Studio Technologies 65 - Manual (Page 16)

Issue 4, January 2004 Model 65 User Guide
Page 16 Studio Technologies, Inc.
for Surround
removed from the signal path. This is desig-
nated as the Flat position. Refer to Figure 4
for a detailed view of the jumper locations.
From the factory the jumper locations are
configured for 12dB-per-octave. This is
appropriate for many applications, such
as where the loudspeakers connected to
the main-channel outputs include a 12dB-
per-octave high-pass filter. (Of course this
assumes that an overall 24dB-per-octave
response is desired.) Many small amplified
loudspeakers include such internal high-
pass filters. There are also situations where
the 24dB-per-octave setting would be the
correct choice. This would be the case
where the loudspeakers connected to the
main-channel outputs do not contain integral
high-pass filters.
The Flat position is provided for special
situations. An example would be where the
loudspeakers associated with the main
channels already implement the desired
low-frequency response curve. This could
be due to the loudspeakers containing
integral high-pass filters, or to the fact
that the speaker’s inherent low-frequency
response naturally provides the desired
frequency response. To review: In the Flat
position the full bandwidth of the signals
entering the main inputs (L, C, R, LS, and
RS) route directly to their respective output
circuitry. No high-pass filtering is performed.
The key to correctly selecting the slope of
the high-pass filters is to first understand the
needs of the entire monitoring system. It’s
important to maintain a smooth transition
Figure 4. High-Pass Filter Slope Selection