JBL j50 owner manual Hooking Up Multiple Sets of Speakers, Nominal impedance

part of the outer insulation; or a printed “+” marking on one of the insulators. It does not make any difference which of the two strands of wire go to (+) and (–) on the speakers and amplifier, as long as all speakers used in your system are connected identically. Push down on the button below the terminal and insert the wire through the hole.

For each channel, the red terminal on all loudspeakers should be connected to the red or (+) speaker connection terminal on the receiver or amplifier, and the black to black or (–) speaker connection terminal (see Fig. 3). Connecting the loudspeakers in this manner ensures that they will be in phase; that is, work together rather than in opposition. This is very important when connecting sev- eral speakers together in a Dolby Pro-Logic AV application. Connecting the loudspeakers out of phase will not damage them, but will result in less bass and poor imaging.

from each speaker. The use of the “test tone” and the controls on your AV receiver will enable you to cor- rectly balance the level (volume) of sound coming from each speaker in your Dolby Pro-Logic application.

Hooking Up Multiple Sets of Speakers

If your receiver has two complete sets of speaker terminals (“A” and “B”), it’s possible to hook up an addi- tional pair of speakers for simultane- ous sound in another room. However, some speakers may not be usable as a second pair if you want to play two sets at once. Before hooking up another set of speakers besides your J Series loudspeakers, check the following:

1. Your amplifier’s minimum load

impedance.

2. The nominal impedance of the

second set of speakers. Both of

these specifications are expressed in

ohms and both can be found in the

owner’s manuals which came with

your speakers and amp/receiver. The

receiver’s minimum load impedance

Left

Speaker

Red Blk.

(+) (–)

Right

Speaker

Red Blk.

(+) (–)

Fig. 3

is determined by whether or not

power ratings are given for 4 ohms.

This is because two sets of 8 ohm

speakers will present a 4 ohm load to

the receiver. The J speaker, when

combined with an 8 ohm speaker,

produces an impedance sufficiently

close to 4 ohms. For example, the

following entry in an amplifier owner’s

+L + R

Amplifier/Receiver

When connecting the J Center or other J Series speakers to a Dolby Pro-Logic AV receiver, refer to the instructions accompanying your AV component for use of the “test tone” to properly balance the sound output

manual...

POWER:

A)100 watts RMS into 8 ohms, both chan- nels driven, 20-20kHz with less than 0.02%THD

B)160 watts RMS into 4 ohms, both channels driven, 20-20kHz with less than 0.02% THD.

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