Harman Kardon AVR 247 Service Manual Download Page 14

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CONNECTIONS

There are different types of audio and video connections used to
connect the receiver to the speakers and video display, and to connect
the source devices to the receiver. To make it easier to keep them all
straight, the Consumer Electronics Association (CEA

) has established

a color-coding standard. Table 1 may be helpful to you as a reference
while you set up your system.

Table 1 – Connection Color Guide

Types of Connections

This section will briefly review different types of cables and connections
that you may use to set up your system.

Speaker Connections

Speaker cables carry an amplified signal from the receiver’s speaker
terminals to each loudspeaker. Speaker cables contain two wire conduc-
tors, or leads, inside plastic insulation. The two conductors are usually
differentiated in some way, by using different colors, or stripes, or even
by adding a ridge to the insulation. Sometimes the actual wires are
different, one being copper-colored and the other silver.

The differentiation is important because each speaker must be connected
to the receiver’s speaker-output terminals using two wires, one positive
(+) and one negative (–), referred to as speaker polarity. It’s important
to maintain the proper polarity for all speakers in the system. If some
speakers have their negative terminals connected to the receiver’s positive
terminals, performance can suffer, especially for the low frequencies.

Always connect the positive terminal on the loudspeaker, which is usually
colored red, to the positive terminal on the receiver, which is colored as
shown in the Connection Color Guide (Table 1). Similarly, always connect
the black negative terminal on the speaker to the black negative terminal
on the receiver.

The AVR 247 uses binding-post speaker
terminals that can accept banana plugs
or bare-wire cables. Banana plugs are
simply plugged into the hole in the middle
of the terminal cap. See Figure 1.

Figure 1 – Binding-Post Speaker Terminals With Banana Plugs

Bare wire cables are installed as follows (see Figure 2):

1. Unscrew the terminal cap until the pass-through hole in the collar is

revealed.

2. Insert the bare end of the wire into the hole.

3. Hand-tighten the cap until the wire is held snugly.

Figure 2 – Binding-Post Speaker Terminals With Bare Wires

Subwoofer

The subwoofer is a specialized type of loudspeaker that is usually
connected in a different way. The subwoofer is used to play only the
low frequencies (bass), which require much more power than the other
speaker channels. In order to obtain the best results, most speaker
manufacturers offer powered subwoofers, in which the speaker contains
its own amplifier on board. Sometimes the subwoofer is connected to
the receiver using the front left and right speaker outputs, and then the
front left and right speakers are connected to terminals on the subwoofer.
More often, a line-level (nonamplified) connection is made from the
receiver’s Subwoofer Output to a corresponding jack on the subwoofer,
as shown in Figure 3.

Although the subwoofer output looks similar to the analog audio jacks
used for the various components, it is filtered and only allows the low
frequencies to pass. Don’t connect this output to any other devices.
Although doing so won’t cause any harm, performance will suffer.

Figure 3 – Subwoofer

Connecting Source Devices to the AVR

The AVR 247 is designed to process audio and video input signals,
playing back the audio and displaying the video on a television or
monitor connected to the AVR. These signals originate in what are
known as “source devices,” including your DVD player, CD player, DVR
(digital video recorder) or other recorder, tape deck, game console,
cable or satellite television box or MP3 player. Although the tuner is
built into the AVR, it also counts as a source, even though no external
connections are needed, other than the FM and AM antennas and the
XM antenna module.

Separate connections are required for the audio and video portions of
the signal, except for digital HDMI connections. The types of connections
used depend upon what’s available on the source device, and for video
signals, the capabilities of your video display.

Subwoofer

Preout

Always connect colored (+) terminal on AVR to red (+) terminal
on speaker; and black (–) to black (–).

Branchez toujours la borne (+) colorée sur AVR à la borne (+) rouge sur le haut-parleur;
et la noire (–) à la noire (–).

Conecte siempre el terminal de color (+) en el AVR al terminal rojo (+) en el altavoz;
y el negro (–) al negro (–).

HOW TO USE THE BINDING-POST SPEAKER TERMINAL

COMMENT UTILISER LA BORNE DES HAUT-PARLEURS DE CONNEXION

CÓMO USAR EL TERMINAL DE ALTAVOZ DE POSTE DE SUJECIÓN

Audio Connections

Left Right

Front

(FL/FR)