[telem]

Using AirPlay2, the sound is fine on my car radio -- except when Miles Davis hits the high notes. Battery is charged and the rest of the music is fine. Same music on my Altec-Lansing inMotion3 and it's fine. Car radio is in good condition.

Why would high notes be a problem? Doesn't make sense to me.

[ghporter]

It probably has to do with how the AirPlay unit is aligned. FM works by changing the output frequency of the transmitter according to the audio input; the amount of frequency change is controlled by the volume of the input audio, and the rate it changes by the frequency of the input audio. Miles' high notes are not only pretty darn high, but both clear and LOUD-I think the AirPlay may be having problems with that combination.

Also, does the AirPlay use the line out from the dock connector, or the headphone output from the top of the iPod? If it uses headphone audio, you can probably make Miles sound better by turning the iPod's volume down and your radio's volume up. With too much input, the AirPlay could be distorting the signal-and this shows up first in the high end.

[telem]

Originally Posted by ghporter

It probably has to do with how the AirPlay unit is aligned. FM works by changing the output frequency of the transmitter according to the audio input; the amount of frequency change is controlled by the volume of the input audio, and the rate it changes by the frequency of the input audio. Miles' high notes are not only pretty darn high, but both clear and LOUD-I think the AirPlay may be having problems with that combination.

Also, does the AirPlay use the line out from the dock connector, or the headphone output from the top of the iPod? If it uses headphone audio, you can probably make Miles sound better by turning the iPod's volume down and your radio's volume up. With too much input, the AirPlay could be distorting the signal-and this shows up first in the high end.

It connects to the nano's dock connector. Would reducing the nano's output help?

[dreamryche]

Since it's connected to the Dock connector, it's most likely taking a line out, which can't be adjusted. The volume level of the iPod will only affect the headphone jack. If the AirPlay has a level control of some sort, use that.

[ghporter]

Most of the consumer FM transmitters I've seen are "idiot proof." That also means there is little or nothing the user can adjust on them, including modulation levels. You could try using a different FM channel-I've found that using a channel near one that's already in use by a broadcaster can give you noticable interference. This comes from the broadcaster being a little lax in its modulation adjustment (and in spite of FCC regulations, it happens all the time).

[spiky_dog]

bah. miles davis doesn't play that high