Alesis M1Active MKII User Manual - Page 25
Polarity, Direct connection of unbalanced -10 dBV line level sources
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Speaker Installation POWER SWITCH The POWER switch is located on the back panel. A blue power indicator lamp is on the front panel. INPUT CONNECTIONS Almost any conventional line-level source may be plugged into the M1 Active Mk2's LINE INPUT jack. The Line Input jack accepts both XLR and 1/4" input plugs wired either balanced or single-ended (unbalanced). The best connection is to use a high-quality XLR-to-XLR "mic cable" between the output of the source (usually, the CONTROL ROOM OUTPUT of the console) and the speakers. A conventional 1/4" "patch cord" mono TS-type plug will also work for unbalanced sources which automatically ground the minus input. Polarity: Input connector wiring is printed to the left of the connector on the back panel and is as follows: + Pin 2: tip ("hot") - Pin 3: ring ("cold") Shield Pin 1: sleeve (ground) A positive voltage on the "hot" connector will cause the drivers to move outwards. Unbalanced Line Input Balanced Line Input Signal Ground Tip Sleeve Hot Cold Ground Tip Ring Sleeve Tip Sleeve Tip Ring Sleeve Direct connection of unbalanced -10 dBV line level sources: Most synthesizers, drum machines, effect devices, cassette decks and CD players operate at this level. Their average signal level is about 1/3 of a volt. They have a 2-conductor output jack that is either a 1/4" phone or "RCA phono" type. These may be plugged directly into the M1 Active Mk2's LINE IN jacks. M1 Active Mk2 Reference Manual 27