Harman Kardon AVR 145, Service Manual

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15
CONNECTIONS
There are different types of audio and video connections used to con-
nect 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 Cables
This section will briefly review different types of cables and connections
that you may use to set up your system.
Speaker Cables
Speaker cables carry an amplified signal from the receiver’s speaker ter-
minals to each loudspeaker. Speaker cables generally contain two wire
conductors, 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 red and the other silver.
The differentiation is important because each speaker must be connect-
ed to the receiver’s speaker-output terminals using two wires, one posi-
tive (+) and one negative (–). This is called speaker polarity. It’s impor-
tant 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 fre-
quencies.
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 con-
nect the black negative terminal on the speaker to the black negative
terminal on the receiver.
The AVR 145 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.
Figure 1 – Binding-Post Speaker
Terminals With Banana Plugs
Bare wire cables are installed as follows:
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. Screw the cap back into place 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 con-
nected 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 sub-
woofer. More often, a line-level (nonamplified) connection is made
from the receiver’s Subwoofer Output to a corresponding jack on the
subwoofer.
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 your other devices.
Although doing so won’t cause any harm, performance will suffer.
Figure 3 – Subwoofer
Connecting Source Devices to the AVR
The AVR 145 is designed to process audio and video input signals,
playing back the audio and displaying the video on a television or moni-
tor 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.
In general, separate connections are required for the audio and video
portions of the signal. The types of connections used depend upon
what’s available on the source device, and for video signals, the capabili-
ties of your video display.
S ubwoofer
Pre-out
1 2 3
+
Au d io Conn e ctions
L e ft Right
Front (FL/FR)
C e nt e r (C)
Surroun d (SL/SR)
Subwoof e r (SUB)
Surroun d B a ck (SBL/SBR)
Digit a l Au d io Conn e ctions
Co a xi a l
Optic a l Input Output
Vi de o Conn e ctions
Compon e nt Y Pb Pr
Composit e
S-Vi de o
AVR 145 OM (New) 8/4/06 1:19 PM Page 15
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AVR145
harman/kardon