Although an AV Receiver generally also has the ability to set an offset to compensate for audio delays (TVs don't).Īgain nothing would prevent Apple supporting CEC which does not have this problem.Īs a brand new Mac owner and OS X user, this was the first issue I noticed immediately after setup. This is why I believe Apple don't do it at the Mac end. As you can imagine this would make a small loss of quality and possible audio delays due to the repeated conversion. I would guess any software like AudioSwitcher is converting the sound to analogue, altering the volume, and then if needed converting the sound back to digital to send over the HDMI, and then the AV Receiver (or TV) will have to convert it back to analogue again. I believe XBMC for Mac does so but iTunes etc. However the software your using has to support this gadget. Unfortunately it is my understanding that Apple do not support the CEC standard although I have seen some people claim it 'works for them'.įor what its worth there is a USB gadget that can 'insert' CEC commands in to the HDMI signal, the computer would send the commands via USB to this gadget and the gadget then inserts the signal in to the HDMI signal. The Mac would then be telling the AV Receiver to increase or decrease the volume, this would still mean the digital signal is unchanged and the AV Receiver still gets to do it in the analogue realm. This allows sending such commands via the HDMI interface to be processed by e.g. Now what is annoying is that even with the above there would still be a way for the Mac to send the volume control to the end device using a standard called CEC (Consumer Electronics Control). The same would apply to a TV with built-in speakers. It would be able to do this in the analogue form rather than the digital form since it will already have had to convert it back to analogue to play through the (analogue) speakers. If your HDMI goes to an AV Receiver and the AV Receiver has the speakers plugged in to it, then the AV Receiver is responsible for converting it back to analogue (for sound is an analogue waveform) and therefore the AV Receiver should be also responsible for doing the volume control. the device actually outputting the sound should be responsible for volume control. Apple appear to take the view that the end-point device i.e. To change the volume of a digital signal means completely altering the digital signal. They don’t override what you choose in Sound settings.HDMI is a digital interface, when sound is sent over it the sound is therefore also digital. If you use apps that have volume controls (for example, Music or iMovie), their settings can only be equal to or less than the computer’s output volume. Stop sound output: Select the Mute checkbox.Īdjust the balance: Drag the Balance slider.ĭepending on your Mac and the devices you use, you may be able to set other volume options using the Audio MIDI Setup app. The alert volume is relative to your computer’s volume, so if you lower the computer’s volume, alert sounds also play more quietly. To set a volume for alert sounds, drag the Alert volume slider in Sound Effects. If you have Sound in the menu bar, you can turn the volume up or down from anywhere. (You may need to scroll down.)Ĭlick Output on the right, then select the device you want to use in the list of sound output devices.Īll sound output devices available to your Mac are listed, including the computer’s internal speakers, devices plugged into your computer’s sound port ( ), USB speakers, and AirPlay devices.įor any device plugged into the computer’s sound port, choose Headphones.ĭo any of the following to adjust your sound output settings:Īdjust the volume: Drag the Output volume slider. On your Mac, choose Apple menu > System Settings, then click Sound in the sidebar. Get started with accessibility features.Use Sign in with Apple for apps and websites.Watch and listen together with SharePlay.Share and collaborate on files and folders.Sync music, books, and more between devices.Make and receive phone calls on your Mac.Use one keyboard and mouse to control Mac and iPad.Use Live Text to interact with text in a photo.Make text and other items on the screen bigger.Install and reinstall apps from the App Store.
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