Comparison Alpine SWR-8D4 vs Alpine SWR-8D2

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	Alpine SWR-8D4	Alpine SWR-8D2
	from $249.95 Outdated Product	from $110.40 up to $132.80 Outdated Product
all specs only differences
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Application area	car	car
Design	without body	without body
Type	passive	passive
Size	8" (20 cm)	8" (20 cm)
Tech specs
Rated power	350 W	350 W
Max. power	1000 W /Peak/	1000 W /Peak/
Frequency range	30 – 200 Hz	30 – 200 Hz
Sensitivity	88 dB	88 dB
Dual voice coil
Impedance	4 ohm /single coil/	2 ohm /single coil/
Resonant frequency	36 Hz	36 Hz
General
Diffuser material	pulp / paper	pulp / paper
Woofer Diameter	200 mm	200 mm
Woofer Depth	115 mm	115 mm
Added to E-Catalog	march 2014	march 2014

Impedance

The electrical resistance of a subwoofer when a signal is applied to it. This parameter is important primarily for selecting a subwoofer-amplifier pair: at a lower impedance than that of the amplifier, the subwoofer will distort the sound, at a higher impedance the sound will be too quiet.

For dual voice coil models (see above), the impedance is specified for one of the voice coils.