This unit works very well to add in the diversity of an EQ to pretty much any bass. I know it says in the description that they're for EMG pickups, but in reality, there's no reason you can't use these with any pickups; it's just that the solderless connections are there to make it to use with EMGs. The boost/cut range of all the frequencies is really good, and the adjustable mids make this an even better proposition. The use of two stacked knob controls and compact size of this unit makes it easy to retrofit into almost any bass without too many modifications in terms of new holes or enlarging control cavities. My one gripe with this unit is the control knobs, which are just ugly and horrible plastic. I think EMG would be better off just not bothering to supply knobs at all. But this is a very minor blemish on what is otherwise an excellent product.