JBL Synthesis SCL-2 Manuel utilisateur

OWNER’S MANUAL

In-Wall Loudspeaker

JBL®SCL-2

CONTENTS

Introduction................................................................................................. 2

Package contents........................................................................................ 2

Speaker placement...................................................................................... 3

Left and right speakers .......................................................................... 3

Center channel speaker ......................................................................... 3

Surround speakers................................................................................. 5

5.1-channel systems.............................................................................. 5

7.1-channel systems.............................................................................. 5

General installation notes............................................................................. 6

Connecting the speakers to amplification ..................................................... 6

Back box installation.................................................................................... 8

Baffle wiring and installation....................................................................... 11

Specifications............................................................................................ 12

INTRODUCTION

THANK YOU for purchasing the JBL®SCL-2 In-Wall loudspeaker. For more than 70 years, JBL has provided audio

equipment for homes, concert halls, recording studios and movie theaters around the world. JBL products are

the hands-down choice of leading recording artists and sound engineers. The SCL-2 is the latest member of the

JBL Synthesis Home Theater system. To get the best performance from your new loudspeaker, please read these

instructions thoroughly.

IMPORTANT NOTES:

The SCL-2 requires a minimum 6-inch (152mm) wall depth.

The SCL-2 is not an appropriate speaker for ceiling use. Please consult your authorized JBL Synthesis

dealer for product options regarding in-ceiling speakers

PACKAGE CONTENTS

The SCL-2 is shipped as two inner cartons within an outer carton.

INNER CARTON 1 (BAFFLE) CONTENTS:

• 1 – SCL-2 Loudspeaker Baffle

• 1 – JBL Logo

• 10 – Baffle Screws

• 1 – Grille

INNER CARTON 2 (BACK BOX) CONTENTS:

• 1 – Back Box

• 10 – Back Box Mounting Screws

• 10 – Rubber Bushings

• 10 – Metal Washers

If you suspect that there has been shipping damage,

report it immediately to your dealer. We recommend that

you keep the box and packing materials for future use.

Inner Carton 1 Contents:

X 10

Inner Carton 2 Contents:

X 10

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English

SPEAKER PLACEMENT

Positioning your loudspeakers properly is critical in order to achieve the sonic performance of a home theater. Please

read the following section for guidance in correct and optimal placement.

LEFT AND RIGHT SPEAKERS

The SCL-2 is a perfect choice to serve as front left and right main speakers in a multi-channel system. Since they have

been designed for uniform coverage and maximum dispersion of sound, they should be placed with the center of the

speakers at about the same height on screen as the actors to aid in the illusion that the actors’ voices are coming

directly from their on-screen images. Ideally, the speakers will be placed about 60 degrees apart from each other

viewed from the listening position, so that the distance between the speakers is the same as each speaker’s distance

from the listener (Figure 1).

Although their acoustic coverage area allows mounting the speaker in any of the four possible orientations (horn above,

below, to the left or to the right of the two woofers), the preferred orientation is with the horn above the two woofers

(Figure 2). Ultimately, the best mounting orientation depends on the mounting location and room boundaries.

LEFT

SIDE

RIGHT

SIDE

Figure 1 Figure 2

CENTER CHANNEL SPEAKER

The SCL-2 may be oriented either vertically or horizontally when used as a center channel speaker. If the speaker

is being used with a perforated projection screen, it should be mounted behind the center of the screen with the

horizontal center axis aligned as close as possible to the center axis of the Left and Right channel speakers (Figure 3).

Figure 3

NOTE: Some perforated projection screens have a batten bar or crossbar centered across the screen frame (Figure 4).

In such cases make sure the bar does not block the horn. Position vertically oriented speakers so that the bar crosses

in front of the speakers at the edge of the horn closest to the central woofer.

Figure 4

If a non-perforated projection screen, LCD/plasma/OLED display is being used in the installation, the SLC-2 may be

used in horizontal orientation mounted directly below or above and as close as possible to the video display (Figure 5).

NOTE: It is extremely important to place the center, left and right speakers as close as possible to the same height.

The horn in the center channel speaker should be no more than 2 feet (61cm) higher or lower than those in the left

and right speakers. This preserves the localization integrity of “sound pans” in which the sound appears to move from

left to center to right. If the program material also appears to travel up and down, it can destroy the illusion of lifelike

panning effects. To mitigate the height difference between the center speaker the Left and Right channel speakers

should be lowered slightly. You can also rotate the L & R SLC-2s 180-degrees (upside down) to achieve a better match

of the acoustic height of all speakers (Figure 5).

LCD TV

Figure 5

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SURROUND SPEAKERS

The SCL-2 is an ideal choice for surround speakers as well. Placement of the surround speakers remains critical to

achieve the best possible surround imaging.

5.1-CHANNEL SYSTEMS

Surround speakers should be placed in the side walls no closer to the screen than the first row of viewing chairs. If

there are two rows of chairs, these speakers should be placed between the two rows. Surround speakers should be

placed higher than the seating area, at least 2 feet above seated ear level (Figure 6).

Min. 2'-0"

Figure 6

7.1-CHANNEL SYSTEMS

In a 7.1-channel system, two speakers are added for rear fill, in addition to the surround speakers in a 5.1-channel

system. The two additional speakers are placed on the rear wall or near the rear wall in the ceiling (Figure 7).

LEFT

SIDE

RIGHT

SIDE

LEFT

REAR

RIGHT

REAR

Figure 7

GENERAL INSTALLATION NOTES

1. Identify all wiring connections to rear enclosure and to baffle network.

2. Choose from the wiring options (single wire, bi-wire, bi-amp) before installation.

3. Note that this speaker requires a minimum of 6-inch (152mm) wall depth.

CONNECTING THE SPEAKERS TO AMPLIFICATION

To connect the Synthesis SCL-2 loudspeakers to power amplifier(s) or receiver, use two-conductor insulated speaker wire.

WIRE LENGTH RECOMMENDED SIZE

Up to 20 ft. 14-gauge

Up to 30 ft. 12-gaugue

Greater than 30ft. 10-gaugue

The SCL-2 spring-loaded binding posts can accommodate up to #10 AWG stranded wire.

PREPARING THE HOOK-UP WIRE

1. Determine the distance between your amplifier and the most distant speaker in each group (fronts, surrounds,

rear surrounds).

2. Make the hookup wires for all speakers in each group this same length, even if one speaker is much closer to

your amplifier than the farthest one to maintain proper channel balance. Remember to make extra wires for bi-

amp or bi-wire usage should you opt for either method.

3. Run wires through walls to the mounting positions.

4. Strip off 3/8" of insulation from both ends of each conductor and twist each set of stranded wires into a tightly

bunched spiral.

5. Speakers and electronics terminals have corresponding positive (+) and negative (–) terminals. Most

manufacturers of speakers and electronics, including JBL, Inc., use red to denote the (+) terminal and black for

the (–) terminal. Please confirm before connecting.

It is important to connect all speakers identically: (+) on the speaker to (+) on the ampliﬁer and (–) on

the speaker to (–) on the ampliﬁer. Wiring any one speaker “out of phase” (+ to - and - to +) to other

speakers in the system results in thin sound, weak bass and poor imaging.

Find a visual difference between the two conductors of each pair of speaker wires. Differentiating marks can be a

different color wire (copper or silver); a strand of yarn in one conductor; thin, raised ribs on one part of the outer

insulation; or a printed marking on one part of the outer insulation. It doesn’t matter which of the two strands go to the

(+) and (–) on the speakers and amplifiers, as long as all speakers are connected identically positive (+) to positive (+),

negative (–) to negative (–) (Figure 9).

Receiver/Amplifier

(One Channel Shown)

Side View of SCL-2 with

Speaker Connection Panel

Figure 9

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BI-WIRE OR BI-AMPLIFIER OPTIONS

The SCL-2 has two sets of connectors to allow for bi-wire or bi-amp operation.

1. Cut two pair of wires for each bi-wired speaker.

2. Mark both ends of the wire pairs intended for low frequency use as “LF,” and both ends of the wire intended for

high frequency use as “HF.” Then run the two sets of wire to the mounting position.

3. Connect “HF” labeled pair to the speaker’s “HF” input, and the “LF” labeled pair to the “LF” input. (Figure 10)

4. Before installing the speaker that will be bi-wired or bi-amplified, remove the two blue jumpers, Bi-amp Jumper

Hot and Bi-amp Jumper Ground (Figure 11). The blue jumpers are located on the terminal cup on the inside of

the back box. Squeeze the connectors for the jumpers just below where the wire is crimped to the connector to

release the connector lock. If this doesn’t work, slide the plastic boot back onto the wire and depress the lever

for the lock with a ballpoint pen or small tool while pulling gently on the wire.

5. Proceed to install the back box and speaker following the instructions elsewhere in this manual.

Low Frequency

Receiver/Amplifier

High Frequency

Receiver/Amplifier

Side View of SCL-2 with

Speaker Connection Panel

Bi-Amp Connection

(Be sure to remove internal jumpers)

Figure 10

Single-Amp

Jumper Hot

(Blue)

Single-Amp

Jumper Ground

(Blue)

Figu re 11

BACK BOX INSTALLATION

TERMINAL CUP

FOAM ANTI-VIBRATION PADS

BRACE SCREW - DO NOT TOUCH!3

WOOD BLOCK FOR MOUNTING SCREWS

INPUT WIRES

MOUNTING BARS

CABINET BRACE

Figure 12

IMPORTANT NOTES:

The JBL SYNTHESIS SCL-2 speaker requires a minimum 6-inch (152mm) wall depth.

The SCL-2 is a large, heavy loudspeaker. Installation will go more smoothly and safely with two people. We strongly

suggest enlisting the aid of a helper when installing this product.

The crossover with Molex connector is at one end of the back box. Be sure to orient the back box in the correct

orientation to achieve the desired horn alignment (horn up, down, left, right) and speaker orientation before cutting

existing drywall or installing the back box (Figure 13).

HORN

END

Figure 13

For vertical orientation mounting, the SCL-2 should be located between two wall studs.

If you need to cut through existing wall studs, make sure in advance that they are not load bearing studs.

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NOTE: Figure 14 is a terminal cup-end view of the backbox with measurements to help guide you in cutting a hole or

holes through the stud framing to run your speaker wires to the terminals of the SCL-2.”

3.32 inches3.32 inches

2.28 inches

Figure 14

VERTICAL ORIENTATION INSTALLATION STEPS:

(For horizontal orientation installation skip to next page)

1. Cut a hole in the drywall from existing stud to existing stud that is 46 inches

(117cm) high. This allows sufficient clearance to install 2x6s to the side studs

and install top and bottom 2x6 caps.

2. Use 2x6s to create a frame with 38.25" x 11.5" (971.6mm x 292.1mm) internal

dimensions (Figure 15). Secure to existing studs with nails or woodscrews.

3. Install new drywall up to the edge of the new 2x6 frame (post-drywall

installations only). Some spackle and tape work will be required.

4. Connect the signal wires to the terminals on top of the back box as described

on Page 6

5. Orient the back box so that the input terminals are closest to where you want

the horn to be located.

6. Lift the back box into the space defined by the frame. DO NOT USE THE

MOUNTING BARS TO LIFT THE BACK BOX; lift the back box by the

cabinet braces.

7. Allow the mounting bars to rest on the drywall to establish the proper back box

depth. In new construction installations, tack a piece of scrap drywall onto the

2x6 frame to establish box depth.

8. Use drywall or wood screws to secure the mounting bars to the frame or studs

under the drywall The mounting bars temporarily hold the back box in position.

9. Install rubber bushings into the top, bottom and middle mounting holes. Place

a metal washer onto each 5" deck screw and insert the screws through the

rubber bushings into the adjoining 2x6 frame. Tighten the screws enough to

expand the isolator mounts (bushings), but do not tighten beyond this point.

10. Make sure the back box is securely attached to the frame and then remove the

mounting bars completely. Discard.

11. Repeat step 8 with the remaining mounting holes

Move to BAFFLE ASSEMBLY WIRING AND INSTALLATION on Page 11. Figure 15

14.5''

11.5''

38.25''

HORIZONTAL ORIENTATION INSTALLATION STEPS:

IF INSTALLING IN NEW CONSTRUCTION (PRE-DRYWALL), SKIP STEP 1

1. Cut a 46" wide x 14.5" high (971.6mm x 292.1mm) hole in the drywall. The center of the hole should align

with the center of the video display.

2. Cut completely through the wall studs that fall inside the space needed for the SCL-2 (Figure 16). MAKE

SURE IN ADVANCE THAT THEY ARE NOT LOAD BEARING STUDS.

3. Use 2x6s to create a frame with 38.25" x 11.5" (971.6mm x 292.1mm) internal dimensions (Figure 17).

Secure to existing studs with nails or woodscrews.

4. Install new drywall up to the edge of the new 2x6 frame (post-drywall installations only). Some spackle and

tape work will be required.

5. Connect the signal wires to the terminals on top of the back box as described on Page 6.

6. Orient the back box so that the input terminals are closest to where you want the horn to be located.

7. Lift the back box into the space defined by the frame. DO NOT USE THE MOUNTING BARS TO LIFT

THE BACK BOX; lift the back box by the cabinet braces.

8. Allow the mounting bars to rest on the drywall to establish the proper back box depth. In new construction

installs, tack a piece of scrap drywall on the nearest studs to establish box depth.

9. Use drywall or wood screws to secure the mounting bars to the studs under the drywall. The mounting bars

temporarily hold the back box in position.

10. Install rubber bushings into the left, right and middle mounting holes. Place a metal washer onto each 5"

deck screw and insert the screws through the rubber bushings into the adjoining 2x6 frame. Tighten the

screws enough to expand the isolator mounts (bushings), but do not tighten beyond this point.

11. Make sure the back box is securely attached to the frame and then remove the mounting bars completely.

Discard.

12. Repeat step 8 with the remaining mounting holes.

14.5''

46''

Figure 16

11.5''

38.25''

Fi gur e 17

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