Definitive Technology Mythos STS Owner's Manual page 11

To prevent accidental damage to the subwoofers built into your Mythos
STSs 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.
Setting Low-Frequency Level When Using Separate LFE Input
If your Mythos STS built-in subwoofers are connected with the LFE input,
first set the bass volume level on your Mythos STSs to sound balanced when
listening to music in
stereo~
Then use your receiver or processor's Speaker Level
(or Channel Balance) menu to set the subwoofer level to at least equal volume with
the other speakers in the system. If you want more bass output on movies, you are
better off raising the .1 channel subwoofer level in the Speaker Level menu than
turning up the subwoofer volume control on the speakers.
Speaker Pre-Conditioning (Break-in)
Your Mythos STSs should sound good right out of the box; however, an
extended pre-conditioning (break-in) period of 40-60 hours or more of normal
playing is required to reach full performance capability. Pre-conditioning allows
the driver suspensions to loosen and results in fuller bass, clearer more open
midrange and smoother high frequency reproduction.
Using your Mythos STS with an
Additional Subwoofer
Although the built-in subwoofers in your Mythos STSs deliver superb low
frequency response and are all that are required for amazing performance, some
listeners with large rooms may want to add an additional powered subwoofer to
their system. If you choose to do so, we strongly suggest using a Definitive
SuperCube subwoofer in order to achieve the highest level of sound quality
possible. In this case connect the Mythos STS with the speaker wire only method
and connect the LFE output to the separate subwoofer. Your receiver or processor's
Speaker Set Up bass management system should be set to Front Speakers
=
"Large" and Subwoofer
=.
"Yes."
Complete Home Theater Systems
We strongly suggest that you use matching Definitive center channel and
rear/surround speakers to complete your Definitive home theater system. Please
note that you can use Definitive Mythos STS SuperTowers as rear or side surround
speakers with excellent results for both music and movies.