For what is worth in 2014 Cirrus Logic acquired Wolfson. Thus there is no longer such a thing as Wolfson. https://investor.cirrus.com/news-an...Acquire-Wolfson-Microelectronics/default.aspx When Apple switched to Cirrus noise floor/hiss and bass roll off just disappeared from iDevices. Cirrus codecs were better than Wolfson. May be that's why the acquired Wolfson and it was not the other way around.