Comparison Alphard Magnum M15D4 vs Alphard Magnum M15D2

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	Alphard Magnum M15D4	Alphard Magnum M15D2
	from $103.22 up to $111.48 Outdated Product	from $103.22 up to $111.48 Outdated Product
all specs only differences
TOP sellers	Find prices on Amazon.uk Find prices on eBay.uk	Find prices on Amazon.uk Find prices on eBay.uk
Application area	car	car
Design	without body	without body
Type	passive	passive
Size	15" (38 cm)	15" (38 cm)
Tech specs
Rated power	350 W	350 W
Max. power	1000 W /Peak/	1000 W /Peak/
Sensitivity	88 dB	88 dB
Dual voice coil
Impedance	4 ohm /single coil/	2 ohm /single coil/
Resonant frequency	33,4 Hz	34.1 Hz
General
Diffuser material	pulp/paper	pulp/paper
Woofer Diameter	380 mm	380 mm
Added to E-Catalog	march 2016	october 2015

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.

Resonant frequency

The natural frequency of the cone in the subwoofer speaker, namely the frequency with which the cone will oscillate if the speaker is suspended freely in the air and a single impulse is transmitted to the cone (for example, by clicking on it with your finger). In subwoofers, this parameter determines, in particular, the lower limit of the frequency range (see above): at frequencies below the resonant sound power drops sharply. Accordingly, for deep rich bass, the resonant frequency should be as low as possible. This parameter is also used to calculate the size of the enclosure for the subwoofer.