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Comparison Ground Zero GZIW 300X-II vs Ground Zero GZIW 300X

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Ground Zero GZIW 300X-II
Ground Zero GZIW 300X
Ground Zero GZIW 300X-IIGround Zero GZIW 300X
from $159.99 
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from $86.40 up to $112.00
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Application areacarcar
DesignFreeAir (without case)FreeAir (without case)
Typepassivepassive
Size12" (30 cm)12" (30 cm)
Tech specs
Rated power350 W350 W
Frequency range30 – 150 Hz30 – 150 Hz
Sensitivity88 dB87 dB
Impedance4 ohm4 ohm
Resonant frequency30.7 Hz34.9 Hz
General
Diffuser materialcompositecomposite
Woofer Diameter300 mm300 mm
Woofer depth149 mm145 mm
Weight4.05 kg4.05 kg
Added to E-Catalogmay 2019october 2012

Sensitivity

Sensitivity determines the loudness of the subwoofer when a signal of a certain power is connected to it: with equal signal power and impedance (see below), the subwoofer with the higher sensitivity will sound louder.

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.

Woofer depth

The size of the main subwoofer speaker from the front (usually the frame protruding beyond the diffuser) to the rear edge (where the magnet is usually located). In practice, it matters when selecting enclosures for frameless models, as well as when installing Free Air (see "Design"): this is the depth to which the speaker will be "recessed" into the enclosure or trunk. And a flat subwoofer will not always produce less bass than its more voluminous counterpart.