JBL MS-10SD2 SLIM Suggested Enclosures, Enclosures Internal Volume, Calculation Instructions

2. You must use both coils of a dual voice-coil woofer connected

either in series or in parallel.

ENGLISH

SUGGESTED ENCLOSURES

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:

MODELS	SEALED BOX
	Internal Volume
MS-10SD2 SLIM	0.5 ft3 (15l)
MS-10SD4 SLIM	0.5 ft3 (15l)

VENTED BOX

Internal Volume	Qty.	Duct(s) Diameter x Length
1 ft 3 (28l)	1	3 in x 7 in (7.5cm x 17.75cm)
1 ft 3 (28l)	1	3 in x 7 in (7.5cm x 17.75cm)

1.The total system impedance of woofers in parallel can be calculated using this formula:

Impedance =			1
			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

Tthe diagrams below show parallel and series speaker connections.

Figure 1: Parallel connection			Figure 2: Series connection
RED			RED
POS (+)	BLACK		POS (+)	BLACK
	NEG (–)			NEG (–)
	POS (+)	NEG (–)		POS (+)	NEG (–)
	FROM AMPLIFIER			FROM AMPLIFIER

–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			TRAPEZOID RECTANGULAR BOX
	A x B x C				C + D
Internal Volume =				A x B x (	2 )
1000			Internal Volume =
		1000

– A, B and C are internal dimensions.

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