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I have an airport express connected to basic (but not crappy) speakers. When I run audio directly to them it plays fine, but when I run audio from either my iPhone or Mac to the speakers via AirPlay, I get crackly distorted sound if the volume slider is above about 75%.

Does anyone know why this could be? I have the airport set to extend my current network; could that affect it?

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up vote 0 down vote accepted

Network issues only ever result in the audio cutting out, they can't really change the content.

Distortion means your speakers get overloaded. Turning down the volume is your only option.

The reason your speakers are fine on the Mac is that after the slider in iTunes the sound gets further attenuated by the system volume buttons on your keyboard. If you turn those up far enough you'll get distortion as well.

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The distortion was happening at a quite a low volume (speakers at about 50%, iPhone at 70%), also I tried to send the same audio direct from my phone to the speakers and under those circumstances I could crank the volume all the way up without any issues. –  Fraser Graham Sep 23 '11 at 14:38
    
People on the Apple Developer Forums tell me that it sounds like a faulty Digital to Analog Converter on the AirPort, I have exchanged it for a new one so I'll see if that works tonight. –  Fraser Graham Sep 23 '11 at 14:39
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