Studio-technologies 65 User Manual download pdf (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

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