Commentaire officiel

@Jon > Are you running the audio to a stereo amplifier or other device that may have audio processing like Dolby or THX? Some of those speakers can delay the signal so if there is a "direct" or "aux" mode, that can bypass the processing and negate the delay.
@Julio > No, I think any BT4 will work, any iPad or iPhone back to the iPhone 5S era.