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2.
You must use both coils of a dual voice-coil woofer connected
either in series or in parallel.
3.
Most amplifiers deliver exactly the same amount of power bridged
into a 4-ohm load as they do running a 2-ohm stereo load.
To design a subwoofer system that maximizes available amplifier power,
keep the following rules in mind:
1.
The total system impedance of woofers in parallel can be calculated
using this formula:
1
Impedance =
1
+ 1
+ 1
...
w
w
w
1
2
3
where w is the nominal impedance of the woofer.
2. The total system impedance of voice coils (or woofers) in series can
be calculated using this formula:
Impedance = w
+ w
+ w
...
1
2
3
The diagrams below show parallel and series speaker connections.
Figure 1: Parallel connection
RED
POS (+)
BLACK
NEG (–)
POS (+)
NEG (–)
FROM AMPLIFIER
Figure 2: Series connection
RED
POS (+)
BLACK
NEG (–)
POS (+)
NEG (–)
FROM AMPLIFIER
SUGGESTED ENCLOSURES
MoDELS
SEaLED BoX
Internal Volume
Internal Volume Qty.
MS-10SD2 SLiM
0.5 ft
3
(15L)
1 ft
MS-10SD4 SLiM
0.5 ft
(15L)
1 ft
3
– The suggested enclosure volumes are related to only one speaker, including woofer and duct(s)
displaced volume.
– For enclosures with more than one speaker, it is necessary to multiply the suggested volume and
duct(s) by the quantity of speakers.
ENCLOSURES INTERNAL VOLUME
CALCULATION INSTRUCTIONS
rECTanguLar BoX
A x B x C
Internal Volume =
1000
– A, B and C are internal dimensions.
VEnTED BoX
Duct(s) Diameter x Length
3
(28L)
1 3 in x 7 in (7.5cm x 17.75cm)
(28L)
1 3 in x 7 in (7.5cm x 17.75cm)
3
TraPEZoiD rECTanguLar BoX
(
C + D
A x B x
2
Internal Volume =
1000
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3
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