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
1 Introduction 1
2 Getting Started 2
2.1 Achieving the Best Performance 2
3 Overview 3
4 Your Closed-back Ceiling Speakers 4
5 Installing 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
6 Technical Specifications 11
Figures
UFigure 1: Closed-back Ceiling Speakers in a Boardroom SetupU 3
UFigure 2: SPK-C612 Closed-back Ceiling SpeakerU 4
UFigure 3: SPK-C412 / SPK-C411 Closed-back Ceiling SpeakerU 4
UFigure 4: Closed-back Ceiling Speaker Schematic DiagramU 5
UFigure 5: Installing the Closed-back Ceiling SpeakersU 7
UFigure 6: Plugging and Securing the CableU 8
UFigure 7: Tighten the Mounting TabsU 9
UFigure 8: Adjust Tap Selector (for the SPK-C612)U 9
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
i
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.
Closed-back Ceiling Speakers - Installing the Closed-back Ceiling Speakers 9
9
8. Tighten the mounting tabs by turning the screw counter clockwise (see
Figure 7).
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 7: 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
(see
Figure 8).
Figure 8: Adjust Tap Selector (for the SPK-C612)
10 Closed-back Ceiling Speakers - Installing the Closed-back Ceiling Speakers
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.
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.
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
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Closed-back Ceiling Speakers - Technical Specifications 11
11
6 Technical Specifications
SPK-C612
DESCRIPTION: 2-way co-axial speaker
HIGH FREQUENCY DRIVER: 1" MYLAR dome tweeter
LOW FREQUENCY DRIVER: 6.5” Polypropylene cone with rubber edge woofer
IMPEDANCE: 8Ω
CROSSOVER FREQUENCY: 8kHz
SENSITIVITY: 87dB
FREQUENCY RESPONSE: 55Hz to 20kHz
POWER RATING: 30W nominal, 60W Max.
RECOMMENDED AMPLIFIER
POWER:
30W
WEIGHT PER SINGLE SPEAKER: 2.85kg (6.28lbs) approx.
SHIPPING WEIGHT (FOR PAIR): 8kg (17.64lbs) approx.
DIMENSIONS (OD): 25.2cm (9.92")
CUT OUT SIZE (MOUNT
DIMENSION):
22.3cm (8.78")
MOUNT DEPTH: 19.5cm (7.68")
ACCESSORIES: Ceiling mounting kit
Specifications are subject to change without notice at http://www.kramerelectronics.com
SPK-C412 SPK-C411
DESCRIPTION: 2-way co-axial speaker
HIGH FREQUENCY DRIVER: 1" MYLAR tweeter
LOW FREQUENCY DRIVER: 4" Polypropylene cone with rubber edge woofer
IMPEDANCE: 4Ω 8Ω
CROSSOVER FREQUENCY: 10kHz 10kHz
SENSITIVITY: 85 dB 85dB
FREQUENCY RESPONSE: 85-20kHz 95-20kHz
POWER RATING: 20W nominal, 40W Max. 20W nominal, 40W Max.
RECOMMENDED AMPLIFIER POWER: 20W 20W
WEIGHT PER SINGLE SPEAKER: 2.2kg (4.85lbs) approx.
SHIPPING WEIGHT (FOR PAIR): 6kg (13.23lbs) approx.
DIMENSIONS (OD): 25.2cm (9.92")
CUT OUT SIZE (MOUNT DIMENSION): 22.3cm (8.78")
MOUNT DEPTH: 10.8cm (4.25")
ACCESSORIES: Ceiling mounting kit
Specifications are subject to change without notice at http://www.kramerelectronics.com
12 Closed-back Ceiling Speakers - Technical Specifications
LIMITED WARRANTY
WHO IS PROTECTED?
WHAT IS COVERED AND WHAT IS NOT COVERED
WHAT WE WILL PAY FOR AND WHAT WE WILL NOT PAY FOR
HOW YOU CAN GET WARRANTY SERVICE
LIMITATION OF IMPL IED WARRANTIES
EXCLUSION OF DAMAGES
CAUTION!
We warrant this product free from def ects in material and workmanship u nder the following terms.
HOW LONG IS THE WARRANTY
Labor and parts are warranted for one year from the date of the first customer purchase.
Only the first purchase customer may enforce this warranty.
We will pay labor and material expenses for covered items. We will not pay for the following:
The liability of Kramer for any effective products is limited to the repair or replacement of the product at our option. Kramer
shall not be liable for:
This warranty gives you specific legal rights, and you may also have other rights, which vary from place to place.
: All products returned to Kramer for service must hav e prior approval. This may be obt ained from your dealer.
This equipment has been tested to determine compliance with the requirements of:
EN-50081: " Electromagnetic compatibility (EMC);
generic emission standard.
Residential, commercial and light industry"
EN-50082: "Electromagnetic compatibility (EMC) generic immunity standard.
Part 1: Residential, commercial and light industry environment".
CFR-47: FCC* Rules and Regulations:
Part 15: “Radio frequency devices
Subpart B Unintentional radiators”
Except as below, this warranty covers all defects in material or workmanship in this product. The following are not
covered by the warranty:
1. An y product which is not distributed by us or which is not purchased from an authorized Kramer dealer. If you are
uncertain as to whether a dealer is authorized, please contact Kramer at one of the agents listed in the Web site
www.kramerelectronics.com.
2. Any product, on which the serial number has been defaced, modified or removed, or on which the WARRANTY VOID
TAMPERED sticker has been torn,
3. Damage, deteriora tion or malfunction resulting from:
i) Accident, misuse, ab use, neglect, fire, water, lightning o r other acts of nature
ii) P roduct modification, or failure to follow instructions supplied wit h the product
iii) Repair or attempted repair by anyone not authorized by Kramer
iv) Any shipment of the product (claims must be presented to the carrier)
v) Removal or in stallation of the product
vi) Any other ca use, which does not relate to a product defect
vii) Cartons, equipment enclosures, cables or accessories used in conjunction with t he product
1. Removal or installations charges.
2. Costs of initial technical adjustments (set-up), including adjustment of user controls or programming. These costs are
the responsibility of the Kramer dealer from w hom the product was purchased.
3. Shipping charges.
1. To obtain service on you product, you must take or ship it prepaid to any authorized Kramer service center.
2. Whenever warranty service is required, the original dated invoice (or a copy) must be presented as proof of
warranty coverage, and should be included in any shipment of the product. Please also include in any mailing a
contact name, company, address, and a description of the problem(s).
3. For the name of the nearest Kramer authorized service center, consult your authorized dealer.
All implied warranties, including warranties of merchantability and fitness for a particular purpose, are limited in duration
to the length of this warranty.
1. Damage to other property caused by defects in this product, damages based upon inconvenience, loss of use of the
product, loss of t ime, commercial loss; or:
2. Any other damages, whether incidental, consequential or otherwise. Some countries may not allow limitations on
how long an implied warranty lasts and/or do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitations and exclusions may not apply to you.
Servicing the machines can only be done by an authorized Kramer technician. Any user who makes changes or
modifications to the unit without the expressed approval of the manufacturer will void user authority to operate the
equipment.
Use the supplied DC power supply to feed power to the machine.
Please use recommend ed interconnection cables to c onnect the machine to other c omponents.
IF reattached, removed or otherwise interfered with.
* FCC and C E approved using ST P cable ( for twisted pair produ cts)
NOTE
Part 1:
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.
Web site:
E-mail:
www.kramerelectronics.com
info@kramerel.com
!
SAFETY WARNING
Disconnect the unit from the power
supply before opening and servicing
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