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I've had this EQ for a while now, have had no quality issues with it. The knobs are kind of small, but then again, it's a 1/2 din sized EQ. I've run a few different setups, including Diamond Audio D6 components and subs, Alpine Type R coaxes, Alphasonik Components, an eclipse alum 12" sub, and as many as three seperate amplifiers. This really lets you"dial in" the music to your liking. It gives you WAY more flexiability than the typical 3 band parametric you get with most head units. The power plug is a little small, but manageable. The additional voltage and sub out adjustment makes a big difference for your gains on your amps. It's much easier to balance the levels and get much higher efficiency out of your amplifier(s). For the price, this is a really nice upgrade for any system. Plus the sub out 'kill' button is great if you don't need the bass (grandma, kids, etc...) in the car for the time being. 

This EQ is a must have for any bass head! Installation was a breeze. I am well impressed with the clarity in the mids and highs.... the sub control feature is awsome expecially when listening to different types of music IE..... RnB.... hiphop.... Dubstep... ex..... The only bad thing i can say about this device is.... Be very gental with the Power, Ground, and Remote ports..... Fresh out the box the screws didnt want to turn and i felt like they were about to snap off... but they didnt and all is well!

save your money. not worth it