Parts Express 320-671 Variable Low Pass Filter Electronic Subwoofer Crossover Preamp Board with Gain ControlCategory: Pass Crossover BoardVariable Low Pass Filter Electronic Subwoofer Crossover Preamp Board with Gain ControlThis is the board you need to turn an amplifier or amp board into a subwoofer amp. With variable gain and low pass filter controls you adjust the cut off frequency and avoid turning up frequencies that your regular speakers are already reproducing. The preamp low-pass board requires 10 to 24 VDC which makes it perfect for car audio projects.Many home audio projects use amp boards that require 24 VDC which is a perfect match for this low pass preamp board. One power supply will run both boards without using resistors, transformers, and rectifiers.Specifications: • Power supply: 10-24 VDC • Variable crossover range: 22~300 Hz (three crossover slope examples attached at 3/4 gain) • Audio input: Mono or two-channel • Audio output: Mono • PCB dimensions: 3.06" W x 1.25" H x 0.063" D (78 x 32 x 1.6 mm) • PCB Materials: FR-4 ultra-hard glass plate • Finished board weight: 1.34 oz. (30 g) • Plate mounting holes center to center spacing: 2.75" x 0.94" (70 x 24 mm) • Hole diameter: 0.125" (3.2 mm) • Potentiometer axle center to center spacing: 1.28" (32.5 mm).Variable Low Pass Filter Electronic Subwoofer Crossover Preamp Board with Gain Control Brand:Parts Express Part Number:320-671 UPC:848864046020 Product Category:Audio Amplifier Boards & Modules Unit of Measure:EA Product Rating:(4 Reviews) Weight:0.1 lbs. California Prop 65 :Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.HighlightsVariable built-in gain control for just the right balanceVariable 22-300 Hz low pass frequency control for sound customizationWide 10-24 DC voltage requirement helps avoid multiple power suppliesPhoenix terminals make hook up easyRed LED power indicatorNOTE: PO BOX deliveries are not available.The item can't be shipped to AF, AA, AC, AE, AM, AP, HI, AK, PR in the Unite States.