As you move further to one

side, the image should remain cen-

tered, if you have used the recom-

mended 2 to 3 meter spacings dis-

cussed earlier. If you are using a

wider spacing, then the image may

tend to move toward the nearer

loudspeaker. !f this takes place, it is

your cue to angle both loudspeak-

ers inward slightly, so that more

correction will take place. Be sure

to angle both loudspeakers the

same amount, so that side-to-side

symmetry is maintained. Details

here are shown in Figure 2.

Figure 2, For loudspeaker spacing in excess of

3 meters, set a in the range of 5 to 10 degrees.

ELECTRICAL CONNECTIONS:

The models $2600 and $3100

are can be operated by a normal

stereo amplifier, or they may be

operated in “bi-wire” configuration.

For standard operation, bus bars

connect the two sets of terminals

on the back of each enclosure so

that both high and low frequency

sections of the dividing network are

electrically in parallel.

In the bi-wiring configuration, a

separate amplifier section feeds

each of the high and low frequency

portions independently. In bi-wiring,

the full signal is applied to both

high and low frequency sections of

the cividing network; however, the

network will restrict the current flow

only to those signals intended for

the high or low frequency trans-

ducer. Bi-wiring has the advantages

of biamplification, but without the

need for an external electronic

dividing network. A schematic dia-

gram of the bi-wiring option is

shown in Figure 3.

GRILLES:

Grilles are a complement to the

details and industrial design of the

loudspeaker system. However,

many listeners prefer to operate

their loudspeakers with the grilles

removed, even though JBL has

used the most acoustically trans-

parent materials available. The

choice is strictly up to the listener.

THEORY OF OPERATION:

The uniform imaging properties

of the S2600 and S3100 systems

are based on the asymmetrical hori-

zontal coverage patterns that the

two loudspeakers produce. Above

1kHz, the high frequency horn’s

pattern ranges from wide, directly

in front of the system, to narrow, as

the listener moves off axis toward

the middle of the array and beyond.