Used for a year.
Cheap product, purchased in dpart temporary solution to ...
Default: indications of approximate frquences trs.
But once calibrated (with a Clio), so good. Especially since the cuts are made without hollow or overlap.
The default cit by some about the dependency between the C-rglage down the tracks and the C-stro top of the mono subwoofer is a quality in my USGA: when I want frquence change the cut-off of my Systm, I did not touch the rglage the box, this is done alone. And when you consider that the evidence is unreliable, it is a big advantage.
Therefore dpend the intended use do.
Quality of its fit in absolute terms, given the excellent price.