The Fiio BT11 works as advertised with iPhone 13. I feel it’s a distinct audio upgrade vs. AAC. Comparable to USB connected. I’m enjoying Sony LDAC 660Kbps at the moment. I can walk around the house with few dropouts. Darn good range. And of course take the phone with me for zero dropouts.
Current firmware has LDAC fixed at 96/24@660K. A future fw update should allow for 330K and 990K but as it is it’s a way more than worth the $40USD.
Aptx adaptive, meh, only ~250Kbps. Aptx HD works but doesn’t have the clarity of LDAC.
Nice to have a non-Android option! Not an Android-hater…my employer always provided an iPhone since the early days so that’s what I’ve used…
My around the house and yard setup consists of iPhone 13, Apple Lightning to USB adaptor, BT11 -->> Qudelix 5K, Hifiman Ananda Stealth balanced, 4V. The best ‘free to roam’ sound I’ve ever experienced.