Protection Function - Kenwood KAC-718 Instruction Manual

Protection function

This unit is equipped with a protection function for protecting this unit and your speakers
from various accidents or problems that can occur.
When the protection function is triggered, the Power indicator goes off and the amplifier
stops operating.
Power indicator:
When the power is turned on, the Power indicator lights.
If the Power indicator does not light when the power is turned on, the protection function
may be activated. Check whether there is any indication of trouble.
The protection function activates in the following situations:
• When a speaker cable may be short-circuited.
• When a speaker output contacts ground.
• When the unit malfunctions and a DC signal is sent to the speaker output.
• When the temperature of internal parts exceeds 120°C (248°F).
• When a ground cable of the center unit (cassette receiver, CD receiver, etc.) or this unit is
not connected to a metal part serving as an electrical ground passing electricity to the
battery's negative - terminal.
Connection
Speakers cable connection
Speaker Selection
• The rated input power of the speakers that are going to be connected should be greater than
the maximum 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.
• Use speakers that have an impedance of 2Ω or greater. 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.
240W
(4 )
4
Maximum output of
the amplifier
Power indicator
MONO POWER AMPLIFIER
Subwoofer
240W
240W
(4 )
(4 )
(120W/8 )
8
Combined
impedance
MONO POWER AMPLIFIER
SPEAKER OUTPUT
120W
(4 )
240W
(4 )
120W
(4 )
(420W/2 )
Rated input power and
impedance of the speakers
SPEAKER OUTPUT
MONO
MONO
U T
T P
O U
R
K E
N O
E A
M O
S P
Lead terminal
(Commercially available parts)
240W 240W
(4 ) (4 )
2
5
English