Williams Sound R7-4 Installation Guide download pdf (Page 12)

In Phase

Balanced Line Using 1/4' Connector

Unbalanced Line Using 1/4" Connector

4.7 K

Source A

Source B

Connecting To A Stereo Source

STEP 4: CHOOSE AND CONNECT AN AUDIO SOURCE

Your choice of audio source can greatly affect the usefulness of your hearing assistance

system.

SIMPLE INSTALLATIONS

In simple sound systems, the best audio source is usually a Tape or Auxiliary output jack on

the system’s amplifier. Set the Audio Select switch for the type of source you have (See

Figure 6.) and plug in a suitable audio cable. If those jacks are already in use, a simple “Y

cord” can easily make the connection. See Figure 5 for use of the PPA 250’s audio cable.

ENGINEERED INSTALLATIONS

In an engineered audio system, use good wiring practice to properly connect the audio feed

as you would connect any other piece of high quality audio equipment. See the section

Avoiding Ground Loops and Choosing A Good Audio Source.

MULTI–CHANNEL SOURCES

By constructing a simple resistive mixer, stereo (or 3 channel) sources can be connected to

the T4. Additional channels can be accommodated by adding a resistor for each source.

Necessary resistors can be obtained from Williams Sound (Part Number RFC 472) or from

any local electronics parts supplier. See Figure 6.

Williams Sound

Helping People Hear

In Phase

From Microphone

3 Pin Connector

Low Impedance Microphone

In Phase

3 Pin Connector

Balanced Line Using 3–Pin Connector

3 Pin Connector

Unbalanced Line Using 3–Pin Connector

FIGURE 6: AUDIO SOURCE CONNECTIONS

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Williams Sound R7-4 Installation Guide Page 12