Kramer SPK-C411 User manual

KRAMER ELECTRONICS LTD.
USER MANUAL
MODELS:
SPK-C411
Closed-back Ceiling Speakers
SPK-C412
Closed-back Ceiling Speakers
P/N: 2900-300188 Rev 1

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SPK-C411 / SPK-C412 – Contents i
Contents
1Introduction 1
2Getting Started 2
2.1 Achieving the Best Performance 2
3Overview 3
4Your Closed-back Ceiling Speakers 4
5Installing the Closed-back Ceiling Speakers 6
5.1 Choosing the Best Location 6
5.2 Cutting the Ceiling Tile 6
5.3 Mounting the SPK-C411 / SPK-C412 Speakers 7
5.4 Painting the Speaker 10
6Technical Specifications 11
Figures
Figure 1: SPK-C411 / SPK-C412 Closed-back Ceiling Speakers in a Boardroom Setup 3
Figure 2: SPK-C411/ SPK-C412 Closed-back Ceiling Speaker 4
Figure 3: Closed-back Ceiling Speaker Schematic Diagram 5
Figure 4: Mounting the SPK-C411 / SPK-C412 Closed-back Ceiling Speakers 7
Figure 5: Plugging and Securing the Cable 8
Figure 6: Tighten the Mounting Tabs 9
Figure 7: Adjust Tap Selector (for SPK-C411 and SPK-C412, Respectively) 9

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SPK-C411 / SPK-C412 - Introduction 1
1
1 Introduction
Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been
providing a world of unique, creative, and affordable solutions to the vast range of
problems that confront video, audio, presentation, and broadcasting professionals
on a daily basis. In recent years, we have redesigned and upgraded most of our
line, making the best even better!
Our 1,000-plus different models now appear in 11 groups that are clearly defined
by function: GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Routers;
GROUP 3: Control Systems; GROUP 4: Format/Standards Converters; GROUP 5:
Range Extenders and Repeaters; GROUP 6: Specialty AV Products; GROUP 7:
Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9:
Room Connectivity; GROUP 10: Accessories and Rack Adapters and GROUP 11:
Sierra Products.
Congratulations on purchasing your Kramer SPK-C411 and SPK-C412
Closed-back Ceiling Speakers, which are ideal for the following typical
applications:
•Boardrooms •Presentation venues
•Conference rooms •Training rooms
•Educational classrooms •Hotel lobbies
The package includes the following items:
•A pair of SPK-C411 and/or SPK-C412 speakers
•Mounting kit
•This user manual
SPK-C411 and SPK-C412 are designed for indoor dry locations
and are suitable for use in air handling spaces (plenum spaces).
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2 SPK-C411 / SPK-C412 - Getting Started
2 Getting Started
We recommend that you:
•Unpack the equipment carefully and save the original box and packaging
materials for possible future shipment
•Review the contents of this user manual
•Use Kramer high-performance high-resolution cables
Go to http://www.kramerelectronics.com to check for up-to-date
user manuals, application programs, and to check if firmware
upgrades are available (where appropriate).
2.1 Achieving the Best Performance
To achieve the best performance:
•Use only good quality connection cables (such as the Kramer BC-2S) to
avoid interference, deterioration in signal quality due to poor matching, and
elevated noise levels (often associated with low quality cables)
•Do not secure the cables in tight bundles or roll the slack into tight coils
•Avoid interference from neighboring electrical appliances that may adversely
influence signal quality
•Position your Kramer SPK-C411 / SPK-C412 away from moisture,
excessive sunlight and dust
To ensure that you obtain the best sound results, do not open the
housing of the passive speaker or the active speaker.
UL2043 – Fire Test for Heat and Visible Smoke Release for
Discrete Products and their Accessories Installed in Air-Handling
Spaces.
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SPK-C411 / SPK-C412 - Overview 3
3
3 Overview
The SPK-C411 / SPK-C412 Closed-back Ceiling speakers consist of a pair of high
performance closed back speakers. The pair can be mounted on the ceiling, as
well as via a ceiling mounting kit used to safely secure the speakers to the ceiling.
The speakers are defined in the following table:
Name Diameter [ " ] Impedance [
Ω
] Closed-back Depth [ " ]
SPK-C411 4 4 4
SPK-C412 4 8 4
Figure 1shows an example of how the SPK-C411 / SPK-C412 Closed-back
Ceiling speakers can be installed in a boardroom setup:
Figure 1: SPK-C411 / SPK-C412 Closed-back Ceiling Speakers in a Boardroom Setup

4 SPK-C411 / SPK-C412 - Your Closed-back Ceiling Speakers
4 Your Closed-back Ceiling Speakers
Figure 2defines the SPK-C411 / SPK-C412.
Figure 2: SPK-C411/ SPK-C412 Closed-back Ceiling Speaker
The following table defines the Closed-back Ceiling speaker hardware items (per
speaker pair) for each model in the series:
Description
A pair of
ceiling
speakers
(one shown)
Two grilles
(one shown)
Cutout
template
This table defines the ceiling mounting kit items:
Four
support
ring
screws
Two ceiling
support rings
(C-ring) – one
shown
Two pairs of
tile rails –
one of a pair
shown

SPK-C411 / SPK-C412 - Your Closed-back Ceiling Speakers 5
5
Each Closed-back Ceiling speaker is supported by a C-ring and two tile rails. The tile
rails prevent the speakers from falling if the tile itself comes out or falls apart, as
their ends catch onto the T-grid. When mounting onto the ceiling tiles, use both
supports. When mounting onto a sheetrock ceiling, the C-ring alone is used to
reinforce the ceiling material.
Be sure that the tiles can support the speaker. Smaller sized tiles or
fiberglass-type tiles cannot support the weight of the speakers.
When this is the case, the speakers will need additional support.
Figure 3shows a schematic diagram of the Closed-back Ceiling speaker:
Figure 3: Closed-back Ceiling Speaker Schematic Diagram
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6 SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers
5 Installing the Closed-back Ceiling Speakers
This section explains how to install the SPK-C411 / SPK-C412 closed-back ceiling
speakers, that is:
•Choosing the best place to locate your speakers (see Section 5.1)
•Cutting the ceiling tile (see Section 5.2)
•Mounting the Speakers (see Section 5.3)
•Painting the speakers (see Section 5.4)
5.1 Choosing the Best Location
Ideally, locate the speakers above the main listening area. Before doing so, be
sure that:
•The desired location is free of obstructions, such as electrical piping, AC
ducts or water lines, and so on
•There is enough space behind the mounting surface for the speakers
•The rear side of the speaker is not blocked by wall studs or other objects
5.2 Cutting the Ceiling Tile
To cut the ceiling tile, do the following:
1. Remove the circle in the supplied template.
Keep this template for later use as a mask, as you may want to paint the speakers (see
Section 5.4)
2. Mark the opening in the correct location by tracing the hole in the template.
3. Cut out the hole according to the template or with a circular cutter set to the
appropriate cutout size.
Initially, you can cut a smaller area inside the marked hole just to be sure that the
space above the speakers is clear
4. Route the wiring from the amplifier to the speakers’ cutout holes, taking care
not to place them next to electrical wires or at least at a distance of about
two feet from an AC line.