Check the listing for details. Crutchfield 150Hz Bass Blocker pair. Condition: New. Listed at 9.99 USD. Product highlightspair of inline high-pass filters (150 Hz cut-off) handle up to 50 watts RMS 6 dB per octave roll-off warranty: 1 year What's in the boxTwo 150Hz bass blockers (attached 6" speaker wires on either end terminated by male and female quick-slide connectors) About this itemWritten by Crutchfield's Alexander H.Eliminate bass distortion in your speakers Protect your new car speakers from bass distortion and enjoy cleaner sound with Crutchfield's Bass Blockers. Each Bass Blocker handles up to 50 watts RMS with a 6 dB per octave roll-off. Here are some general guidelines for matching Bass Blockers to speaker size. Speaker Size Cut-off Frequency 6-1/2", 5"x7"/6"x8" — 150 Hz 5-1/4" — 300 Hz 3-1/2", 4", 4"x6" — 600 Hz These models come fitted with easy-to-use quick-slide connectors that make installation a cinch — no splicing or crimping needed. The listed cut-off points are at 4 ohms. If you use 8-ohm speakers, the cut-off point is half the listed frequency. If you use 2-ohm speakers, the cut-off point is double the listed frequency.