Very clean sounding. Very well built. Can build crossover module for any frequency you want.

Crossover modules are a bit of a pain to take out if you dont have a chip puller. Those little prongs are easy to bend without the right tools, but equally easy to bend back. The little plug module for the power and ground on mine is falling apart and sometimes comes out of the socket. But with the way this thing was taken care of, I wouldnt be suprised if the plug was made of that indestructable black box stuff and still falling apart.

Excellent crossover. Very versatle. Can build a module for any frequency you want, unlike many crossovers that are adjustable only to certain ranges. Bravo. Audio Control customer service is excellent too. The are quick to respond, a few hours for an email response. A soldier joint came loose on mine (The thing is many, many years old, I bought it used, and it looks like it has been to hell and back more than a few times) and they offered to fix it for free without proof of purchase or anything, even though the source of the problem is obviously abuse.

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Nothing comes close. Period.

Great sound. Can't get better.

The chips

I like the 4xs. It's clean and sounds great.
their's not much too say it's the best out their.

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Their is none

Awesome quality

crsoosover point filters don't coincide w/ standard resistor values in alot of cases so you have to use odball points like a 71.5K resistor makes for a crossover point of 100.6993 Hz

Killer 4 channel crossover

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Nothing is as flexible as this is

Great filtering and noise reduction system

You have to remove the top cover to change resistor modules if needed.

Great quality product. Great reliability since it has been constantly working for 5 years. Ease to connect is great.

The 4XS is a great product, it has a nice steep 18db/octave crossovers and can be configured to a steeper 24db/octave. All the crossover points can also be reconfigured to your likings.The PFM feature which is a subsonic filter is also very very useful. Great product!!