Cyclopse, the Delos is only my first Lyra and the bass is consistent enough to shake a solid concrete floor and for the listeners to feel it in their stomach and lungs. I set "level" VTA on my Phantom II such that it matched the setting when the stylus was resting on the gauge (i.e. using the integral spirit level.) Obviously this type of spirit level is probably only accurate to < 30 arc minutes but gives an excellent ball park indication and avoids overcooking/undercooking the VTF when we start messing around with VTA. For me it has proved indispensable.
Hope this is helpful.
Hope this is helpful.