Phonograph Turntables; Do Not Connect Any Of The Following To Any Input Of The Studio 12R - Alesis Studio 12R Reference Manual

Phonograph turntables

If you're using a record turntable, you may not plug it directly into the line inputs of the
Studio 12R (well, you can, but it will sound very thin and noisy). Obtain a phono preamp
from your dealer or an electronics specialty store.
1. Plug the outputs of the phonograph pickup into the RIAA-
equalized phono preamp.
2. Plug the outputs of the preamp into the LINE IN 9-10 or 11-12
inputs of the Studio 12R.
Do not connect any of the following to any
input of the Studio 12R!
The speaker output of any power amplifier.
Any source that is too loud for the input (no more than 3 volts
RMS into a [MIC] jack or 13 volts RMS into a [LINE IN] jack).
Any unshielded cable.
Studio 12R Reference manual
Connections
15