Line-Level Devices (Synthesizers, Cd Players, Video) - Alesis Studio 12R Reference Manual

Line-level devices (synthesizers, CD players,
video)
The Studio 12R features line-level inputs on 1/4" phone jacks which accept standard
unbalanced or balanced signals.
Unbalanced Line Input
Signal
Ground
Tip
Sleeve
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 any of the Studio 12R's [LINE
IN] jacks, with the [TRIM] level set at approximately the 1 o'clock position. Plug stereo
sources such as synthesizers, CD players, and drum machine main outputs into the
STEREO LINE channels (9/10 and 11/12) if possible.
Electric guitars and basses may be plugged directly into the [LINE IN] jacks, if you
raise the [TRIM] level. The Studio 12R has more than enough gain (up to 50 dB when the
channel fader and trim are set to maximum) for guitars, although some pickups may sound
better if they're plugged directly into a high-impedance preamp designed for guitar use.
Plug the output of such preamps into any [LINE IN] jack.
A reminder: do not plug a line input and a microphone input into the same
channel. The inputs are not designed to handle two sources at the same time. If you
crank up the line level input to extremes to compensate for the level loss, you may damage
the microphone.
Studio 12R Reference manual
Balanced Line Input
Tip Hot
Cold
Sleeve Ground
Tip
Ring
Connections
Tip
Ring
Sleeve
Sleeve
12