I was an applications engineer for Avnera for 3-1/2 years, and yes, their chips are quite good. They have a few different product lines that support anywhere from 16b/48k stereo to 8 channels at 24b/96k. They've gone to great lengths to ensure robustness in the presence of interference, and some of their stuff is quite highly integrated (radio, DSP, microcontroller, audio codec, audio amplification, power management, battery charging, UI, in an 8X8 QFN).
That said... You won't find their chips available anywhere, because they sell exclusively to very large companies (Logitech, Belkin, Vizio, Best Buy, etc.) and their ODMs. You *may* be able to buy their modules through the secondary market. I think a better solution from an availability standpoint is TI. --Ward
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