Samson CM11B Bedienungsanleitung
AUDIO
CM11B
CM11B
CM11B
SURFACE MOUNT OMNIDIRECTIONAL
BOUNDARY MICROPHONE
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Copyright 2005, Samson Technologies Corp.
Printed Jan. 2005
Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 9031
Syosset, NY 11791-9031
Phone: 1-800-3-SAMSON (1-800-372-6766)
Fax: 516-364-3888
www.samsontech.com
Table Of Contents
Introduction 2
CM11B Features 3
Using the CM11B 4-5
Powering the CM11B 4
Microphone Placement and Positioning
4
-
5
CM11B Polar Pattern 6
CM11B Installation 7
CM11B Frequency Response 8
CM11B Specifications 9
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2
Introduction
Thank you for purchasing the CM11B boundary microphone from Samson Audio! The CM11B is a low profile, sur-
face-mount boundary microphone ideal for flat surfaces like conference room tables, alters or hanging on walls.
The minimally intrusive design allows that microphone to be used in applications where low visibility is desired. The
CM11B features a permanently charged condenser element with a half-omnidirectional pickup pattern. Because the
CM11B is omni-directional, it provides linear pick-up in a 360-degree pattern, allowing the unit to be placed on the
center of a conference table to pick-up everyone seated. Although the CM11B is very small in size, all the electron-
ics are contained within the body, eliminating the need for any external electronics pack. The CM11B is fitted with
a standard 3-pin miniature male XLR connector, and a 30-foot mini XLR to standard XLR cable is included. The
CM11B operates on standard 9 through 52 Volt phantom power. A heavy Neoprene rubber pad is added to the bot-
tom of the unit to decouple the microphone from the surface helping reduce unwanted pick-up noise. The CM11B is
built using heavy-duty die cast construction with reinforced steel grill screen. Convenient mounting holes and hard-
ware for hanging on walls or ceilings is included. A low reflectance, matte black finish enhances the stylish minimalist
look.
Should your CM11B Boundry Microphone ever require servicing, a Return Authorization number (RA) must be
obtained before shipping your unit to Samson. Without this number, the unit will not be accepted. Please call
Samson at 1-800-3SAMSON (1-800-372-6766) for a Return Authorization number prior to shipping your unit. Please
retain the original packing material and, if possible, return the CM11B in its original carton and packing materials.
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3
CM11B Features
The Samson CM11B utilizes state-of-the-art microphone technology and is engineered to the finest detail. Here
are some of its main features:
• Half-omnidirectional - Condenser
• Low-profile with onboard electronics and no external power supply
• Mini XLR connector
• Includes 30-foot cable with mini to standard XLR connectors
• Standard 9 – 52 Volt Phantom Power Operation
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Powering the CM11B
The CM11B is a condenser microphone and therefore it needs to be operated by connecting a phantom
power supply. The CM11B operates on any phantom supply which provides 9 through 52 volts. Phantom
power is standard on most quality mixers. If necessary, an external phantom supply,
like the Samson
S phantom,
can also be used. The CM11B receives the phantom power directly from a mic connector or
cable when connected to a mixer that includes a phantom supply. The power is sent OUT of the microphone
INPUT, riding silently along with the audio signal. Most mixers have a switch to engage the phantom power,
so be sure to check that the phantom power is on.
Microphone Placement and Positioning
The CM11B was designed primarily for use on a flat surface like a conference table, hanging on a wall, or in
a house of worship, on the alter. In order to maximize the sound quality, you must pay careful attention to the
placement of your CM11B and how it is positioned for the instrument or vocalist that you are miking. Since the
CM11B is a omnidirectional the microphone will pick-up the sound in a 360 degree pattern, essentially picking
up in every direction. This is often a good solution in a conference situation since the CM11B will pick up all
Using the CM11B
4
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Microphone Placement and Positioning - continued
around the table. All microphones, especially uni-directional or cardioid microphones, exhibit a phenomenon
known as “proximity effect.” Very simply put, proximity effect is a resulting change in the frequency response of
a microphone based on the position of the mic capsule relative to the sound source. Generally, you will get a
bass boost when miking in close. When you point a cardioid mic directly at the sound source (on axis) you will
get the best frequency response, however when you start pointing the microphone slightly away (off axis) you
will notice the low frequency response dropping off and the microphone will start to sound thinner. However,
since the CM11B is omni directional it exhibits very little proximity effect.
Using the CM11B
5
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CM11B Polar Pattern
6
Every microphone has a characteristic polar pattern that determines how well it accepts or rejects signal com-
ing from various areas around the microphone. For example, unidirectional, or cardioid, mics are specifically
designed to accept mostly signal coming from directly in front, and to reject signal coming from behind or from
the side. In contrast, omnidirectional mics accept all signals regardless of where those signals originate (in
front of the mic, behind it, to the side, etc.). The pickup pattern utilized by the CM11B is omnidirectional (as
shown in the illustration below).
For this reason, the CM11B excels in environments where capturing the sound
from all directions around the microphone is desired. The CM11B will pick up
the sound in a 360-degree pattern, which makes it ideal for placing in the center
of a conference table to record a meeting. The polar pattern also determines
how prone a particular mic is to inducing feedback. Feedback is that charac-
teristic nasty howling sound that occurs when a mic is placed too close to a
loudspeaker—the signal from the loudspeaker is fed into the mic, then into the
loudspeaker, then into the mic, over and over again until an oscillating tone
is generated. Because the CM11B is omnidirectional, special attention to the
microphone and speaker placement should be considered in live sound applica-
tions.
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CM11B Installation
The CM11B can be installed on just about any flat surface. Simply place the unit on a conference table, alter
or sound stage. For mounting flush to a wall or ceiling, you can use the mounting holes provided on the rear
of the microphone. Take care not to cover the any part of the mic element with your hand or any other object.
Also, be aware of a phenomenon called the proximity effect, as explained on page 4, which causes a notice-
able change in the frequencies response of the microphone.
7
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8
CM11B Frequency Response
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