Definitive Technology Mythos Gem XL Owner's Manual page 4

Using Mythos Gem XLs with a Definitive
Sub in Home Theater
There are many different variations of the basic Dolby ProLogic and Dolby
Digital AC-3 formats and features, as well as a multiplicity of ways in which the
speakers can be hooked up to these systems. We will discuss the simplest and most
effective hookups and adjustments. If you have a particular question regarding your
set-up, please call us.
For Dolby ProLogic
Systems
Follow Steps 1-9 provided earlier. The subwoofer will receive its low frequency
signal through the full-range speaker level outputs. If, however, your system has a
separate subwoofer RCA low level output which has a remote control level adjust-
ment, you might also want to hook this up using an RCA-to-RCA low level cable
to the LFE/subwoofer-in low level input (the lower RCA input) on a Definitive sub.
Then use your remote control sub level adjustment to fine-tune the low frequency
level for different types of program material. You might find you want a higher level
for some music or for movies.
For Dolby Digital AC-3 5.1 Systems
Please note that Dolby Digital decoders have bass management systems (systems
that direct the bass to the various channels) which vary from unit to unit. It is
absolutely critical that the bass management system be properly set in order to
achieve proper performance.
The simplest way to hook up and use your system with Dolby Digital decoders is
to hook up the left and right front Mythos Gem XLs and Definitive sub as described in
Steps 1 through 9 earlier. Wire your center channel to the center channel out on your
receiver (or center channel amplifier) and your left and right rear surround speakers
to the rear channel outputs on your receiver or rear channel amplifier (taking care that
all speakers are in phase, i.e. red (+) to red (+) and black (-) to black (-). Set the bass
management system of your receiver or decoder for "Large" left and right main speak-
ers, "Small" center, "Small" rear surround speakers and "No" subwoofer. All the
bass information including the .1 channel LFE signal will be directed to the main left
and right channels and into the subwoofer giving you all the benefits of Dolby Digital
AC-35.1.
Optional Hook-Up
An option on this hook-up (if your decoder will allow you to select "Large" left and
right main speakers and "Yes" subwoofer), in addition to the hook-up as described
above, is to use an RCA- to-RCA low level cable to connect the LFElsub-out on your
receiver to the low-level LFE/sub-in (the lower RCA input) on a Definitive sub. Tell
your bass management system that you have "Large" left and right main speakers,
"Yes" subwoofer and "Small" center and "Small" surrounds. You will then be able to
raise the LFE .1 channel level being fed to the subwoofer by either using the LFElsub
remote level adjustment on your decoder (if it has one) or the LFE .1 channel level con-
trol on your Dolby Digital channel balancing procedure. This set-up has the advantage
of allowing you to set the low frequency level on the Definitive sub for smooth
balance with music while also allowing you to ')uice up the bass" for movies with
the controls on your decoder. It should also sound somewhat better.