Bogen CSUB User Manual

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Ceiling Subwoofer

Model CSUB

Installation and Use Manual

© 2008 Bogen Communications, Inc. All rights reserved.

Specifications subject to change without notice. 54-2171-01B0810

Product Description

Thank you for choosing Bogen’s CSUB Ceiling Subwoofer. Please familiarize yourself with the product by reading and reviewing the descriptions and diagrams in this manual.

Bogen’s CSUB delivers unsurpassed performance and value. This subwoofer can be installed either in suspended ceiling structures or hard surfaces (such as drywall). It is ready to install with swinging arm clamps that take the place of a tile bridge for installation in suspended ceilings.

A variety of speaker power levels are easily selected via a front panel rotary switch. Settings for both 70V and 8-ohmsystems are provided.

The CSUB features a removable snap-lockinput connector, providing easy wire connection for input as well asloop-throughto the next speaker.


The CSUB is not an outdoor speaker. Do not expose the CSUB to rain or moisture.The CSUB should only be installed by qualified personnel.

Important Safety Instructions

1) Read these instructions.

2)Keep these instructions.

3)Heed all warnings.

4)Follow all instructions.

5)Do not use this apparatus near water.

6)Clean only with dry cloth.

7)Do not block any ventilation openings. Install in accordance with manufacturer’s instructions.

8)Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9)Only use attachments/accessories specified by the manufacturer.

10) Recommended amplifier for 64W @ 70V use should be 65W @ 70V. Higherpower amplifiers should be used with additional current limiting, such as a fuse.

11) Refer all servicing to qualified personnel.Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

To prevent injury, this apparatus must be securely attached to the ceiling or wall in accordance with the installation instructions.


Product Diagrams

Front Drawing (grille removed)

1. Driver Assembly (internal)


3.Grille Retention Groove

4.24" CeilingTile Guide Arrows (×2)

5.PowerTap Selection Switch

6.14-1/2" Joist Space Guide Arrows (×2)

7.Mounting Clamp Screws (×4)






Front Drawing

(grille removed)

Side Drawing

8.Metal Back Can

9.Snap-LockInput Connector

10.Terminal Cover (side view)

11. Mounting Clamps (×4)

Rear Drawing

12. SafetyTether Point

13. Snap-LockInput Connector

14.Terminal Cover (top-downview)

15.Wire Exit Slot

16.Terminal Cover Anchor Screw (×2; one on back,

one below connector)





Side Drawing









Rear Drawing


Speaker Placement

The low frequency capability of the CSUB allows great flexibility in its placement.While full-rangespeakers will typically be installed throughout the ceiling in an evenly spread pattern, the CSUB can be placed wherever it is most convenient. This usually means where the subwoofers best meet the needs of the overall sound system, or may sometimes mean where they best fit into the ceiling. This flexibility is useful in irregularlyshaped rooms or when the depth of the area behind the ceiling surface varies.

An important performance parameter to keep in mind is that the location of the subwoofer will affect its output sound pressure level (SPL) within a room.Locating the CSUB close to a wall will increase its output by approximately 3 dB over locating it toward the center of the ceiling area.The 3 dB increase will effectively double the amount of output power coming from the subwoofer. Locating the CSUB in the corner of a room, adjacent to 2 perpendicular wall surfaces, will increase its output by 6 dB.This 6 dB increase effectively quadruples the output of the subwoofer compared with locating it closer to the center of the room.The tradeoff for this extra output is a less uniform overall sound level, especially in large rooms.

Three possible locations for a CSUB Subwoofer within a larger sound system:



Center of Ceiling: Optimum Bass Distribution


Most Uniform Sound Level



Near Corner: + 6 dB Output

Near Wall: + 3 dB Output



Note:The CSUB may be placed as close as 5" from a wall, provided care is taken to ensure that mounting clamps are properly extended (seeInstallation section). If mounting clamps cannot be properly extended, another location must be found.



The unique clamp-mountingsystem of the Bogen CSUB not only allows mounting in most types of ceiling surface thicknesses, it takes the ease of installation two significant steps further:

1. NO TILE BRIDGE IS REQUIRED. Because the mounting clamps are extra-longand very durable, they can suspend and support the CSUB across the 24" span of a suspended ceiling.This eliminates the need for the separate tile bridge required for nearly all ceiling speakers.

2. A uniquely designed clamp screw assembly can be tightened from either the front or rear, allowing the CSUB to be mounted either by dropping the ceiling tile onto the rear of the CSUB or by dropping the CSUB into the front of the ceiling tile. This design can significantly accelerate the installation process.


There must be a minimum of 11" of vertical clearance (12-1/4"if using the CK10 Safety Cable Kit) between thefront of the mounting surface and any other structure in the ceiling for the speaker to fit. Before cutting the full hole, investigate for depth and clearance by cutting a small hole, or removing the ceiling tile, whichever is applicable.

SUSPENDED CEILINGS:The clamps must be able to span the full 24" (approx.) between the ceiling rails to provide the proper support for the CSUB. If there is interference with any objects in the ceiling to prevent this,then another ceiling tile location should be chosen.

DRYWALL or OTHER Hard Ceiling Surfaces:The edge of the hole must have clearance of at least 5" on opposite edges of the hole to ensure that the clamps will be able to support the CSUB.


Support rail
Mounting clamps (×4)
Mounting clamps extend to, but do not overhang, edge of ceiling tile.
2×2 CeilingTile

Installation (cont.)


1. Remove the ceiling tile from the ceiling grid. Cut a 14-1/4"circular hole in the ceiling tile. Use the included template as a guide.

2.Put the CSUB face down on a workbench or on the floor without grille installed.

3.Place the ceiling tile over the CSUB, making

sure the ceiling tile is facing out.It is important to note the direction of the clamps: they must be installed so that they span the distance from one side of the ceiling tile to the other (approx. 24", see illustration at right). The front of the CSUB is engraved with guide arrows for “24Inch Ceiling Tile” (see Product Diagrams section). Use these guides for this installation.

4. Using an electric powered screwdriver with the clutch at a low setting, tighten each screw until the clamps are just snug against the tile surface. The CSUB’s clamps can be tightened from either the front or rear of the speaker. Use a No. 3 Phillips screwdriv-

er when working from the front. Use a 1/4" flat-bladescrewdriver when working from the rear. If working from the rear of the speaker, the screws tightenCOUNTERCLOCKWISE. Do notover-tightenclamps. Once all four clamps are properly positioned and snug on the ceiling tile, the assembly (CSUB and ceiling tile) is ready to be mounted in the ceiling grid.

5.Before installing the grille, make sure you have selected the proper power setting on the front panel rotary switch. Refer to the Selecting Power Levels section for instructions on selecting the power level. Install the grille as indicated in the

Speaker Grille Installation & Removal section.

6.Before mounting the CSUB/tile assembly, make sure the snap-lockinput connector has been connected to the input wires (seeSpeaker Wiring section). The CSUB/tile assembly may now be placed in the ceiling grid. By accessing the ceiling space through an adjacent ceiling tile, plug in thesnap-lockconnector.Attach the Terminal Cover using the screws provided. If using conduit, refer to theTerminal Cover section of this manual.

7.Attach the CK10 Safety Cable, if it is being used, by screwing the eyebolt into the safety tether point in the rear of the CSUB’s metal enclosure (see Product Diagrams).This may be a local code requirement. It is certainly a very good safety measure, particularly in suspended ceiling installations. For more information see the instruction sheet included with the CK10.


Installation (cont.)


1 Be sure you know the location of the ceiling joists before cutting the speaker opening. Cut a 14-1/4"circular hole where the CSUB will be installed.Use the included template as a guide.

2.Make electrical connections to the snap-lockinput connector and then plug it into the CSUB (seeSpeakerWiring section).

3.Install terminal cover using the supplied screws. If using conduit, refer to the Terminal

Cover section of this manual.

Mounting clamps extend to joists.

4. Place the CSUB in the ceiling cut-out.To help properly place the CSUB in the ceiling, the front of the CSUB is engraved with guide arrows for “14-1/2" Joist Space” (see Product Diagrams, #6). Use these guides for this installation.


Be certain to position the subwoofer so that the engraving “14-1/2"Joist Space” aligns perpendicularly between the studs.Failure to do so may result in the clamps being unable to swing out far enough to seat the speaker properly.

14-1/2Inches between ceiling joists.

5.Using an electric screwdriver with the clutch at a low setting, tighten each clamp screw until the clamps are just snug against the ceiling surface. Once all four clamps are snug on the ceiling, the four clamp screws should be tightened with the next clutch setting or with a hand screwdriver. Do not over-tightenclamps.

6.Before installing the grille, make sure you have selected the proper power setting on the front panel rotary switch. Refer to the Selecting Power Levels section for instructions on selecting the power level. Install the grille as indicated in the

Speaker Grille Installation & Removal section.



All wiring should be done prior to installation and then plugged into the rear of the speaker.Wiring is terminated at a snap-lockinput connector. There are two positive and two negative terminals to accommodatedaisy-chainingof speakers in a system.


The snap-lockinput connector allows for easydaisy-chainingof speakers by providing a second terminal of each polarity. See the figures to the right and below for correct wiring fordaisy-chain-ing of terminals.

Note: When speakers aredaisy-chained,disconnecting one speaker from the chain will disable all speakers further down the chain.

Speaker Polarity

Keep the same polarity terminals wired together to ensure correct speaker polarity. In order to provide the best possible sound, all speakers – both subwoofers and full-rangespeakers – in a system need to be pushing out and pulling in at the same time.Therefore all must be wired with the same polarity.

If the connections to one speaker in a system are reversed from the others, that speaker’s movement will be out of polarity with the other speakers.This results in a loss of low frequency response and will effect the overall performance of the system.

Terminal Cover

The terminal cover is attached to the back of the speaker housing using 2 screws. It is important that both screws be used to mount the cover.

A slot in the terminal cover allows the wires to exit the speaker while protecting the connections.

If local codes require the use of a conduit for connections or strain relief of the connections, a circular knockout can be removed and a proper fitting installed to meet these requirements.


Selecting Power Levels

The front-mountedselector switch is used to set the appropriate power level or impedance for your system. Using your fingers or aflat-bladescrewdriver, turn the knob until the arrow points to the power level you require.

70V Systems

A power setting scale for 70V systems is labeled on the switch. Six settings are available, from 2 to 64 watts.


The fully counterclockwise position of the setting switch is the 8-ohmposition.This setting is suitable for use withlow-impedanceamplifiers that typically support 4- or8-ohmspeakers.

Speaker Grille Installation & Removal


The speaker grille fits tightly! Push the speaker grille in until it can go no further.Then, slap around the edge of the grille to seat the grille. The grille is properly seated when it is flush with the edge of the bezel.

Note: Black butyl rubber tape is included for extra security in holding the grille in place.Cut four small pieces and space them equidistant around the groove in the baffle where the grille fits.The butyl rubber tape is quite sticky and it is not necessary to use an excessive amount.


Insert a pocketknife blade between the grille and the bezel about 1/4" deep and then gently pry the grille upwards. Do this in multiple places around the circumference of the grille to free the grille.





Frequency Response (-6dB)*

40 Hz to 125 Hz

Sensitivity (1W/1M)*

91 dBspl





Power Input (Max.)

150W @ 8 ohms; 64W @ 70V



Power Settings (in watts)

70V: 64, 32, 16, 8, 4, 2

Baffle Material

Fire-rated(94V0) ABS



Back Can Material





4-TerminalSnap-LockInput Connector



Included Accessories

(1) Snap-LockInput Connector, (1) Steel Terminal Cover with


(2) mounting screws, and (1) Package, Butyl Tape

Optional Accessories

10-Ft.Safety Cable Kit (CK10)



MinimumVertical Clearance

11" Without CK10 Safety Cable Kit

(From front of mounting surface)

12-1/4"When using CK10 Safety Cable Kit



Ceiling Cutout





19 lb.



Speaker Dimensions

15-1/2"dia. x 11" D



* Half-spaceresponse(ceiling-mounted),8-ohminput

Front panel,switch-selected


CK10 (10-Ft.Safety Cable Kit)

The CK10 is a 10-footcable with one looped end and an adjustable cable clamp. It is suitable for use as a safety cable. On the CSUB Ceiling Subwoofer, the CK10 attaches to the safety tether point on the rear of the housing (seeProduct Diagrams).