Definitive Technology Mythos Mythos STS Owner's Manual page 7

Usually if distortion is heard when the speakers are being driven
at loud levels, it is caused by driving (turning up) the amplifier too loud
and not driving the speakers with more power than they can handle.
Remember, most amplifiers put out their full-rated power well before the
volume control is turned all the way up! If your speakers distort when you
play them loud, turn down the amplifier or get a bigger one.
Setting Bass and Treble Controls on
Your Receiver or Amplifier
Normally 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 ST, keeping in mind
that even a little turn 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.
Powering Up the Active Subwoofer Section
Your Mythos STs contain a built-in, active powered subwoofer section as well
as an electronic crossover and so each Mythos ST must be plugged into an
electrical socket of the appropriate voltage (as indicated on the back of your unit)
using the plug on the end of the electrical cord which you have attached to the
speaker through the hole at the bottom of the base. The Mythos ST has a special
circuit which automatically turns the powered subwoofer section on when a signal
is fed to the loudspeaker and does not require an on-off switch. Please note that if
you hear a pop from the speaker when the amp powers up, this is normal. The
LED on the back panel will light up when a signal is sensed and the amplifier turns
on. Please note that after the cessation of a signal, it may take up to an hour for the
amplifier to actually turn off. In some instances, because of RF presence in your
area, the LEDs may not turn off. However, this is nothing to be concerned about as
the amplifiers draw almost no power when they are idling.
To prevent accidental damage to the subwoofers built into your Mythos STs
from overdriving the system, the subwoofers feature an internal overload
protection circuit, which will turn the subwoofers off or down when
overdriven or overheated and will then resume normal operation after a few
minutes.
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