Most of today’s best wireless headphones and earbuds now support LDAC, a proprietary Bluetooth codec that allows them to stream the highest-resolution audio currently possible over Bluetooth.
For context, LDAC audio files have a max bitrate of up to 990 kbps, which is significantly higher than all other popular Bluetooth codecs, including AAC (up to 320kbps), aptX Lossless (up to 420 kbps), aptX Adaptive (up to 420 kbps) and aptX HD (up to 576 kbps).
The problem? iPhones notoriously don’t support LDAC and instead are limited to Apple’s Bluetooth codec, AAC, which has a substantially lower bitrate. So, even if you buy the best noise-canceling headphones, they won’t sound as good as they could because you’re streaming music from an iPhone.
The good news? There are affordable gadgets that add LDAC support to iPhones. Like this one from Acoustune.

Superior Bluetooth
Acoustune is a Japanese hi-fi brand that’s best known for its high-end in-ear monitors (IEMs), which range from $120 to $3,300. But now the company is catering to fans of wireless audio with the ATX001.
The ATX001 is a simple Bluetooth transmitter that plugs into your iPhone’s USB-C and adds support for LDAC and aptX Lossless codecs, both of which the iPhone doesn’t natively support.





