I was skeptical of the performance from a $200 all included unit, but was massively impressed. 25hz tune for the box is true (although don’t expect a ton out of it that low) but it really shines 30-45hz. I have this in a trunk of an old cutlass and it shakes my foot pedals. It added the missing link that my car needed and was extremely easy to install. 5 stars.
This will be the second set, im still waiting on them to be shipped with the rest of my order, but the first set i bought 6 months ago were great , im looking forward to theses one's being just as nice once they ship with my basshead garage watt meter