Conqueror's X4A-1000 Run

[Shannon]

I suggest you stick with Ultrasonic and give yourself more time to acclimate to the current number of loops.  If you're going to increase, do so ONCE per usage cycle, and ONE loop up at a time.

I would but I have a roommate and we sleep in the same room. He is gone on the weekends so I can do ultrasonic but otherwise I usually do hybrid with headphones so I don't expose him. I could listen to the ultrasonic format during the day when he isn't in the room. I could still get my 4+ hours that way. What do you think?

Could also listen to ultrasonic in headphones at same volume as I do hybrid.

It is too easy to have the volume change and you don't know it with ultrasonic on headphones.  In that case, Hybrid or Masked is probably better.  Try masked, you might be surprised.  More is not always better.