beautypg.com

Headphone source selection – Studio Technologies 220 2013 User Manual

Page 18

background image

Issue 5, February 2013

Model 220 User Guide

Page 18

Studio Technologies, Inc.

Headphone Source Selection

Switch assembly SW2 is used to config-

ure the source or sources that are routed

to the stereo headphone output. The

headphone sources are IFB channel 1,

IFB channel 2, line input 1, and line input

2. The IFB channels are provided by way

of the IFB input connector located on the

Model 220’s back panel. The line inputs

are connected by way of two connectors

also located on the back panel. Associ-

ated with line inputs 1 and 2 are level trim

potentiometers. They are provided so

that audio sources with a wide range of

nominal levels can be effectively used as

cue sources. Please refer to the Advanced

Operation section of this user guide for

details on using the trim pots.
Each of the available input sources can be

assigned to the headphone output’s left

channel, right channel, or both the left and

right channels. The Model 220’s circuitry

allows any combination of input assign-

ments to be made. For example, consider

the situation where a single-channel IFB

system, with both program and interrupt

audio on pin 3, is connected to the Model

220. In this case it may be desirable to

assign this IFB signal to both the left and

right channels. This would entail setting

switches SW2-2 and SW2-6 to their on

positions. All other switches would remain

in their off positions.
A more complex application might have

a 2-channel IFB circuit connected to the

Model 220. In addition, a line-level audio

signal from a golf event “spotter” is con-

nected to line input 1. In a case such as

this, it would be typical for IFB channel

1 to be assigned to the headphone’s left

channel, IFB channel 2 assigned to

the right channel, and line input 1 also

assigned to the right channel. This would

allow both IFB channel 2 and “spotter”

audio to be heard in the headphone’s

right-channel output. To achieve this would

require that switches SW2-1, SW2-6, and

SW2-7 be placed in their on positions. Note

that using another announcer console unit

from Studio Technologies at the “spotter”

location could also prove effective. It would

provide all the necessary microphone pre-

amplifier, talkback routing, and headphone

monitoring resources.
Note that in some cases a user may wish

to wear a headset or a pair of headphones

in a left/right orientation opposite of what

is usual. In this situation the transducer

designated for the left ear would actually

supply audio to the user’s right ear, and

vice versa. A specific application where

this occurs is where on-air talent needs to

have a headset’s boom microphone come

Figure 6. Left and right channel headphone

source selection settings