Owners Manual

3
CONNECTIONS
The Preamp Phono/Line In connections are RCA-type jacks and are used to connect your turntable,
tape, CD, MP3 player, or other analog stereo audio device to the USB Phono Plus
Project Series
.
The Ground terminal connection on the rear is used to connect the separate ground wire from your
turntable to reduce hum. (This connection is unnecessary for digital output turntables).
The Preamp Line Out connections are RCA-type jacks that are always connected to the analog input
preamp signal for source monitoring or to allow use as a stand-alone phono preamp.
The S/PDIF In To USB RCA-type connection is a digital input that overrides the Opto In and analog
preamp signal connections whenever there is a valid digital signal present that is in S/PDIF format.
This digital signal input is routed to the your computer USB interface for S/PDIF to USB connectivity
only. Note: You cannot connect S/PDIF to analog or analog to S/PDIF with this product.
The OPTO In To USB and OPTO Out From USB connections provide for Optical digital connections
direct to your computer via USB. When there is valid TOSLINK digital signal at the OPTO In connec-
tion it overrides the analog preamp signal connection to the USB interface.
The 1/8-inch Headphone Monitor Output jack on the front is stereo unbalanced and can accommo-
date a wide variety of headphone models. Maximum output level is +6dBu (1.4Vrms).
The USB bus from your computer normally powers the USB Phono Plus
Project Series
. A power
connector on the rear allows you to use an optional external power source to reduce the power drawn
from your computer. The USB Phono Plus
Project Series
operates from any external power
source that provides 150mA or more @ 7 Volts to 12 Volts DC (either polarity at the tip will work with
our unit) or 9 Volts to 12 Volts AC.
The USB To Computer connector is USB 2.0 compliant and should be used to connect directly to
one of the USB connections on your computer. This connection also powers the USB circuitry inside
the USB Phono Plus
Project Series
and will power the whole product if no other power source is
available. This connection looks like a standard “USB Audio CODEC” to your computer, and your
computer then controls the sample rate.