Inter-m EMI-300 - Speaker Wiring Techniques; Parallel and Series Wiring

11
EMI-300
7-CHANNEL 2 X 150W MIXING AMPLIFIER
How To Wire Speakers In Parallel
Connect all '+' terminals on the speakers to the red
'+' terminal of the EMI-300 output and all '-'
terminals on the speakers to the black '-' terminal of
the EMI-300 output. For wiring in parallel, connect
the first speaker to the EMI-300 and the following
speaker to the terminals of first speaker, as shown in
the illustration to the right.
As shown in the table, impedances below 4Ω should
not be used for the EMI-300.
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 '-', as it is
in the illustration to the right.
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 (4Ω or less).
Calculation of Impedances
Use the formula shown on the right to calculate total
impedance.
-+
-+
-+
black red
from Amplifier
Amount of
speakers
* not recommended
Single speaker
impedance
4Ω 8Ω 16Ω
1
2
3
4Ω
*
*
8Ω
4Ω
*
16Ω
8Ω
5Ω
Total impedances for
parallel wiring
more speakers
-+
-+
-+
-+
from Amplifier
black
Example for series wiring
with 3 cabinets.
red
Amount of
speakers
Single speaker
impedance
4Ω 8Ω 16Ω
1
2
3
4Ω
8Ω
12Ω
8Ω
16Ω
24Ω
16Ω
32Ω
48Ω
Total impedances for
parallel wiring
Parallel wiring:
Series wiring:
Z
tot
=
Z
tot
= Z
1
+ Z
2
+ Z
3
. . .
1/Z
1
+ 1/Z
2
+ 1/Z
3
. . .
1