True wireless headphones can now receive CD-quality music, thanks to significant advancements in Bluetooth since its inception. In some models, it, paired with noise isolation, echo reduction, and active noise cancellation has resulted in excellent sound quality in wireless headphones. Top headphone manufacturers are now split on which sound format should be used; Qualcomm's default is AptX HD, Sony recommends LDAC, and Apple uses Bluetooth AAC encoding. Also necessary is integration with your smartphone.