above. If a mono device is used, both the Left and Right Send channels of the SM 82 are summed together and presented at the LEFT Output if nothing is inserted in the RIGHT Output. 5 Channel Input jacks: consist of Eight pairs of unbalanced ¼" tip-sleeve jacks, used to connect any line-level signal source to the SM 82. As indicated, only the LEFT is to be used if the Input is mono and should therefore appear in both Left and Right channels, depending on the position of the front panel BALANCE control which is now effectively a PAN. 6 MAIN EXPAND INPUT: A ¼" TRS stereo Input jack may link two or more SM 82s together. The Left input is on the Tip, Right on the Ring and the Sleeve is ground. This may also be used to sum any fixed-level stereo signal into the Main Outputs, producing a tenth stereo Input when added with 5 and 3. As in 2 above, use only a stereo TRS cable. 7 LOOP EXPAND INPUT: Another ¼" TRS stereo Input, expands the stereo Loop buses of two SM 82s similar to the MAIN EXPAND OUTPUT in 2. A stereo Tip-Ring-Sleeve cable must be used for this application. Connect the LEFT and RIGHT LOOP SENDS (4) of the first unit to the LOOP EXPAND IN of the second unit. (Tip = left; Ring = right.) 8 Remote POWER supply input: Use only an RS 1 or other remote AC power supply approved by Rane. The SM 82 is supplied from the factory with a remote power supply suitable for connection to this input jack. The power requirements of the SM 82 call for an 18-24 volt AC center-tapped transformer only. It is not a telephone jack. Using any other type of supply may damage the mixer and will void the warranty (which at two years parts and labor is worth safeguarding). 9 Chassis ground point: A #6-32 screw is provided for chassis grounding purposes. See the note below for details. 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 is to discover how your particular system wants to be grounded. Here are some things to try: 1. Try combinations of lifting grounds on units that are supplied with ground lift switches or links. 2. If your equipment is in a rack, verify that all chassis are tied to a good earth ground, either through the line cord grounding pin or the rack screws to another grounded chassis. 3. Units with outboard power supplies, such as the SM 82, do not ground the chassis through the line cord. Make sure that these units are grounded either to -another chassis which is earth grounded, or directly to the grounding screw on an AC outlet cover by means of a wire connected to a screw on the chassis with a star washer to guarantee proper contact. Please refer to the RaneNote, "Sound System Interconnection" (supplied in this manual and available separately) for further information on system grounding. Manual-3 OPERATING INSTRUCTIONS CIRCUIT DESCRIPTION Learning to operate the SM 82 might be a bit easier if you glance at the Block Diagram below. All eight stereo Inputs operate in exactly the same way. Signal applied to the Inputs is acted on by a radio interference filter (we have assumed that local broadcasts should not be a part of your music) and is then routed to a stereo LEVEL control. If you are using a mono source, connect it only to the LEFT Input to se ...