Connection Of Speakers(Contd.) - InterM EMI-300 Handbuch

7-CHANNEL 2 X 150W MIXING AMPLIFIER
Connection of Speakers (contd.)
Connection of Speakers (contd.)
HOW TO WIRE SPEAKERS IN SERIES
Series wiring means that the speakers are daisy-
chained, very much like the small bulbs in a christmas-
tree illumination set. When making the connections,
you have to make sure that the signal flow inside a
speaker is always from '+' to '-', like in the illustration
below.
In a series wiring, the impedances of the individual
speakers add up to the total impedance, which in turn
increases with every new speaker in the chain. In
order to keep the total impedance low, series wiring
should only be performed with speakers that have low
individual impedances (4 ohms or less).
CALCULATION OF IMPEDANCES
For calculation of the total impedance Z tot , you can
also use the formulas below.
MIXED WIRING
By making clever use of both series and parallel
wiring, it is often possible to wire a larger number of
speakers to built a network with 4 ohms total imped-
ance.
If you want to use four identical speakers per channel,
you can use one of the sample networks below. Both
networks are wired so that the resulting total imped-
ance equals the individual speaker impedance. If, for
example, 4 ohms speakers are used, the total imped-
ance will also be 4 ohms which perfectly matches the
EMI-300 amplifiers
10
EMI-300
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Total impedances for
black red parallel wiring
- +
Single speaker
Amount of
speakers 4Ω 8Ω 16Ω
1 4Ω
- +
2 8Ω
3 12Ω
- +
Example for series wiring
with 3 cabinets.
- +
Parallel wiring:
1
Z =
tot
1/Z + 1/Z + 1/Z
3 . . .
1 2
Series wiring:
Z = Z + Z + Z
3 . . .
tot 1 2
+ -
+
+ - -
+
-
- +
- +
impedance
8Ω 16Ω
16Ω 32Ω
24Ω 48Ω
+ -
- +
+ -
- +