Although Mike Kruckenberg preferred the sound of his SoundDock to the iPod HiFi, he was disappointed that it didn’t feature an auxiliary input ... only has a line-in jack.

Why auxiliary audio inputs haven’t been standard ... you’ll need to buy an entire upgrade package just to get an audio jack on the dash. [Jon W’s] Hyundai Sonata didn’t have that bells ...

Not that long ago, you’d need to pair via Bluetooth, find the right USB port, or even send audio through the car’s 3.5mm auxiliary input ... to the headphone jack of your smartphone.

Typically refers to input sockets that go to the head unit in a vehicle. The analog AUX jack enables any music player to play back through the vehicle's speakers, while the USB port allows music ...