Has anyone run these on a pair of active monitor speakers to remove the extreme low end? Like for 4" bookshelf speakers? Did it color the sound?

I use them on a pair of 5" active studio monitors. The sound is not colored, they removed those low frequencies that caused the extensive woofer movement and "bottoming out" of the woofers. I did add a subwoofer to the set to make up for the lost low end below 100 hertz. Actually I am impressed by their performance. Don't forget the connectors you will need to use them.

Are these good to get rid of engine noise in my door speakers? Thanks

Antonio assuming you're using these on the signal inputs of a car power amp, they will remove all low frequency sounds below 100 hz. That would remove most of the low bass notes from your music. Engine noise is more likely to be an issue of cable shielding and/or grounding of devices.

When plugging them in, are these directional?

I didn’t see any indication of direction on them. The direction I’m using is source audio plugged into the female side, then make side plugged into amp. I haven’t tried the other direction.

Cheap active sub no crossover, running off line out of power amp. Do I need high or low pass 100hz to cut off all signal above 100hz?

Running it off a power amp - yes you do, otherwise you'll get the sub trying to reproduce the whole range; 100hz low pass (black writing filter will work (FMOD Crossover Pair 100 Hz Low Pass ).

Fmod Crossover Pair 100 Hz High Pass

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Description

🎧 Elevate your sound game with precision and style—because your audio deserves the best.

PREMIUM BUILD QUALITY - 24kt gold over brass construction guarantees superior conductivity and long-lasting reliability.
EFFORTLESS INTEGRATION - Plug-and-play inline design installs in seconds between source and amplifier—no power needed.
PRECISION AUDIO CONTROL - 12dB/Octave slope ensures clean, noise-free frequency separation for pro-grade sound clarity.
VERSATILE FREQUENCY OPTIONS - Choose from a wide range of high and low pass frequencies tailored to your exact audio setup.
MADE IN THE USA WITH WARRANTY - Backed by a one-year manufacturer warranty, crafted domestically for trusted quality.

The FMOD Crossover Pair 100 Hz High Pass is a passive, noise-free inline active crossover simulator designed for professional audio setups. Featuring a 12dB/octave slope and premium 24kt gold over brass construction, it supports up to 10 volts RMS input and offers a variety of frequency options. Made in the USA and backed by a one-year warranty, it installs effortlessly between your source and amplifier to deliver crisp, clean sound separation without the need for external power.

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AED 200

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FMOD Crossover Pair 100 Hz High Pass

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