PreSonus PRM1 User Manual

PRM1

RTA Measurement
Microphone

Owner’s Manual

Introduction

Thank you for purchasing the PreSonus® PRM1

RTA Microphone. This omnidirectional microphone
has been designed to provide an accurate
reproduction of a room’s sound characteristics for
use with audio-analysis tools, such as real-time
analyzers and spectrographs. Delivering a flat
frequency response from 20 Hz to 20 kHz and
featuring a ¼”, pre-polarized, electret condenser
capsule, the PRM1 is an excellent companion
to the Virtual StudioLive™ Smaart® System
Check Wizards and other analysis systems.

We appreciate the support you have shown
us through the purchase of this product.

Features

• ¼”, pre-polarized, electret condenser capsule

• Flat frequency response from 20 Hz to 20 kHz

• Low noise, low distortion

• Ideally suited for system analysis
and measurement

• All-metal chassis

Precautions

• Mute audio system output prior to
connecting or disconnecting the PRM1 or
engaging/disengaging phantom power.

• When operating in outdoor
environments, cover capsule with foam
windscreen to reduce wind noise.

• Attach to a mic stand when analyzing sound
systems to ensure accurate measurements.

About This Microphone

The PRM1 is a condenser microphone with a
flat frequency response and an omnidirectional
polar pattern. Let’s briefly define these terms.

Condenser Microphones

Condenser microphones such as the PRM1
require a power source, which can be provided
by an external power supply or using phantom
power, which is usually provided by a mixer,
preamplifier, or direct box. Phantom power is
sent over the same mic cable that carries the
audio signal; the term derives from the fact
that there is no visible power cable, and the
voltage is not perceptible in the audio path.

PreSonus StudioLive-series mixers provide
phantom power to every mic input,
including the talkback input utilized by the
Smaart System Check Wizards in VSL.

Flat Frequency Response

A microphone with a flat frequency response
captures all frequencies equally within its
specified response range, neither boosting
nor cutting frequencies, so it accurately
reproduces the incoming signal. While this
makes it ideal for measuring what a room or
speaker is doing to the outgoing signal in a
sound system, it is not necessarily the best
choice for recording specific instruments.

Omnidirectional

The PRM1 has an omnidirectional polar
pattern, meaning it is equally sensitive in all
directions. This allows the microphone to
measure reflections, as well as direct signals,
providing an accurate depiction of the room.

12.7 mm
[0.5”]

192 mm

[7.56”]

7257 Florida Boulevard • Baton Rouge,
Louisiana 70806 USA • 1-225-216-7887

www.presonus.com

What’s in the Box

• PRM1 RTA Microphone

• PRM1 Hard Case

• PRM1 Shock Mount

• PRM1 Foam Windscreen

21 mm
[0.83”]

®

© 2012 PreSonus Audio Electronics, Inc. All Rights Reserved. PreSonus and StudioLive are
trademarks or registered trademarks of PreSonus Audio Electronics, Inc. Smaart is a registered
trademark of Rational Acoustics, Inc. Other product names mentioned herein may be
trademarks of their respective companies. All specifications subject to change without notice.

Part# 820-PRM0022-B

Dimensions

19 mm
[0.75”]

Mic Position and Room Analysis

Improper mic placement when analyzing a sound
system can result in the system appearing to
have problems that don’t actually exist. Below
is a quick reference for proper mic placement.

Primary Mic Position

This is the main reference point for a speaker and
can be used as a single, “representative” position.
Your goal in setting the primary mic position
is to find a point that puts the microphone in
the center (on axis) of a speaker’s throw, within
the listening area. In other words, you want to
put the microphone smack dab in the middle
of where your speaker sounds its best.

Secondary Mic Position

Secondary mic positions provide your system
analysis with more information to get a more
“three-dimensional” view of your system.
These can be on- or off-axis measurements
of a speaker within the listening area. Avoid
using locations outside the core coverage
area of your system, or on the edges.

With any mic position, avoid creating
position-dependent anomalies.

X

2

2

2

2

2

2

2

1

2

2

2

Ground Bounce

Ground reflections, or “ground bounce,” become an
issue when a speaker is flown and angled down.
The proper mic position, in this case, will also
catch the reflection of the signal off the floor.

Reflection
arrives

~4ms late...

In this case, you can choose from three options:

• Block the reflection with a baffle.

• Do a ground-plane measurement.

• Do a multi-point measurement to
randomize the effect of the floor bounce.

Technical Specifications

Type Black electret condenser

Element Pressure, FET preamplifier

Polar Pattern Omnidirectional

Frequency Response 20 Hz to 20 kHz

Sensitivity (@ 1 kHz open-circuit voltage) -37 dB/Pa (14 mV/Pa)

1 Pa=94 dB SPL

Rated Impedance 200Ω

Minimum Load Impedance 1,000Ω

EIN (A-weighted) 26 dB

Max. SPL (1 kΩ load) 132 dB SPL (THD ≤ 1%, 1 kHz)

Dynamic Range (1 kΩ load) 106 dB

S/N Ratio 70 dB

Power 9-52V Phantom

Current Consumption 2 mA

Polarity Pin 2 output positive

voltage (relative to Pin 3)
when diaphragm receives
positive pressure (moves inward)

Connector 3 pin XLR Male

Finish Metal, matte black

Environmental Conditions 10-50˚ C, humidity 0-95%

Weight 150g (5.3 oz)

Dimensions (LxW) 7.56” x 0.83” (192 mm x 21 mm)

EU Directives on the Protection of the Environment

RoHS This product is compliant with the EU Directive 2011/65/EU for the Restriction

of the use of Certain Hazardous Substances in Electrical and Electronic Equipment. No
lead (Pb), cadmium (Cd), mercury (Hg), hexavalent chromium (Cr+6), PBB or PBDE
is intentionally added to this device. Any traces of impurities of these substances
contained in the parts are below the RoHS specified threshold levels.

REACh This product is compliant with the European Union Directive EC1907/206 for the
Registration, Evaluation, Authorization, and Restriction of chemicals (REACh) and contains none
or less than 0.1% of the chemicals listed as hazardous chemicals in the REACh regulation.

WEEE This symbol on the product or its packaging indicates that this product must
not be disposed of with other waste. Instead, it is your responsibility to dispose of your
waste equipment by handing it over to a designated collection point for the recycling
of waste electrical and electronic equipment. The separate collection and recycling
of your waste equipment at the time of disposal will help conserve natural resources
and ensure that it is recycled in a manner that protects human health and the environment.
For more information about where you can drop off your waste equipment for recycling, please
contact your local city recycling office or the dealer from whom you purchased the product.

PreSonus Limited Warranty

1. PreSonus Audio Electronics Inc. warrants this product to be
free of defects in material and workmanship for a period
of one year from the date of original retail purchase.

2. This warranty is enforceable only by the original retail purchaser.
To be protected by this warranty, the purchaser should register the
product on line at www.presonus.com within 14 days of purchase.

3. For warranty information in all other countries except
the USA, please refer to your local distributor.

4. During the warranty period PreSonus shall, at its sole and
absolute option, either repair or replace, free of charge,
PRM1 headphones that prove to be defective on inspection
by PreSonus or its authorized service representative.

5. A warranty claim is deemed valid if:

a. Purchase of the product took place within the last

12 months (or extended period if required by law)
and purchased legitimately through a dealer.

b. The failure description and/or the visual appearance

do not indicate physical abuse by the customer and
the factory-applied serial number has not been altered
or removed or tampered with in any way.

6. The Limited Warranty does not cover :

a. Improper handling or neglect
b. Products returned without proof of purchase
c. Products where serial number, ID numbers

or logos have been tampered with

d. Products that have been modified from original design.
e. Damages incurred in transit, where the carrier

needs to be notified to handle the claim

f. Damages incurred by unauthorized repairs
g. Physical abuse
h. Natural disasters such as fire, flood, lightning, earthquake
i. Liquid contamination
j. Excessive high or low temperature or humidity
k. Inappropriate storage
l. Physically damaged connectors
m. Connection or operation of the unit in any way that

does not comply with the technical or safety regulations
applicable in the country where the product is used

n. Damages/defects caused by force majeure or any other condition

that is beyond the control of PreSonus Audio Electronics

7. To obtain warranty service, the purchaser must first call or write
PreSonus at the address and telephone number printed ON
THE FRONT OF THIS MANUAL to obtain a Return Authorization
Number and instructions of where to return the unit for service. All
inquiries must be accompanied by a description of the problem.

8. All authorized returns must be sent to the PreSonus repair facility
postage prepaid, insured and properly packaged. PreSonus
reserves the right to update any unit returned for repair.

9. PreSonus reserves the right to change or improve the design of
the product at any time without prior notice. This warranty does
not cover claims for damage due to abuse, neglect, alteration,
or attempted repair by unauthorized personnel and is limited
to failures arising during normal use that are due to defects in
material or workmanship in the product. Any implied warranties,
including implied warranties of merchantability and fitness for
a particular purpose, are limited in duration to the length of this
limited warranty. Some states do not allow limitations on how
long an implied warranty lasts, so the above limitation may not
apply to you. In no event will PreSonus be liable for incidental,
consequential, or other damages resulting from the breach of
any express or implied warranty, including, among other things,
damage to property, damage based on inconvenience or on loss of
use of the product, and, to the extent permitted by law, damages for
personal injury. Some states do not allow the exclusion of limitation
of incidental or consequential damages, so the above limitation
or exclusion may not apply to you. This warranty gives you specific
legal rights, and you may also have other rights, which vary from
state to state. This warranty only applies to products sold and used
in the United States of America. For warranty information in all
other countries except the USA, please refer to your local distributor.