Ok.
I ve got mine now and must admit it is a very good bass
I didn(t saw exactly how the preamp works but Now, I understood,
Only boost functions, no cut in this one ...
So preamp "ON" , but bass and treble OFF, you've got the sound of the bass as in passive mode.
But when you turn them, you ear the difference, and you can have a boost until +18 dB, so
is it to amplify sub-woofers ?
18 dB is too much in my Opinion, but sure you can have this wooomph under your feet if you want it !
Mine necessitated a setup, and now, it plays wonderfully, So I was thinking to resell it quickly but
maybe I will keep it a little, and maybe a lot for the future.