CONNECTION
The diagram below shows an example of how to connect the PM350b for proper operation.
OPERATION
Make sure the Rolls PS27 12VDC power supply is connected to an active AC outlet, and all audio connections are in place.
• The LINE INPUT connects to either a 1/4" stereo or mono plug. If this plug is |
the STEREO setting of the Mono/Stereo jumper. If the plug is |
mono, select the MONO setting of the Mono/Stereo jumper. The MONO |
setting is also the proper selection if you are phantom powering the PM350b. |
• 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 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 micro- |
phone. |
• 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 electronically isolated and converts the |
• Setting the Mono/Stereo jumpers;
If the input to the LINE INPUT or INSTRUMENT INPUT is a
If the signal to the LINE INPUT or INSTRUMENT INPUT is
NOTE: If the LINE INPUT mono/stereo jumper is missing, only one side of the headphones/earphones will work.
LINE |
| lift gnd |
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INPUT |
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| THRU | |||
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MONO
STEREO
HEADPHONE
OUTPUTS
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 by using a 1/4" TRS to XLR cable. 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 |
connected to the PM350 IN- |
STRUMENT INPUT, pad the |
input to the mixer's mic input, or |
trim down the mic |
input. |
Connect your head- |
phones or earphones |
to the proper Head- |
phone Output. |
LINE
INPUT
lift gnd
• Phantom Powering the PM350b
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.
LINE | lift gnd | MIC |
| MIC |
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INPUT |
| THRU |
| INPUT |
| IN | mon ster | OUT | lift | gnd | OUT | |||
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mono |
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stereo |
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| PM350b MIXER PLUS |
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| 12 VDC |
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HEADPHONE |
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| MIC |
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OUTPUTS |
| LEVEL | LEVEL |
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3
NOTE: This unit cannot be powered 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