Studio Technologies 65 - Manual (Page 8)

Issue 4, January 2004 Model 65 User Guide
Page 8 Studio Technologies, Inc.
for Surround
Model 65 Back Panel
Model 65 Front Panel
LFE Input
The Model 65 contains an input channel that
is specifically intended for connection to an
LFE source. To simulate some multichannel
formats, a low-pass filter can be inserted,
using a front-panel switch or remote control
signal, into the LFE signal path. The filter,
created by cascading four 2
nd -order Sallen-
Key low-pass sections, provides a 48dB-
per-octave slope with the –6dB point at
120Hz.
To allow accurate monitoring of some
cinema formats, a front-panel switch allows
10dB of gain to be added to the LFE signal.
This ensures that the proper relative level is
maintained between the LFE signal and the
low-frequency energy derived from the five
main inputs. As with the main inputs, the
LFE signal can be assigned to subwoofer
output 1, subwoofer output 2, or subwoofer
outputs 1 and 2.
Outputs
The Model 65 provides five main and two
subwoofer outputs. Each of the outputs is
electronically balanced and can be con-
nected to balanced or unbalanced loads. To
minimize the chance of loudspeaker dam-
age, power up/power down mute relays are
associated with each output. The nominal
level of the five main outputs is +4dBu,
maintaining a unity gain input-to-output
relationship. The two subwoofer outputs are
handled somewhat differently, having a
nominal output level of –6dBu. This reduced
operating level allows sufficient audio head-
room when phase coherent signals from the
main inputs are routed, by way of the low-
pass filters, to the subwoofer outputs.
±17V LED Bass management
bypass function
LFE +10dB
gain
LFE low-
pass filter
AC mains
connection
Main and LFE
audio input
connections
Remote control
and expansion
connections
Main and subwoofer
output connections