User Manual
INTRODUCTION
Thank you for your purchase of the PM351 Personal Monitor Station. The PM351 is
designed for performers who want to monitor their own sounds, such as their vocals
and instruments, with the main mix via headphones or earphones. It's very popular
with drummers who need to mix a click track with a monitor signal. Church choir sing-
ers love the PM351 to monitor their voices over the musicians.
The PM351 is shipped with an external AC adapter.
INSPECTION
1. Unpack and inspect the PM351 box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a dam-
age claim. We suggest saving the shipping carton and packing materials for safely
transporting the unit in the future.
2. Please complete the Warranty Registration Card and return it to the factory.
DESCRIPTION
LINE INPUT: 1/4" TRS stereo jack for connection to a line level source such as a
mixer monitor/auxiliary output, cassette player output, CD player output etc.
ground lift: Header jumper for disconnecting chassis ground from pin 1 of the Mic
Input and Mic Thru.
MIC THRU: XLR jack paralleled (hard-wired) to the MIC INPUT jack for pass-through
to a mixer or other micro-
phone level input device.
MIC INPUT: XLR bal-
anced jack for connec-
tion to a condenser or
dynamic microphone.
INSTRUMENT INPUT:
1/4" TRS stereo jack for
connection to an instru-
ment or line level signal
such as a guitar proces-
sor, keyboard, or instru-
ment preamp output.
MONO/STEREO JUMP-
ER: Selects whether
the INST. INPUT jack is
mono or stereo.
LEFT/RIGHT OUTPUTS:
Transformer balanced
XLR outputs from the Instrument Input.
ground lift: Header jumper for disconnecting chassis ground from the 1/4" TRS instru-
ment output jacks.
MONO/STEREO JUMPER (Located below the LINE INPUT): Selects whether the
LINE INPUT jack is mono or stereo. NOTE: When in MONO mode, the ring of the
jack may be used to "phantom power" the PM350. See the OPERATION section for
details.
DC IN 9 - 15 VDC: For connection to the external Rolls PS27 power adapter.
HEADPHONE OUTPUTS: 1/4" Stereo jack, and 1/8" stereo jack for connection to
stereo headphones or earphones.
LINE LEVEL: Adjusts the level of signal from the LINE INPUT to the headphone mix.
MIC LEVEL: Adjusts the level of signal from the MIC INPUT to the headphone mix.
INST. LEVEL: Adjusts the level of signal from the INST. INPUT to the headphone mix.
OPERATION
Make sure the enclosed Rolls PS27 12VDC power supply is
connected to an active AC outlet, and all audio connections are
in place.
• Setting the Mono/Stereo jumpers;
If the input to the LINE INPUT or INSTRUMENT INPUT is a
Tip-Ring-Sleeve stereo signal, set the Mono/Stereo jumper for
stereo operation as shown here.
If the signal to the LINE INPUT or INSTRUMENT INPUT is Tip-
Sleeve mono, move the jumper to connect the "mono" pins.
NOTE: If the LINE INPUT mono/stereo jumper is missing, only
one side of the headphones/earphones will work.
CONNECTION
The diagram below shows an example of how to connect the PM351 for proper operation.
• The LINE INPUT connects to either a 1/4" stereo or mono plug. If this plug is Tip-Ring-Sleeve
stereo and you're sending a stereo signal to this jack, select the STEREO setting of the Mono/
Stereo jumper. If the plug is Tip-Sleeve mono, select the MONO setting of the Mono/Stereo
jumper. The MONO setting is also the proper selec-
tion if you are phantom powering the PM351.
• The MIC INPUT connects to either a dynamic or
condenser microphone via a
standard XLR cable. If you are
using a condenser type mic, you
will need to power it via phan-
tom power from the mixer which
connects to the MIC THRU jack.
This jack will pass the phantom
power from a mixer on to the
microphone.
• Connect the MIC THRU jack to
the mixer or snake as neces-
sary.
• The INSTRUMENT INPUT
connects to a guitar preamp output, key-
board, or any stereo or mono instrument
level signal. Again, selecte stereo or mono.
• The INSTRUMENT OUTPUTs are
transformer isolated and converts the high
impedance INSTRUMENT INPUT signal to low impedance so it can be sent down a balanced
line. These signals may then be plugged into an XLR input on a mixer or snake. Note that the
level of this signal may be too high for a mixer's microphone input - you may experience distor-
tion. In this event, turn down the instrument connected to the PM351 INSTRUMENT INPUT,
pad the input to the mixer's mic input, or trim down the mic input.
Connect your headphones or earphones to the proper Headphone Output.
GROUND LIFT
The Mic Input and Mic Thru have a ground lift jumper provided to lift the XLR pin 1 from chas-
sis ground. The XLR Instrument Outputs also have this feature. If you experience a "hum" on
the microphone or instrument outputs, lifting the ground may elliminate the problem. To lift the
ground, use a pair of needle-nose pliers and carefully remove the header jumper. Replace the
jumper on the two pins labled "lift".