ALESIS M1 Active Mk2 - Manual (Page 25)

Speaker Installation
M1 Active Mk2 Reference Manual
27
P OWER SWITCH
The POWER switch is located on the back panel. A blue power indicator
lamp is on the front panel.
I NPUT C ONNECTIONS
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.
Tip
Sleeve
Signal
Ground
Tip
Sleeve
Unbalanced Line Input
Tip
Sleeve
Hot
Ground
Tip
Sleeve
Balanced Line Input
Ring
Ring
Cold
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.