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INST.
INPUT
MIC
INPUT
MIC
THRU
LINE
INPUT
lift
gnd
OPERATION
Make sure the 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 con-
nect the "mono" pins.
NOTE: If the LINE INPUT mono/stereo jumper is
missing, only one side of the headphones/earphones
will work.
• Phantom Powering the PM351
A very useful feature of the
PM350b is the ability to send the 12VDC power to the
unit via the LINE INPUT ring connection. Make sure the
Mono/Stereo jumper is in the MONO position. Connect
the 12VDC to the Ring of the TRS plug as shown here.
ROLLS WILL NOT BE HELD RESPONSIBLE FOR
DAMAGE DONE TO THE PM350 AS A RESULT OF
IMPROPER USE OF THIS
FEATURE. IF YOU ARE NOT
SURE HOW TO DO THIS
CORRECTLY, CONTACT A
QUALIFIED SERVICE TECH-
NICIAN.
NOTE: This unit cannot be pow-
ered by standard 48 Volt Phantom Power supplied by mixers, phantom power
adapters etc. The current (amperes) is insufficient to power the PM350b. Also,
any voltage greater than 16 VDC will damage the unit.
GROUND LIFT
The Mic Input and Mic Thru have a ground lift jumper provided to lift the XLR
pin 1 from chassis ground. The 1/4" TRS 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".
MIC
THR
U
LIN
E
INPU
T
HEADPHONE
OUTPUT
S
MONO
STEREO
lift
gnd
3
4
CONNECTION
The diagram below shows an example of how to connect the PM351 for proper op-
eration.
• The LINE INPUT connects to either a 1/4"
• The LINE INPUT connects to either a 1/4"
stereo or mono plug. If this plug is Tip-Ring-
stereo or mono plug. If this plug is Tip-Ring-
Sleeve stereo and you're sending a stereo
Sleeve stereo and you're sending a stereo
signal to this jack, select the STEREO setting
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 selection if you
are phantom powering the
PM351.
• The MIC INPUT con-
nects to either a dynamic or
condenser microphone via a
standard XLR cable. If you are using
standard XLR cable. If you are using
a condenser type mic, you will need
a condenser type mic, you will need
to power it via phantom power from
to power it via phantom 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 necessary.
• The INSTRUMENT INPUT connects to a guitar preamp output, keyboard, 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 distortion. In this event, turn down the instrument con-
nected 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.