Rolls

Rolls PM351 Personal Monitor Station

Overview

Please be aware that line noise may happen if there are nearby frequencies that could interfere with this equipment. To prevent this problem, please ensure that the device is correctly grounded. Alternatively, you can use a tat clip to ensure that no additional noise levels are picked up.

REMOTE POWERING THE PM351

A very useful feature of the PM351 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 technician.

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 PM351. Also, any voltage greater than 16 VDC will damage the unit.

Rolls utilizes a way of switching with a three pin jumper wire system attached to the P.C.B. It uses an external bridge clip to act as a switch for changing between two preset unit options.

• To switch between options the Bridge clip can be moved from one option/side to the other just like a switch.
• To do this simply grab the bridge clip with a pair of needle nose pliers or tweezers and pull outward from the unit disconnecting it from the pins of the unit completely.
• The middle pin is utilized in either position. In the above illustration (OFF) the middle pin is connected to the left side pin with the bridge clip to have the unit OFF.
• To select the (ON) position connect the middle pin and right pin together with the bridge clip as in the illustration below.

Please note that you must follow the silk screening of the unit to know what the jumper wire does and to which side is on or off. All of our units are different, but great care is taken to insure that the silk screening is correct.

SPECIFICATIONS

• MAX INPUT LEVEL: -20 dB XLR, +40 dB Line, +15 dB Instrument
• INPUT IMPEDANCE: 50K ohms
• OUTPUT FREQ. RESPONSE: 10 – 30 kHz +/- 3 dB Output Impedance, HDPHN: 10 ohms
• OUTPUT IMPEDANCE, INST.: 2 ea.; 100 ohms balanced
• GAIN: 20 dB 1/4″, 50 dB XLR
• HDPHN FREQ. RESPONSE: 20 – 20 kHz
• S/N RATIO: 90 dB
• POWER: 9 – 16 VDC
• SIZE (W X H X D): 5″ x 3.3″ x 1.5″
• WEIGHT: 1 lb (.45 Kg)

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 singers 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 balanced jack for connec- tion to a condenser or dynamic microphone.
• INSTRUMENT INPUT: 1/4″ TRS stereo jack for connection to an instrument or line level signal such as a guitar processor, keyboard, or instrument preamp output.
• MONO/STEREO JUMPER: 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 instrument 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.

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 selection 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 necessary.
• The INSTRUMENT INPUT connects to a guitar preamp output, key- board, or any stereo or mono instrument level signal. Again, select 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 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.

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.

GROUND LIFT

The Mic Input and Mic Thru have a ground lift jumper provided to lift the XLR pin 1 from chassis ground. The XLR Instrument Outputs also have this feature. If you experience a “hum” on the microphone or instrument outputs, lifting the ground may eliminate 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 labeled “lift”.

Frequently Asked Questions

What is a “tat clip” referred to in the product description? Can someone provide a link?****

No clue but I have never had an issue with grounding/buzz etc.

I am not getting good sound quality with this unit. No bass heard at all. Voice is too sharp (Highs EQ). Mixer’s knobs are at unity.****

I have my guitar pedal board plugged into this unit. I use $10 ear buds. I can hear our monitor mix bass and keyboard just fine. Highs are high and lows are deep.

Does the included power supply handle 220/240v or only 110v?****

The included power supply steps it down to 12 VDC. Has the ability per specs to except between 9-15VDC but certainly not 220/40.

How do I get to plug this item to my guitar amplifier if the left-out output has already been taken to my mixer? Can I use the right-out port to amp?****

I would plug the guitar to your amp. If your amp has a line out you can run this to the PM351. If it does not you can mic your amp and run that to your PM351. If you are using it as a monitor you want to hear the ‘real’ sound coming from the amp.

What about ground loops and hums? Does it manage them well?****

Never had a problem with hums or ground loops once the jumper is on its correct position.

Anyone hooked up a bass to this unit?****

I use mine primarily for electric guitar, but I ran both of my basses through it tonight for reference. I have a passive Fender bass and an 18V active Ibanez. Both sound really good through it. Just bear in mind that the PM351 simply amplifies whatever signal goes into it. Your bass will only sound as full as the signal before the monitor. As long as you are happy with the direct sound of your bass, it would be a perfect unit and functions well as a direct box. If you run an external preamp for your bass, you may want to consider running the PM351 after it, or in the effects loop of your amp. That way you are hearing your full eq’d tone.

I lost a ground/lift jumper, any idea where I could get a replacement?****

You can make your own using automotive pin terminals for ECUs and sensors.

I have this connected to aux send of my mixer, I’m not getting enough volume of the main mix (line input) how do I get more volume of the main mix?****

There is a row of aux knobs that control how much each line is put into the mix.

I’m a percussionist in a band who has a bass subwoofer separate from the mixer, with the pm351 I will be able to connect the bass subwoofer and the mi****

Probably. I have my box connected to a stage monitor for my feed.

If I have a click track coming from an iPad headphone jack, and another feed from front-of-house, can I use the instrument in for the iPad?****

Not 100% sure but I think the instrument in is mono-so you wouldn’t get stereo split of your click track-as long as that didn’t matter then it should be fine.

Does it include a limiter to protect your ears in case of feedback?****

I picked up a Rolls CL151 Comp/limiter Gate to put in front of the PS16 that distributes signal and power to the PM351’s and PM55P that my band is using just in case. It adds $100 to the overall cost but the lower noise level at practice and on stage make it all worth it.

Can a battery run it like the PM55?****

The power supply for the PM351 can deliver 15 volts DC at 0.3 Amps. On the actual unit the voltage required is noted as 9 – 15 VDC. The outside conductor on the power supply connector is positive. If you can duplicate these requirements, you could fabricate an auxiliary battery pack.

I am getting lots of ground noise from this device even though I have the grand switch on. Any advices?****

When the device is connected via the instrument connection the floating ground will cancel any noise. One must remember, this isn’t a professional piece of equipment with layers and layers of MOSFETS, JFETS AND TRANSISTORS To switch on and of the signal. So, even though there is no signal, it’s amplifying the hum from the AC transformer as well. In common terms, it needs to be connected to a device to cancel the noise. Even in the ground, or lift phase.

Will the phantom power from my mixer damage this unit? Can anyone confirm that?****

This is mentioned on the instructions that come with it, normal phantom power is 48 volts. It can damage the device. This is meant for 12 volts. Rolls has a unit that provides this. I use it all of the time and it works great.

Will the phantom power from my mixer damage this unit****

No. I use a condenser microphone with the rolls personal monitor. The mixer makes phantom power available to microphones that use it, if you are not using condenser microphones turn the phantom power off. Incorrectly wired microphones can be damaged by phantom power.

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