Kenwood KAC-748 - Manual (Page 8)

Connection
■ Speaker Selection
• The rated input power of the speakers that are going to be connected should be greater than
the maxi mu rn output power {in Watts) of the amplifier. Use of speakers having input power
ratings that are less than the output power of the amplifier will cause smoke to be emitted as
well as damage.
• The impedance of the speakers that are going to be connected should be 2Ii or greater (for
stereo connections), or 4ft or greater (for bridged connections). When more than one set of
speakers are going to be used, calculate the combined impedance of the speakers and then
connect suitable speakers to the amplifier.
Examples:
Model Stereo Connections (4^1) Bridged Connections f4ft^
KAC-848 100 W or greater 300 W or greater
KAC-748 70 W or greater 200 W or greater
200W®
(4ft)
0
__i^
iH
200W
(4£i)
200W®
(4ft) 0 m
to
200W
(2ft)
200W
(2ft) ^
•
...........
• • • • 4ft
Maximum output of
the amplifier
4ft
Combined
impedance
Rated input power and
impedance of the speakers
Power wire connection
AWARNING
To prevent fire caused by a short in the wiring, connect a fusible link or breaker nearby the battery's
positive terminal.
Wiring
• If a buzzing noise is heard from the speakers when the engine is running, connect a line noise filter
(optional) to each of the battery wire.
• Do not allow the cord to directly contact the edge of the iron plate by using Grommets.
• Connect the ground wire to a nhetal part of the car chassis that acts as an electrical ground passing
electricity to the battery's negative © terminal. Do not turn the power on if the ground wire is not
connected.
• Be sure to attach a protective fuse into the battery wire close to the battery. Use a protective fuse
having a capacity that is about 10 A higher than the maximum current drawn by the amplifier.
• Use vehicle-type (fire-resistant) power supply wiring wire for the battery wire and the ground wire.
The current capacity of the power supply wiring wire should be about 10 A higher than that of the
protective fuse capacity (which means about 20 A higher than the maximum current drawn by the
amplifier).
• When more than one power amplifier are going to be used, use a power supply wiring wire and
protective fuse of greater current-handling capacity than the total maximum current drawn by each
amplifier.
Example: One Power Amplifier Is Used
Mode/ Maximum Current
Drawn
Protective Fuse Cross-sectional Area of Winng
Wire (AWG)
KAC-848 38 A 50 A
X
1 125 A
X
21 5 mm^ (AWG 10) or greater x 1
KAC-748 28 A 40 A
X
1 [20 A
X
2] 5 mm^ (AWG 10) or greater x T
8
English