Bedienungsanleitung JBL mr 28 (Seite 4 von 8) (Englisch)

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part of the outer insulation; or a print-

ed “+” marking on one of the insula-

tors. 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.

When connecting the MR Center or

other MR 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

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

MR 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

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 MR 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

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.

Part B indicates that the amplifier can

handle 4-ohm combined impedances

created by two sets of speakers.

Left

Speaker

Amplifier/Receiver

Right

Speaker

Red Blk.

(+)

(–)

Red

Blk.

(+) (–)

Fig. 3

MR Series OM 7/28/98 10:32 AM Page 4

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