[neonscribe]

Bluetooth audio quality, while still noticeably worse than wired connections, is much better on iOS devices using the AAC codec than on earlier codecs. Check device specs before buying. Many currently available Bluetooth devices, even some very inexpensive ones, support AAC. Use aptX on Android, AAC on iOS. If you care more about quality than convenience, use a wired connection. If you are listening to contemporary popular music with extreme dynamic range compression (not the same as data compression), you might not even be able to tell the difference between a quality Bluetooth codec and a wired connection.

[LeoPanthera]

Recent versions of both iOS and Android include an improved SBC encoder that have a perceived quality equal to aptX, so, as long as you're using a modern device, the codec quality issue is largely moot.

[romdev]

In my Toyota, a wired connection from a phone's headphone out to the car stereo aux-in sounds terrible. The amplifier in the phone just can't send a loud enough signal to compete with the noise. Even a lossy Bluetooth connection from the phone to the car stereo sounds better in this case because it's not dependent on the phone's tiny amplifier to drive 6 speakers. The Bluetooth audio quality is almost indistinguishable from the high bit-rate MP3s stored on a USB drive.

[CameronNemo]

Why is ogg opus not appropriate? Are there bluetooth accessories that support it?

[pizza234]

I'm always very skeptical of audio quality claims. Did you happen to perform any blind test? They're very surprising.