I’m a little curious if anyone here uses these with either speaker. If you do what difference have you noticed or what does it do to change the sound ? Is it a constant battle of adjustment to the music or a dial it in and leave it set to your preferences. I have 2 units that came with the trade I did for the 4.5’s. From what I’ve read most seem to dislike what they do. Frankly I didn’t know it was an option with the 2.5 ? I’m waiting for a new preamp to come and might try one once it arrives. Anyone have one in service right now ?