StudioTech 233 manual Left and right channel headphone source selection settings

Figure 6. Left and right channel headphone source selection settings

The line inputs are interfaced using two connectors also located on the back pan- el. Associated with line inputs 1 and 2 are level trim potentiometers. They are pro- vided 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.

Audio associated with intercom channels

1 and 2 is provided by way of the intercom interface whose connector is also located

on the back panel. Two trim pots are associated with the intercom channels. They allow adjustment of the intercom sidetone (null) level. This impacts the amount of talkback audio signal that is returned to a headphone output when a talkback-to-intercom function is active.

The sidetone audio source comes from the output of the compressor circuit as- sociated with the microphone preamplifier. This allows an announcer or other Model 233 user to receive a confirmation signal of what is coming out of the main, and if configured, talkback outputs.

As previously discussed, each of the avail- able input sources can be assigned to the headphone output’s left channel, right channel, or both the left and right chan- nels. The Model 233’s circuitry allows any combination of input assignments to be made. For example, consider the situation where a single-channel intercom line, with audio present only on pin 3, is connected. In this case it may be desirable to assign this intercom audio source to both the left and right channels. This would entail set- ting switches SW2-4 and SW2-9 to their on positions. All other switches would remain in their off positions.

A more complex application might have a broadcast-type 2-channel IFB circuit connected to the intercom input and a line-level audio signal from a golf event “spotter” connected 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 head- phone’s right-channel output. To achieve this would require that switches SW2-3,

Issue 1, September 2007	Model 233 User Guide
Page 20	Studio Technologies, Inc.