On 5/24/2021 8:07 PM, alien wrote:
<snip>
> I was planning to hook up my old Iphone 6s to my car via audio line in.
> I though it will make the sound much better, instead of using bluetooth.
Even without lossless compression it'll sound better via audio line in
versus Bluetooth, though I wouldn't go to "much better."
Perhaps there will now be a new run on NOS (New Old Stock) of the iPhone
6s, though it's not clear how good the internal DAC on the 6s is. ALAC
goes up to 24-bit/192 kHz, and it's highly unlikely that the internal
hardware DAC on the 6s can go up to that. You really need an external DAC.
The Apple web site states that to listen to lossless music on the iPhone
or iPad you need either a) a wired connection to headphones, receivers,
or powered speakers (using the 3.5mm headphone jack), b) use the
internal speakers (no upside to lossless audio on the internal
speakers), or c) an external DAC (plugged into the Lightning or USB
port). They also mention that lossless won't work over Bluetooth
(obviously). For the Mac the advice is the same.
For Apple TV the advice is strange. They only mention the 4K model, and
they tell you to use an HDMI cable to your receiver or TV but then they
say it doesn't support sample rates greater than 48KHz. Nothing about
older Apple TV models with TOSLINK digital audio.
Nothing said about Lightning to HDMI adapters or USB to HDMI adapters.
There are already USB-C to TOSLINK and 3.5mm DACs available for Android.
Amazon Music has been offering lossless since 2019.
Some people have used Apple's Lighting to USB adapter and then an
external USB DAC. You have to run the output of the USB adapter into a
powered USB hub and then plug the external DAC into the USB hub because
the Lightning port can't supply sufficient current for the DAC (on
Android, USB OTG has no problem supplying sufficient current). Not sure
about the iPad Pro with USB-C, but probably the hub is not needed.
Apparently some external DACs have an option for an external power
source eliminating the need for a powered USB hub, but still requiring a
power adapter.
The bottom line is that the best option for the highest quality out of
an iOS device is likely an iPad Pro and a USB-C to TOSLINK and/or analog
external DAC. Second best is a Lightning to USB dongle, a powered USB
hub with a USB-C port, and a USB-C to TOSLINK and/or analog external DAC.
Probably we'll see someone making a MFi Lightning to TOSLINK and/or
analog external DAC, but it will likely have to be powered externally.