JBL CSA-2120 Manuale utente

6

2.0 Setup

2.1 Unpacking Your Ampliﬁer

Please unpack and inspect your ampliﬁer for any damage that may have occurred

during transit. If damage is found, notify the transportation company immediately.

Only you can initiate a claim for shipping damage. We will be happy to help

as needed. Save the shipping carton as evidence of damage for the shipper’s

inspection.

We also recommend that you save all packing materials so you will have them if you

ever need to transport the unit. Never ship the unit without the factory pack.

WARNING: Before you start to set up your ampliﬁer, make sure you read and

observe the Important Safety Instructions found at the beginning of this manual.

2.2 Installing Your Ampliﬁer

CAUTION: Before you begin, make sure your ampliﬁer is disconnected from the

power source and all level controls turned completely down (counterclockwise).

To install the ampliﬁer, you can use one of the following approaches:

• Rack mount the ampliﬁer with the rack mounting kit, see Figure 2.2.3 and

Figure 2.2.4.

• Install the amplifer to the wall with the mounting kit, see Figure 2.2.5.

• Stack amps without using a cabinet. For ampliﬁer dimensions, see Figure

2.2.1.

NOTE: When transporting, ampliﬁers should be supported at front.

7

Solution A: Rack Mounting an Ampliﬁer and CST-2120 Transformer Module

To install an ampliﬁer and a CST-2120 transformer module in your cabinet system,

refer to Figure 2.2.3 and follow the steps below:

1. Align two modules side by side, with the front panel towards the same direction.

2. Connect them with the ﬂat bracket.

3. Attach an angle bracket to each side of the ampliﬁer assembly with screws.

4. Install the ampliﬁer assembly into the cabinet. For details of installation in the

chassis of the cabinet, refer to the user guide of your cabinet.

Figure 2.2.1 Dimensions

Figure 2.2.2 Mounting Kit

long angle bracket

ﬂat bracket

angle bracket

Unit: mm [inches]

Figure 2.2.3 Rack mounting an ampliﬁer and CST-2120 Transformer Module

8

Solution B: Rack Mounting Single Ampliﬁer

To install single ampliﬁer in your cabinet system, refer to Figure 2.2.4 and follow the

steps below:

1. Attach the long angle bracket to one side of the ampliﬁer that you need to

reserve as dummy module with screws.

2. Attach an angle bracket to the side of the long angle bracket.

3. Attach an angle bracket to another side of the ampliﬁer with screws.

4. Install the ampliﬁer assembly into the cabinet. For details of installation in the

chassis of the cabinet, refer to the user guide of your cabinet.

Solution C: Wall Mounting

To install the ampliﬁer to wall, refer to Figure 2.2.5 and follow the steps below:

1. Attach two angle brackets to both sides of the ampliﬁer with screws.

2. Install the ampliﬁer assembly to a ﬂat and secure position on the wall (for drywall

it is recommended to use #12 x 1-1/2 in. or M6 x 40mm screws into a #12-14 x

1 – ½ in. anchor.) A minimum clearance of 4” should be provided on all sides of

the assembly to allow for heat dissipation.

Figure 2.2.4 Rack Mounting Single Ampliﬁer

Figure 2.2.5 Wall Mounting

9

2.3 Ensuring Proper Cooling

When using an equipment rack, mount units directly on top of each other. DO NOT

block side air vents. The back of the rack should be open.

2.4 Choosing Input Wire and Connectors

We recommend using pre-built or professionally wired balanced line (two-conductor

plus shield) 22-24 gauge cables to connect the ampliﬁer balanced input by using

shipped two 3-pin Euroblock connectors, see Figure 2.4. Unbalanced lines may be

used, but may result in hum or RF noise very long cable runs.

You can also use RCA connectors to connect audio devices, for example, CD/DVD

player. However, do not use both Euroblock and RCA audio input connectors on a

single channel at the same time.

NOTE: Custom wiring should only be performed by qualiﬁed personnel.

Figure 2.4 Input Wiring

Note: Do not use both Euroblock and RCA audio input connectors on a single

channel at the same time.

10

2.5 Output Wiring

To drive distributed speaker systems designed to operate at 70V or 100V, connect

the ampliﬁer to a CST-2120 transformer module with the jumper cable that shipped

with the CST-2120 transformer module, see Figure 2.5.1.

JBL recommends using pre-built or professionally wired, high-quality, two-conductor,

heavy gauge speaker wire. Speakers wires should be twisted cable, if possible. To

prevent the possibility of short-circuits, the wires should be stripped back no greater

than 6 mm (1/4 inch), see Figure 2.5.2.

Suggested below are guidelines to select the appropriate size of wire based on the

distance from ampliﬁer to speaker. Check with local code as this may vary.

Distance Wire Size

Up to 25 ft. (7.6m) 16AWG

26-40 ft. (7.9-12.2m) 14AWG

Figure 2.5.1 Connecting To a CST-2120 Transformer Module

NOTE: If driving a 70V or 100V distributed speaker system, use the optional CST-

2120 transformer module (see Appendix A).

TO

Speaker

TO

Speaker

Figure 2.5.2 Connecting to Speakers

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