WOW!

All I can say is wow! This is the best piece of gear I have ever bought. It sounds amazing on the 2 bus. Exactly what I was looking for. Don't think just buy it!

Quality Stereo EQ with serious clarity

What it does is great. Hard to beat, serious. Just running audio through it brings a crispness, but not harsh. The 22hz slight bass boost is pure joy. The only thing that I'm knocking it for is that it has no HPF or LPF. But, that leaves me to drool for the BAX, so no hard feelings.

This is what I was looking for!

I had purchased the Bax EQ some time ago and all though I appreciated the high and low pass filters, It was just way to subtle and way to limited in what it does for me. This API 5500 fits my needs much better!
It's very clean and punchy and it opens up my mixes and brings them to life. If you need it to be more subtle (for mastering applications), the range control allows you to do that by cutting the amplitude by 1/2 or 1/4 increments. In addition, the controls are stepped which is also very useful for mastering apps. I also appreciate the power button being on the face of the unit as opposed to the back like the BAX EQ. You have every frequency you can think of available to work with and I think it's brilliant that the Q adjusts proportionally. In other words, With mild boost or cut you get a wide bandwith, as you increase the boost or cut the bandwith narrows.