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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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
Training rooms
Hotel lobbies
Conference rooms
Educational classrooms
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).
i
SPK-C411 / SPK-C412 - Introduction
1
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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
user manuals, application programs, and to check if firmware
upgrades are available (where appropriate).
i
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.
i
UL2043 – Fire Test for Heat and Visible Smoke Release for
Discrete Products and their Accessories Installed in Air-Handling
Spaces.
2
SPK-C411 / SPK-C412 - Getting Started
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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 [ " ]
Closed-back Depth [ " ]
Impedance [ Ω ]
SPK-C411
SPK-C412
4
4
4
8
4
4
Figure 1 shows 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
SPK-C411 / SPK-C412 - Overview
3
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4
Your Closed-back Ceiling Speakers
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
Two grilles
Cutout
speakers
(one shown)
template
(one shown)
This table defines the ceiling mounting kit items:
Four
support
ring
Two ceiling
support rings
(C-ring) – one
shown
Two pairs of
tile rails –
one of a pair
shown
screws
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SPK-C411 / SPK-C412 - Your Closed-back Ceiling Speakers
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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.
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When this is the case, the speakers will need additional support.
Figure 3 shows a schematic diagram of the Closed-back Ceiling speaker:
Figure 3: Closed-back Ceiling Speaker Schematic Diagram
SPK-C411 / SPK-C412 - Your Closed-back Ceiling Speakers
5
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5
Installing the Closed-back Ceiling Speakers
This section explains how to install the SPK-C411 / SPK-C412 closed-back ceiling
speakers, that is:
•
•
•
•
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
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.
6
SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers
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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.
i
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 SPK-C411 / SPK-C412 Speakers
To mount 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.
T-channel Grid
C-ring
Support Ring
Tile Rails
Screws
Ceiling Tile
Figure 4: Mounting the SPK-C411 / SPK-C412 Closed-back Ceiling Speakers
SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers
7
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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
.
Daisy-chaining: connect the wire pair of the subsequent speaker to
PIN 1 and PIN 4. When one input connector is removed, subsequent
5. Plug the connector into the socket in the terminal cup of the speaker (see
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 5: Plugging and Securing the Cable
7. Push the speaker into the ceiling hole until the front baffle rim is leveled with
the ceiling.
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SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers
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8. Tighten the mounting tabs by turning the screw counter clockwise (see
The first quarter turn, rotates the tab outwards, and the following turns tighten the tabs
to the rear side of the ceiling surface
When tightening the mounting tabs, the tabs automatically turn outward,
thus clamping the speaker to the wall from its rear side.
Note: Do not over-tighten the screws. It may cause damage to both the
speakers and the surface.
Figure 6: Tighten the Mounting Tabs
9. If required, you can further secure the speaker by connecting the speaker
support ring to an independent secure anchor point.
10. Adjust each speaker to the appropriate tap setting before installing the grille
Figure 7: Adjust Tap Selector (for SPK-C411 and SPK-C412, Respectively)
SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers
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11. Install the grilles to the speakers:
.
.
Push the grille fastener into the hole in front of the baffle
Press the grille into place until the front of the grille is flush with the rim
of the baffle
.
Check that the grille is securely seated
To remove the grille, insert two bent paper clips into the holes in the
grille and carefully pull it down. Repeat this around the perimeter of
the grille until it is completely removed.
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5.4
Painting the Speaker
You can paint the speakers before or after they are installed.
When painting before installation:
•
Clean the rim and grille with mineral spirits or other light solvent that is
unlikely to damage the surface
•
Spray with color by holding the spray can at an angle of 45°
When spraying the grille, take care not to clog the holes in the grille
as this will greatly reduce the sound quality of the speakers.
i
When painting after installation:
•
•
Use the circle that you cut out of the template as a paint mask
After you finish painting, remove the paint mask
10
SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers
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6
Technical Specifications
SPK-C411
Audio and Power
DESCRIPTION:
2-way ceiling speakers with metal back can
HIGH FREQUENCY DRIVER:
LOW FREQUENCY DRIVER:
IMPEDANCE:
1/2" MYLAR dome tweeter
4” Polypropylene cone with rubber edge woofer
4Ω
DISPERSION COVERAGE:
CROSSOVER FREQUENCY:
NOMINAL SENSITIVITY:
DIRECTIVITY FACTOR (Q):
DIRECTIVITY INDEX (DI):
FREQUENCY RESPONSE:
INPUT POWER:
75˚ - 100° @(2000Hz)
6000Hz
84dB SPL @1m, 1W
5.7 (averaged 100Hz-10kHz); 6.8 (2kHz)
6.5dB (averaged 100Hz-10kHz); 4.8dB (2kHz)
75Hz to 20kHz
30W RMS; max. 40W, continuous load (24hr) 30W
TRANSFORMER:
70V – 3.7W/7.5W/15W/30W
100V – 7.5W/15W/30W
RECOMMENDED AMPLIFIER
POWER:
20W
INPUT CONNECTOR:
Terminal block
Shipping and Installation
WEIGHT PER SINGLE SPEAKER:
SHIPPING WEIGHT (FOR PAIR):
DIMENSIONS (OD):
2.75kg (6.06lbs) approx.
7.9kg (17.42lbs) approx.
25.1cm (9.88")
CUT OUT SIZE (MOUNT
DIMENSION):
22.3cm (8.78")
MOUNT DEPTH:
ACCESSORIES:
11cm (4.33")
Ceiling mounting kit
Specifications are within a 10% tolerance and are subject to change without notice at
SPK-C411 / SPK-C412 - Technical Specifications
11
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SPK-C412
Audio and Power
DESCRIPTION:
2-way ceiling speakers with metal back can
1/2" MYLAR dome tweeter
HIGH FREQUENCY DRIVER:
LOW FREQUENCY DRIVER:
IMPEDANCE:
4” Polypropylene cone with rubber edge woofer
8Ω
DISPERSION COVERAGE:
CROSSOVER FREQUENCY:
NOMINAL SENSITIVITY:
DIRECTIVITY FACTOR (Q):
DIRECTIVITY INDEX (DI):
FREQUENCY RESPONSE:
INPUT POWER:
75˚ - 100° @(2000Hz)
6000Hz
84dB SPL @1m, 1W
5.7 (averaged 100Hz-10kHz); 6.8 (2kHz)
6.5dB (averaged 100Hz-10kHz); 4.8dB (2kHz)
75Hz to 20kHz
30W RMS; max. 40W, continuous load (24hr) 30W
TRANSFORMER:
70V – 3.7W/7.5W/15W/30W
100V – 7.5W/15W/30W
RECOMMENDED AMPLIFIER
POWER:
20W
INPUT CONNECTOR:
Terminal block
Shipping and Installation
WEIGHT PER SINGLE SPEAKER:
SHIPPING WEIGHT (FOR PAIR):
DIMENSIONS (OD):
2.75kg (6.06lbs) approx.
7.9kg (17.42lbs) approx.
25.1cm (9.88")
CUT OUT SIZE (MOUNT
DIMENSION):
22.3cm (8.78")
MOUNT DEPTH:
ACCESSORIES:
11cm (4.33")
Ceiling mounting kit
Specifications are within a 10% tolerance and are subject to change without notice at
12
SPK-C411 / SPK-C412 - Technical Specifications
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For the latest information on our products and a list of Kramer distributors,
visit our Web site where updates to this user manual may be found.
We welcome your questions, comments, and feedback.
SAFETY WARNING
Disconnect the unit from the power
supply before opening and servicing
!
P/N:
Rev:
2900-300188
1
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