Kramer SPK-C612 User manual

KRAMER ELECTRONICS LTD.
USER MANUAL
MODELS:
SPK-C612
Closed-back Ceiling Speakers
SPK-C412
Closed-back Ceiling Speakers
SPK-C411
Closed-back Ceiling Speakers
P/N: 2900-300113 Rev 1

Closed-back Ceiling Speakers – 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 Speakers 7
5.4 Painting the Speaker 10
6Technical Specifications 11
Figures
UFigure 1: Closed-back Ceiling Speakers in a Boardroom SetupU3
UFigure 2: SPK-C612 Closed-back Ceiling SpeakerU4
UFigure 3: SPK-C412 / SPK-C411 Closed-back Ceiling SpeakerU4
UFigure 4: Closed-back Ceiling Speaker Schematic DiagramU5
UFigure 5: Installing the Closed-back Ceiling SpeakersU7
UFigure 6: Plugging and Securing the CableU8
UFigure 7: Tighten the Mounting TabsU9
UFigure 8: Adjust Tap Selector (for the SPK-C612)U9

Closed-back Ceiling Speakers - 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 the video, audio, presentation, and broadcasting
professional 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 Matrix
Switchers; 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-C612, SPK-C412 and
SPK-C411 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-C612 and/or SPK-C412 and/or SPK-C411 speakers
•Mounting kit
•This user manual

2 Closed-back Ceiling Speakers - 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)
•Avoid interference from neighboring electrical appliances that may adversely
influence signal quality
•Position your Kramer Closed-back Ceiling Speakers 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.
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Closed-back Ceiling Speakers - Overview 3
3
3 Overview
The 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 [ " ] Resistance [
Ω
] Closed-back Depth [ " ]
SPK-C612 6.5 8 7
SPK-C412 4 8 4
SPK-C411 4 4 4
Figure 1 shows an example of how the Closed-back Ceiling speakers can be
installed in a boardroom setup:
Figure 1: Closed-back Ceiling Speakers in a Boardroom Setup

4 Closed-back Ceiling Speakers - Your Closed-back Ceiling Speakers
4 Your Closed-back Ceiling Speakers
Figure 2 and Figure 3 define the SPK-C612 and the SPK-C412 and SPK-C411,
respectively.
Figure 2: SPK-C612 Closed-back Ceiling Speaker
Figure 3: SPK-C412 / SPK-C411 Closed-back Ceiling Speaker

Closed-back Ceiling Speakers - Your Closed-back Ceiling Speakers 5
5
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
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 4 shows a schematic diagram of the Closed-back Ceiling speaker:
Figure 4: Closed-back Ceiling Speaker Schematic Diagram
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6 Closed-back Ceiling Speakers - Installing the Closed-back Ceiling Speakers
5 Installing the Closed-back Ceiling Speakers
This section explains how to install the 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.

Closed-back Ceiling Speakers - Installing the Closed-back Ceiling Speakers 7
7
Do not nail or staple the speaker wires.
If you are mounting the speakers onto a ceiling tile, remove the ceiling tiles where
you plan to install the speakers. Use the template to trace and then cutout the
speaker hole over an empty box.
The closed-back ceiling speakers are supported by the ceiling mounting kit (two C-
rings and two pairs of 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.
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.
When mounting onto a sheetrock ceiling, the C-ring alone is used to reinforce the
ceiling material.
5.3 Mounting the Speakers
To install the closed-back ceiling speakers, do the following:
1. Place the C-ring over the hole cut in the ceiling tile (on the “ceiling” side).
Place it around the hole so that the tabs are located in parallel to the tile
edges.
Figure 5: Installing the Closed-back Ceiling Speakers
!
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T-channel Grid
Support Ring
Screws
Ceiling Tile
Tile Rails
C-ring

8 Closed-back Ceiling Speakers - Installing the Closed-back Ceiling Speakers
2. Place the tile rails on the tile and snap them into the two tabs on the C-ring.
Align the rails so that the ends extend over the T-channel grid.
3. Insert a screw through each tab on the C-ring to secure the rails.
4. Connect the speaker wires to the appropriate connector terminals:
PIN 1 and PIN 2 are connected internally and are positive (+)
PIN 3 and PIN 4 are connected internally and are negative (-)
Screw the hold-down screws on the connector until tight, using a small
screwdriver.
You can connect the speakers in the two following possible layouts:
Wiring in parallel: connect the wire pair of the subsequent speaker to
PIN 2 and PIN 3. When one input connector is removed, subsequent
speakers will remain connected (see Figure 4)
Daisy-chaining: connect the wire pair of the subsequent speaker to
PIN 1 and PIN 4. When one input connector is removed, subsequent
speakers will be disconnected (see Figure 4)
5. Plug the connector into the socket in the terminal cup of the speaker (see
Figure 6).
6. Run the wires through the wires’ opening in the input terminal cover plug
and then into the terminal block connector of the speaker.
Figure 6: Plugging and Securing the Cable
7. Push the speaker into the ceiling hole until the front baffle rim is leveled with
the ceiling.