Check the listing for details. 2 (1 PAIR) Harrison Labs FMOD 500Hz HP High Pass Subwoofer Electronic Crossover. Condition: New. Listed at 29.99 USD. 1 PAIR Harrison Labs FMOD 500Hz LP Low Pass Subwoofer Electronic Crossover Harrison Labs FMOD™ 500Hz in-line Low Pass "Electronic" Crossover/s - Made in USA SOLD AS A PAIR - search our other items if you need just 1 Many Frequencies Available - Contact us if you need help selecting the proper frequency The Harrison Labs FMOD™ is an in-line active crossover simulator. Sold in singles & pairs. FMOD's are passive so noise free & better than a much more expensive electronic crossover that requires power to operate.12dB/Octave slopeFrequencies available for every need, Subsonic filter, Subwoofer, Woofer, Midbass, Midrange, Tweeter, Super Tweeter, Horns, Ultrasonic filterCombine with other FMODs™ & traditional electronic crossovers for bandpass ranges or to change the slope and crossover frequency pointInstall in seconds by placing the FMOD™ in-line with the RCA patch cable running between the source (head unit/preamp/etc) and the amplifierLow Pass available Frequencies: 50, 70, 100, 150, 200, 500, 1000, 2500, 3500, 6500, 20KHigh Pass Available Frequencies: 20, 30, 50, 70, 100, 150, 200, 300, 500, 1000, 2500, 3500, 650024kt gold over brass construction10 volts maximum RMS inputOne-year manufacturer warrantyMade in the U.S.A