Altec Lansing SLC408 CEILING SPEAKER User manual

1000 W. Wilshire Blvd., Suite 362 yOklahoma City, Oklahoma 73116 yPhone: 405.848.3108 yFax: 405.848.3217 ywww.altecpro.com
SLC408-16T
Preassembled Ceiling Speaker System
FEATURES – THE ALTEC LANSING DIFFERENCE
•High Fidelity – 8 in. (203 mm) Duplex® Component
•Industry-Leading Efficiency – 98 dB SPL
•High Output – 113 dB Peak SPL (16 watt Tap)
•Preassembled Speaker System for Quick Installation
•Off-White Décor Snap-On One Piece Metal Grille
•5-Position Switch for Easy Transformer Tap Selection
•Metal Tile Bridge Included
GENERAL PRODUCT DESCRIPTION
Over the past twenty-five years, Altec Lansing has sold more
premium eight-inch Duplex® ceiling speakers than any other
manufacturer. Consultants and sound contractors have long
considered Altec’s eight-inch ceiling speaker components their
preferred choice for high fidelity music playback and critical
speech intelligibility applications. The SLC408-16T takes our best-
selling premium high fidelity 8 in. (203 mm) Duplex® component
and offers it in a preassembled, quick-mount ceiling speaker
package.
The SLC408-16T features Altec’s premium CD408-16T component.
The CD408 is an 8 in. (203 mm) Duplex® component rated at 32W
AES / 128W peak power handling. The high quality 16 watt
70V/100V transformer has a broadband insertion loss of < 0.6 dB
from 50 Hz to 15 kHz.
Altec’s high efficiency Duplex® design delivers maximum output
with minimum amplifier power. At an industry-leading broadband
efficiency rating of 98 dB SPL (1W/1m), the SLC408-16T has rated
peak output of 113 dB SPL using the 16 watt transformer tap at a
distance of one meter. Less efficient ceiling speaker systems
require 60W transformers to generate similar output. The high
efficiency design of the SLC408-16T allows the systems integrator
to downsize the amplifier channel assigned to each zone of
ceiling speakers by a factor of two-thirds or more.
The CD408-16T is installed in a round, metal, dampened 0.25
cubic foot enclosure with metal strain relief strap. Three metal
dogleg arms are screwed-down to secure the enclosure to the
included metal tile bridge. An off-white one piece metal décor
grille snaps into the assembly. The SLC408-16T has a two-wire
input connection (red & black), making it fool-proof for even the
least experienced installers. The ½ in. (13 mm) connector easily
mates to either metal or flex conduit.
Installers particularly like Altec’s package. The mounting hole in
the metal tile bridge serves as a hard template for cutting a
perfect hole in the ceiling tile. A metal S-hook allows the
installer to hang the enclosure from the ceiling grid of flex-
conduit while wiring up the SLC408-16T.
In addition to industry-leading efficiency and output, the SLC408-
16T is among the most lightweight packages available to sound
contractors. The low-profile design allows the SLC408-16T to fit
into tight ceiling spaces. An optional ring (SLC-RING) is required
for plaster or sheetrock ceilings.
NOTE: SHIPPED IN PAIRS
SPECIFICATIONS
FREQUENCY RESPONSE 1, 2
135 Hz – 16 kHz (±5 dB)
USABLE LOW FREQUENCY LIMIT (-10 dB) 1, 2
115 Hz
SENSITIVITY 3
98 dB SPL
POWER HANDLING 4
32 W AES (continuous); 128 W peak
PEAK OUTPUT (1 m) 5
119 dB SPL; 113 dB SPL (16W transformer tap)
COVERAGE ANGLES 6
80º (horizontal) by 80º (vertical)
DIRECTIVITY FACTOR, Q 6
11.14
DIRECTIVITY INDEX, DI 6
10.47 dB
TRANSDUCER COMPONENTS
LF: 1 x 8-in. (203 mm), low frequency woofer
HF: 1 x 3-in. (76 mm), high frequency tweeter
IMPEDANCE 7
Nominal: 8.0 ohms
Minimum: 7.8 ohms at approximately 8 kHz
CROSSOVER FREQUENCY
Passive LF - HF: 2,500 Hz
TRANSFORMER
Premium 16 watt 70V/100V, switch selectable taps of 16W, 8W,
4W, and 2W; rated at < 0.6 dB insertion loss, 50Hz – 15 kHz
INPUT CONNECTIONS
Only 2 wires, pre-stripped, for simple, quick installation
FINISH
Enclosure - Black Painted Steel with internal damping material
Grille – Matte White Décor Round Metal Grille
DIMENSIONS
Diameter: Can - 9.25 in. (235 mm); Baffle – 11.75 in. (298 mm)
Grille – 12.75 in. (324 mm)
Depth: Can – 7.85 in. (199 mm)
NET WEIGHT
9.8 lbs. (4.45 kg), one speaker system with grille
SHIPPING WEIGHT
34.3 lbs. (15.56 kg), (includes 2 speaker systems with grilles and tile bridges)
CD408-8A – THEILE-SMALL PARAMETERS
Free Air Resonance, ƒS: 84.4 Hz
Equivalent Volume Compliance, VAS: 1.0 ft.3(28.3 l)
Total Q, QTS: 0.94
Electrical Q, QES: 1.10
Mechanical Q, QMS: 6.52
D.C. Resistance, RE: 7.2 ohms
Peak Linear Displacement, Xmax: 0.008 in. (0.2 mm)
Reference Efficiency, ηo: 1.50%

INSTALLATION AND WIRING
Although the SLC408-16T can be mounted into a sheetrock or
plaster ceiling, the following installation procedure is intended
for suspended tile ceilings. Note: We recommend that you order
the mounting ring (SLC-RING), not included, when installing the
SLC408-16T into a sheetrock or plaster ceiling.
1. Place ceiling tile, finished side facing up, over the flat, 12 in.
(305 mm) to 22 in. (559 mm) diameter opening of a container
such as a Rubbermaid®32 gallon Brute®model 2632.
2. Locate the approximate center of the mounting hole that is to
be cut, and mark this spot on the ceiling tile. Note: This
center can be located anywhere along the length of the
ceiling tile that is at least 8 in. (203 mm) from either end and
equidistant from each side edge.
3. Align the center of the 10.75 in. (273 mm) tile bridge hole
with the spot marked as the center, and position the metal
tile bridge flat against the ceiling tile with the ends of the tile
bridge aligned to the side edges of the ceiling tile.
4. Carefully, so as not to damage the ceiling tile, temporarily
secure the tile bridge in-place with adjustable torsion clamps
such as C-clamps.
5. Guide the blade of a RotoZip®RZ01, or similar rotary cutting
tool, against the edge of and completely around the 10.75 in.
(273 mm) tile bridge hole, cutting the ceiling tile hole.
6. Remove the torsion clamps and tile bridge from the ceiling
tile.
7. Install the ceiling tile in the ceiling’s T-grid.
8. Install the tile bridge on top of the ceiling tile, and align the
tile bridge hole with the newly cut ceiling tile hole.
9. Pull the wiring and or flex conduit through the tile bridge and
ceiling tile holes.
10.Attach one end of the S-hook to the SLC408-16T’s metal strain
relief strap and rest the other end of the S-hook, through the
mounting hole, on the top surface of the tile bridge.
11.Connect the audio transmission (-) wire (usually black) to the
black wire of the SLC408-16T, and connect the audio
transmission (+) wire to the red wire of the SLC408-16T.
Secure a sufficient insulator cover over these connections.
Note: Proper rated wire-nuts are recommended to insulate
these connection points.
12.If flex conduit is used, pack the excess wire into the conduit
(including the wire nuts), and secure the flex conduit with the
½ in. (13 mm) connector.
13.Remove the S-hook and gently push the SLC408-16T (and
excess conduit or wire) up into the hole and tighten the three
mounting screws, causing the dogleg arms to swing out and
anchor the enclosure to the metal tile bridge.
14.Snap on the metal grille.
ARCHITECT’S AND ENGINEER’S SPECIFICATIONS
The loudspeaker system shall be an in-ceiling design, consisting
of a Duplex®8 in. (203 mm) diameter cone woofer and a 3 in. (76
mm) diameter cone tweeter. This loudspeaker component shall
have a power rating of 32W AES (128W peak). The loudspeaker
system shall have an operating bandwidth of 135 Hz to 16 kHz,
with a sensitivity of 98 dB at one watt, when measured at one
meter. The loudspeaker system shall include a 5-position switch
for adjustable load/output requirements. The switch shall
terminate the two 18 gauge input wires directly to the nominal 8
ohm impedance of loudspeaker component, or indirectly to the
loudspeaker component through a step-down, multi-tap 16W
transformer. This transformer shall have an insertion loss of < 0.6
dB. The loudspeaker component, switch and transformer shall be
assembled into a moisture resistant black-painted steel enclosure
with internal damping material. The enclosure diameter shall be
9.31 in. (236 mm), the enclosure’s baffle diameter shall be 11.75
in. (298 mm), and the enclosure’s depth shall be 7.85 in. (199
mm), including the ½ in. (13 mm) flex-conduit connector. The
loudspeaker system shall include a 12.75 in. (324 mm) diameter,
one-piece, snap-on, off-white-painted steel grille; and a 23.75 in.
(603 mm) long, 14 in. (356 mm) wide, 20 gauge galvanized steel
tile bridge. The loudspeaker system shall be the Altec Lansing
Professional model SLC408-16T.
SPECIFICATION NOTES
1The frequency response of the loudspeaker system is measured at a distance of no less than 3 meters to obtain full range data. The
level is then corrected to be equivalent to a 2.83 V 1 m measurement. A near field measurement of the system is performed for
frequencies below 500 Hz. This data is then combined with the full range measurement to give an accurate composite frequency
response curve.
2The limits of the frequency response are referenced to -5 dB of the loudspeaker’s rated sensitivity in the SLC’s 0.25 ft.3sealed
enclosure.
3The sensitivity of the loudspeaker system is the log based average SPL taken over the intended bandwidth of operation for the system
with a 2.83 V swept sine stimulus. The data is measured and level corrected in a manner consistent with note 1.
4The power handling capacity of the loudspeaker system is tested using a full range form of AES Standard 2-1984. The test stimulus is
band limited (40 Hz – 16 kHz) pink noise with a 6 dB crest factor. The applied RMS voltage is determined using the minimum impedance
of the system. The amplifier used to drive the loudspeaker has a minimum operating headroom of 6 dB referenced to the RMS voltage.
5The peak output level of the system is calculated based on the sensitivity and the peak power handling capabilities of the system.
6The coverage angles for the loudspeaker are taken as the -6 dB points of the directivity response and averaged from 500 Hz to 16 kHz.
7The minimum impedance of the loudspeaker is taken over its intended band of operation.
As we are continually striving to improve Altec Lansing products, specifications are subject to change without notice.
VISIT WWW.ALTECPRO.COM FOR
•Authorized EASE data on all Altec Lansing Professional loudspeakers
•PDF specification sheets. Download page 1 of the specification sheet for you submittals.
•One paragraph A&E Specifications in .doc format
•The latest information on Altec Lansing Professional products.
•Performance specifications for the CD408-series speakers, including the one-octave polar response charts.
© 2004 Altec Lansing Professional y1000 W. Wilshire Blvd., Suite 362 yOklahoma City, Oklahoma 73116
Phone: [phone] yFax: 1.405.848.3217 yEmail: [e-mail]
Revision 01
20 50 100 200 500 1 k 2 k 5 k 10 k 20 k
Frequency (Hz)
60
70
80
90
100
110
dB SPL (ref: 20 Pa)
Frequency Response