400W Adjustable Multi Speaker Treble/Bass 2 Unit Audio Frequency Divider 2 Way Crossover Filters Updated Version (4pcs)

I replaced the 'crossovers' in ancient 1970's era Realistic Nova 5 speakers with these -clearly a big upgrade! (Was also replacing the woofers with GRS 8PR-8's since originals had surround foam failure) My ACEIRMC crossovers have the same model# YLY-2088, but are different than what's pictured here. Mine have the input on one end the the outputs on the other end... Also no instructions available for what the 4 (all closed circuit by default) AB(bass) and CD(treble) jumpers on the boards do. I've noticed that there several other sellers with this same model# crossover, so will look for more info there. And as noted below, I took the jumper off B on 1 crossover, and that speaker sounded better than the other where I hadn't done that.

Built sturdy enough, are compact they they do work to clean up a 2-way speaker. Tested it, and it is a first order / 6 db roll off design. However, you'll get no specifics provided (no package insert / spec sheet) so you don't know what the crossover frequencies selected actually are. You play with the little caps, and Just have to judge by listening / by ear. Which is kind of a pain because it's mounted inside a box, of course. The inductor coil is in the signal path for the "bass" output, and gives a 6db roll off around 4000 Hz. On the high side. The tall blue capacitor in the path of the "bass" output seems to serve as a high-pass filter to eliminate deep bass rumbles (6DB roll off at 200Hz) and only kicks in when cap "A" is removed, otherwise it's out of the loop. It would be good use for smaller speakers or surround speakers. I don't know what the heck the idea was with with jumper B - if left on, it appears that full range goes to your woofer, though, resulting possible midrange mud, defeating the purpose of the crossover. The high-pass side for "treble" outputs have 2 capacitors (1.5 and 3.3 uF in black) that work either alone or in parallel, depending on the how the 2 jumpers are used, thus allowing adjustment of treble cutoff, which was noticeable by ear easily enough. Neat ideas for some flexibility and put into a neat, inexpensive little package, but complicated-ish and without proper documentation.

They worked for me

might work good for a set of bookshelf speakers a little to harsh for me

Does not work for bass.