Installation manual

Page 22
Setup 1 - Speaker Size & Crossover Frequency
The Cinema Rhapsody Mach 4 uses the description of Small (SM), Large (LG), and None (NO) with
respect to the speakers. Small refers to speakers that are not designed to handle low frequencies.
Bass information is redirected to the subwoofer. Large refers to speakers that are capable of playing
low frequencies and typically, no bass redirection takes place. None refers to that speaker not existing
in your system (i.e. no back-center surround speakers)
There is another Cinema Rhapsody Mach 4 feature that works in conjunction with SMALL settings
called Sub Crossover (SUB) which refers the Sub Woofer crossover frequency point that determines
at which frequency the Small speakers’ bass information is “rolled off” and sent to the subwoofer.
Speakers that are set to Large are only rolled off if the Advanced Speaker Option is Enabled. The
crossover frequency point is fully adjustable per speaker group on the Cinema Rhapsody Mach 4.
Speakers are grouped together accordingly: Front Right & Left, Center, Surround Right & Left, Back
Surround Right & Left, and Subwoofer.
THX Rated or Small Speakers
If you are using THX speakers, most such speaker designs are purposely engineered to not handle
low frequencies because the subwoofer is providing all of the bass sound reinforcement. The typical
crossover frequency point for THX speaker is 80Hz (Hertz). In a THX speaker system, all bass infor-
mation below 80Hz intended for the left, center, right, surround left, surround right, back surround left,
and back surround right speakers is redirected to the subwoofer and summed (combined) with the LFE
(Low Frequency Effects or the “.1” in a 5.1 mix). As such, these speakers are rolled off at 80Hz.
Full Range or Large Speakers
If you have a mix of home theater speakers and full-range speakers (speakers that can handle bass),
you can opt to set some speakers to the Large setting and other speakers to the Small setting. Typi-
cally speakers that are set to Large do not have any of their bass information sent to the subwoofer.
However with the Cinema Rhapsody Mach 4 which features a second analog crossover, you can run
speakers full range while still extracting the bass information to the subwoofer - the speaker most likely
best capable of producing low frequency sounds.
Advanced Speaker Option
The Advanced Speaker Option can only be
engaged using the PC program. To turn on the
Advanced Speaker Option, click the check box.
For speakers that are going to be set to Small,
ADA suggests setting them small in the DSP’s
crossover and Large in the analog crossover
(Advanced Speaker Option). For speakers that
are going to be set to Large, they should be set
to Large in both crossovers.
Once you have set your speakers up, you have
to turn on Sub Summing. Here you also have an
option of boosting the sub input level by 10dB.
Because all adjustments made here occur in real-
time, ADA suggests listening to material as you
make these adjustments.
The four Speaker Presets store settings all these
settings including speaker sizes, crossover points
and Advanced Speaker Options.