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5
Caution for Speaker Connection
1. Turn off the POWER switch.
2. Remove the cover attachment screw(s) and remove the
protective cover from the speaker terminals.
Screw
3. After removing approx. 10 mm of insulation from the
ends of the speaker cables, pass the bare ends of the
speaker wires through the holes in the corresponding
speaker terminals and tighten the terminals to securely
clamp the wires.
Refer to page 3 for speaker porality.
10 mm
At this time make sure that the bare ends of the speaker
cables do not extend from the terminals in such a way
that they touch the chassis.
4. Reattach the protective cover over the speaker termi-
nals.
• Speaker fuse
The output capacity of your amplifier is very high: 460
W+460 W (8Ω) in stereo and 1240 W (8Ω) in monaural
on the P4500; 340 W+340 W (8Ω) in stereo and 880 W
(8Ω) in monaural on the P3200; 160 W+160 W (8Ω) in
stereo and 400 W (8Ω) in monaural on the P1600. Be
sure to use a speaker system that has sufficient input
capacity.
If the input capacity of your speaker system is lower than
the rated output of the power amplifier, you can protect
your speakers by connecting a fuse serially between the
speaker and amplifier as shown below.
_
+ _
+
Power amplifier
Speaker system
Fuse
Use the following formula to determine the fuse capacity
according to the speaker’s input capacity.
Po = I R → I = √Po/R
2
P0 [W] : Speaker’s continuous input capacity (noise or
RMS)
R [Ω] : Speaker’s nominal impedance
I [A] : Required fuse capacity
ex.) Speaker’s continuous input capacity : 100 W
Speaker’s impedance : 8Ω
I = √100/8
In this example, the required fuse capacity is calculated
as 3.5 [A].
• Speaker cable
If you use a long speaker cable, use as thick a cable as
possible to prevent deterioration of the damping factor
or power loss inside the cable.