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Low-Z Stereo amplifier
(one channel used)
Cables A-1 | A-2 | A-3 | A-4 | B-1 |
B-2 | B-3 | B-4 must all have the
same cross-section and the same
length!
Only use with 8 Ohm drivers
Total load impedance for amp
output A is 4 Ohms with 8 Ohm
drivers
Max. power per speaker is
50W RMS
8 Speakers, mono
NOTE:
B. Wiring
Before connecting your SPB-8420 to your amplifier(s) and speakers, please take the necessary
safety precautions, and prepare the proper cable materials.
Cable Choice
The choice of suitable speaker cables is often a neglected but at the same time essential point of a
low-impedance sound system installation. Speaker cables, specifically long ones, can significantly
contribute to the load impedance of the amplifier, thus reducing the power output and turning some
of the output power into heat instead of delivering it to the speakers. The most important aspect is to
keep cables as short as possible and to choose a sufficient copper cross-section, with maximum
length values as per below:
Cross-Section
AWG
2 Ohms
4 Ohms
6 Ohms
8 Ohms
0.75 mm
2
18
1.00 m
2.00 m
3.00 m
4.00 m
1.5 mm
2
15
2.00 m
4.00 m
6.00 m
8.00 m
2.5 mm
2
13
3.50 m
7.00 m
10.50 m
14.00 m
4.0 mm
2
11
5.00 m
10.00 m
15.00 m
20.00 m
DANGER - risk of electric shock. Audio power amplifiers can generate output voltages in
excess of the limits considered harmless to the human body. Initial cabling or any modifica-
tion of cabling shall only be expedited with all amplifiers switched off.
DANGER - risk of fire. Audio power amplifiers may not be secured against output shortcir-
cuits and may be damaged if such short circuit occurs, with such damage potentially lead-
ing to a fire hazard. Any cabling activity bears the danger of unwanted, temporary short
circuits. Initial cabling or any modification of cabling shall only be expedited with all amplifi-
ers switched off.
USER MANUAL - SPB8420 LowZ SPEAKER PATCH BOX
SPB8420
