Ultra Digital DPS-2.1 Subwoofer and BASS Treble Board, DC24vTo45v Dual Supply SUB Gain Adjustable Preset Suitable Bus-Travels- Van-Vehicle-Home Frequency 30hz to 300 Hz

Ultra Digital DPS-2.1 SUB And Bass Treble Board,With SUBWOOFER GAIN Adjustable Preset for Use DC24V To 45V Dual Supply With Frequency range of 30 Hz To 300 Hz. Stereo To 3 Channel Output Subwoofer And L-R,Best Suitable Vehicle:Bus-Travels-Van-Home to and 3-channel pre-amp