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8.1.2 Two Connectors
If the loudspeaker has two NL or AP type connectors, they are wired in parallel so you can
"Y-connect" multiple loudspeakers together to a single amplifier channel. This is
commonly known as "daisy chaining." This will lower the load impedance on the
amplifier. This can be calculated by this formula:
(Nominal impedance single loudspeaker) / (number of loudspeakers daisy chained)
8.1.3 Barrier Strip or Terminal Block Connectors
The proper connections are marked for each terminal on the loudspeaker input label,
normally as "+" and "-".
8.1.4 Loudspeaker Wire Gauge
The proper conductor size (wire gauge) to
use for the loudspeaker cable is primarily
a function of the wire length. The general
rule is that lower resistance, in relation to
the loudspeaker's impedance, is better. To
achieve this, use larger conductor sizes for
longer lengths of cable and for lower
impedance loudspeaker loads.
To provide a sufficient damping factor (DF) for low frequency drivers, use loudspeaker
cable with conductor sizes per the following chart. For cable lengths over 200 feet at 8
ohms, over 100 feet at 4 ohms, and over 50 ft at 2 ohms, the conductor sizes required for
an adequate damping factor are rarely practical for physical and cost reasons. While it is
recommended to avoid such situations the most practical wire gauge for these situations
is 10 AWG / 6 mm
2
Loudspeaker Cable Conductor Size
NOTE:
This table is based
on achieving
adequate damping
factor (>20). The
associated, worst-
case SPL losses are
below 0.5 dB and
should be
considered
insignificant.
-- +
LF 1
-- +
LF 2
SB1000zP
S/N
WHITINSVILLE, MA US
A
Typical Barrier Strip Connector
WHITINSVILLE, MA USA
S/N
PASSIVE
INPUT
LF/HF
CONNECT
JUMPERS
FOR PASSIVE
OPERATION
--
+
--
+
--
+
--
+
--
+
BI-AMP INPUT
N/C
LF HF
MK2364
Typical Terminal Strip Connector
50 ft / 15 m
100 ft / 30 m
200 ft / 60m
> 200 ft / > 60m
50 ft / 15m
100 ft / 30m
> 100 ft / > 30m
50 ft / 15m
> 50 ft / > 15m
8 ohm
8 ohm
8 ohm
8 ohm
4 ohm
4 ohm
4 ohm
2 ohm
2 ohm
14
12
10
Not Recommended
12
10
Not Recommended
10
Not Recommended
2.5
4
6
Not Recommended
4
6
Not Recommended
6
Not Recommended
(AWG = American Wire Gauge)
Nominal Loudspeaker Z
Metric Size mm
2
AWG Size
Maximum Cable Length
10