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Re: Wolfson WM8740

Interesting. The Wolfson data sheet shows the de-emphasis error as -0.1 dB at 10 kHz and +0.1 dB at 20 kHz. This is quite distinct from Stereophile's measurements that showed a +0.3 dB error at 10 kHz and a -0.3 dB error at 20 kHz.

So apparently the Linn FPGA is doing the de-emphasis, and it is Linn and not Wolfson who got a bit lazy (or ran out of "room" in the FPGA) when calculating the de-emphasis coefficients. Not a big deal, as very, very few discs even use pre-emphasis, but surprising nonetheless.

I'm also a bit curious as to why they implemented their own interpolation filter at all. The one in the Wolfson can be bypassed (which apparently Linn has done), but it doesn't seem that Linn has chosen to do anything out of the ordinary with their own filter. Oh well, it apparently sounds good, and that's the bottom line.

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