Ayien, that's normal for onkyo, i have ds797 and I asked same question before. If your 600 setup menu is almost same as mine, you can actually set the volume meter in db also like denon, just go to menu #4 preferences and then volume and then set the meter to I think "Absolute" and the default is "Relative" (or the other way around, i forgot) anyway just select the next option from the default. Enjoy!!!