Harrison Labs FMOD Inline Satellite Electronic Crossover Pr 100 Hz High Pass RCA

Works as expected, sounds good, no notes. Not a lot of options for this item but this brand seems pretty good for the price.

I like this company and their products. I have both high pass and low pass versions of this, in both 100Hz and 70Hz for subwoofer bi-amping/by-passing. Good quality product, good fit with my RCA cables and amp connectors. Small and unobtrusive. I did not do any scientific measurements on these items. From experience I know that a good quality crossover can easily cost several hundreds of dollars just in components, so... I am not sure how they pack coils, resistors and capacitors in these small devices, but they do seem to work. It sounds pretty good, and I have a highly resolving hifi system.

they can't be used as a high lvl xover, just as a preamp/low lvl. they filter everything wonderfully. they are perfect for sending a filtered signal to your mids/hi's amp. i tested them on the low lvl inputs to my receiver from the aux connection to my computer, and they performed beautifully. since they are preamp, the load doesn't matter. there was a teenie bit of distortion during the bass tones (tested with techmaster p.e.b, bass quake, etc) however with the sub present it all but cancels that out. perfect for keeping it simple stupid.

I have a pair of 6x9s in my vehicle. They sound great, but at higher volumes the bass tones seem to overwork the speakers and the mids and highs suffer. I have a sub in my system so I don't need the 6x9s outputting low frequencies anyway, and wanted to get a passive crossover to cut out the bass from them. These seem to work great. Plug right into the RCA inputs, and the low tones are cut completely out of the signal chain before they even get to the amp.

I'm using these 100Hz high pass filters with some bookshelf speakers that have fantastic highs and mids but utterly inadequate bass from their punchy little aluminum woofers that are otherwise a great match to the air motion transformer tweeters. Previously, any kind of dance music would send the woofers into full excursion. Now, with the filters installed and the subwoofer blended in, I can crank dance music at full volume, and it sounds fantastic.