Figure 1 depicts the following scenario.
Tape 1 (which is the Mac Input) is set to monitor on the Tape 2 monitor output. This output means that any audio sent from the Mac to the Amp passes to the Tape 2 monitor output instead of the speakers mounted on the wall; therefore, no sound will come through the speakers.
The arrow is pointing to a part of the display that states Tape 1 is Monitoring on Tape 2.
Figure 2 shows you what the display should look like when everything is set correctly on the Amp. If you find that Tape 1 is monitoring on Tape 2, as is shown in Figure 1, tap the Tape 2 Monitor button to turn this option off.
The arrow in Figure 2 points to the Tape 2 Monitor button.
If you are still not getting audio, verify that the mute is off on the Mac. F10 will toggle between Mute and Un-Mute. F11 turns the speaker volume down, and F12 will turn the volume up.
Another item to check is the Sound Preferences setting is to the correct Output.
- Go to System Preferences -> Sound. Once you are in Sound Preferences, click the Output tab. Make sure that Internal Speaker is selected.