Definitive Technology Mythos STS Owner's Manual page 12

Setting Bass and Treble Controls on
Your Receiver or Amplifier
Nonnally we recommend that you set the "Bass" and "Treble" controls on flat
or 0 dB. This will give you the most linear and natural sound. If you want more
bass, raise the subwoofer's "Level" control on your Mythos STS, keeping in mind
that even a little tum of the knob can make a big difference in the sound. Also, if
your amplifier or receiver has a graphic equalizer, we recommend that you leave it
flat. The reason for this is that we have spoken with many consumers about what
they thought were improperly sounding speakers when, in fact the problem was
misadjusted tone controls. When in doubt, leave them flat; this almost always
sounds the best.
Audible distortion when the speakers are playing at loud levels is caused
by driving (turning up) your receiver or amplifier louder than it or the
speakers are capable of playing. Most receivers and amplifiers put out
their full-rated power well before the volume control is turned all the way
up, so the position of the volume control is a poor indicator its power limit.
If your speakers distort when you play them loud, turn the volume down!