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Iš Pioneer saito:
Ultimate connection flexibility.

The TS-W307D2 offers you a variety of set-up possibilities (4Ω or 1Ω), provided that there is correct power matching between the subwoofer and your amplifier.
So, whether you are building your system from an existing stereo or mono amp, or whether you want a basic set-up with expandability potential, the TS-W307D2 will cover common impedance loads.
The IMPP™ (Injection Moulded Polypropylene) cone is constructed from a composite blend of interlaced Aramid fibres, which make it extremely rigid; yet lightweight, for low distortion and powerful bass at high sound press levels.
The speaker terminals have been placed on one side of the subwoofer, rather than on both sides as with conventional subs; this gives you greater installation flexibility.
The TS-W307D2 is for enclosed use and is also available as a 30cm 4 Ω dual voice coil model.
Specifications

FeaturesTS-W307D2 Maximum input power1.200 W
Nominal input power400 W
Frequency response18 - 500 Hz
Sensitivity (1W/1m)89 dB
Woofer size30 cm
Woofer materialComposite IMPP™ cone using Interlaced Aramid Fibre with reinforcement arcs
Voice Coil bobbin type Phenol resin coated glass cloth bobbin
Pole Yoke TypeExtended and Vented pole yoke
MagnetsDouble-stacked
Recommended sealed enclosure24 - 49,6 litres