Kramer Electronics Speaker SPK C612 User Manual
KRAMER ELECTRONICS LTD.  
USER MANUAL  
MODEL:  
SPK-C612  
Closed-back Ceiling Speakers  
P/N: 2900-300187 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-C612 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-C612 speakers  
Mounting kit  
This user manual  
SPK-C612 is designed for indoor dry locations and are suitable for  
use in air handling spaces (plenum spaces).  
i
SPK-C612 - 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  
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).  
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-C612 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-C612 - Getting Started  
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3
Overview  
The SPK-C612 consists 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 SPK-C612 speakers feature a diameter of 6.5”, a resistance of 8Ω and a  
closed-back depth of 7”. Figure 1 shows an example of how the SPK-C612 can be  
installed in a boardroom setup:  
Figure 1: SPK-C612 in a Boardroom Setup  
SPK-C612 - Overview  
3
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4
Your SPK-C612 Closed-back Ceiling  
Speakers  
Figure 2 defines the SPK-C612:  
Figure 2: SPK-C612 Closed-back Ceiling Speaker  
The following table defines the SPK-C612 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  
4
SPK-C612 - Your SPK-C612 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.  
i
When this is the case, the speakers will need additional support.  
Figure 3 shows a schematic diagram of the SPK-C612:  
Figure 3: SPK-C612 Schematic Diagram  
SPK-C612 - Your SPK-C612 Closed-back Ceiling Speakers  
5
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5
Installing the SPK-C612 Closed-back Ceiling  
Speakers  
This section explains how to install the SPK-C612, 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.  
6
SPK-C612 - Installing the SPK-C612 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 Speakers  
To mount the SPK-C612, 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-C612  
SPK-C612 - Installing the SPK-C612 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  
speakers will remain connected (see Figure 3)  
.
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 3)  
5. Plug the connector into the socket in the terminal cup of the speaker (see  
Figure 5).  
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.  
8
SPK-C612 - Installing the SPK-C612 Closed-back Ceiling Speakers  
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8. Tighten the mounting tabs by turning the screw counter clockwise (see  
Figure 6).  
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  
(see Figure 7).  
Figure 7: Adjust Tap Selector  
SPK-C612 - Installing the SPK-C612 Closed-back Ceiling Speakers  
9
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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.  
i
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-C612 - Installing the SPK-C612 Closed-back Ceiling Speakers  
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6
Technical Specifications  
Audio and Power  
DESCRIPTION:  
2-way co-axial low-profile ceiling speakers with  
metal back can  
HIGH FREQUENCY DRIVER:  
LOW FREQUENCY DRIVER:  
IMPEDANCE:  
1" MYLAR dome tweeter  
6.5” Polypropylene cone with rubber edge woofer  
8Ω  
DISPERSION COVERAGE:  
CROSSOVER FREQUENCY:  
NOMINAL SENSITIVITY:  
DIRECTIVITY FACTOR (Q):  
DIRECTIVITY INDEX (DI):  
FREQUENCY RESPONSE:  
INPUT POWER:  
80°  
3kHz  
87dB SPL @1m, 1W  
5.1 (averaged 100Hz – 10kHz); 6.2 (2kHz)  
6.8dB (averaged 100Hz – 10kHz); 5.0dB (2kHz)  
55Hz to 20kHz  
30W RMS, 60W Max., continuous load (24hr) 40W  
70V – 3.7W/7.5W/15W/30W  
TRANSFORMER:  
100V – 7.5W/15W/30W  
RECOMMENDED AMPLIFIER  
POWER:  
30W  
INPUT CONNECTOR:  
Terminal block  
Shipping and Installation  
WEIGHT PER SINGLE SPEAKER:  
SHIPPING WEIGHT (FOR PAIR):  
DIMENSIONS (OD):  
2.85kg (6.28lbs) approx.  
8kg (17.64lbs) approx.  
25.1cm (9.88")  
CUT OUT SIZE (MOUNT  
DIMENSION):  
22.3cm (8.78")  
MOUNT DEPTH:  
ACCESSORIES:  
19.45cm (7.66")  
Ceiling mounting kit  
Specifications are within a 10% tolerance and are subject to change without notice at  
http://www.kramerelectronics.com  
SPK-C612 - Technical Specifications  
11  
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