Power Mac 7200 and System 7.5.3: Sound Amplification Input Extension

I have a Power Macintosh 7200/75 which I recently upgraded to System 7.5.3. Can I use the Sound Amplification Input extension with System 7.5.3? I noticed that it is not included with the Power Macintosh 7200 series computers which have System 7.5.3 pre-installed on them.
No, the Sound Amplification Input extension is not supported when you are using System 7.5.3. If you are using System 7.5.3 on a Power Macintosh 7200 computer, you should use a microphone which supplies the proper line level signal, such as the Apple PlainTalk Microphone.

The following Tech Info Library article provides additional information about the specifications of PlainTalk microphones:

Article 15884: "PlainTalk Microphone: Specifications."
Published Date: Feb 18, 2012