Gravity G3-15D4 15" Dual 4-Ohm Car Subwoofer 5.25 Inch Speakers Monoblock Output: A dedicated single

Monoblock Output: A dedicated single channel for powering a subwoofer system

while the tweeter high-pass filter is 4 kHz with a 12 dB/octave slope

Hi-Res AV 1

some BMW models with non-standard fixings may require the separately available APBMW A4E adapter kit

Gravity G3-15D4 15" Dual 4-Ohm Car Subwoofer 5.25 Inch Speakers Monoblock Output: A dedicated singleThe Gravity G3 15D4 is a 15 inch component car subwoofer for systems that need dedicated low frequency output beyond what full range speakers can provide. Its dual 4 ohm voice coil design gives installers series or parallel wiring flexibility when matching the subwoofer to an amplifier. This model is intended for use in a properly designed enclosure and vehicle audio system. With 1,200 watts RMS power handling and a 2,400 watt peak rating, the G3 15D4