Rolls PM351 owner manual Connection, Operation, Ground Lift

CONNECTION

The diagram below shows an example of how to connect the PM351 for proper op- eration.

OPERATION

Make sure the Rolls PS27 12VDC power supply is connected to an active AC outlet, and all audio connections are in place.

UT connects to either a 1/4" lug. If this plug is Tip-Ring- d you're sending a stereo , 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

XLR cable. If you are using

• 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.

LINE	lift gnd	MIC
INPUT		THRU

MONO

STEREO

HEADPHONE

OUTPUTS

ser type mic, you will need

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.

LINE

INPUT

lift gnd

•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
MIC	MIC	INST	SURE HOW TO DO THIS
THRU	INPUT	INPU	CORRECTLY, CONTACT A

QUALIFIED SERVICE TECH-

NICIAN.

3

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	4
jumper on the two pins labled "lift".