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PostPosted: January 4th, 2024, 7:50 pm 
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Joined: December 14th, 2013, 2:19 pm
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Found this interesting for anyone choosing which filter to use if you have a Topping E70V. I know that several people in the group have one.

https://www.audiosciencereview.com/foru ... 88/page-59

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E70V filter-response.PNG
E70V filter-response.PNG [ 170.78 KiB | Viewed 5238 times ]


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PostPosted: January 4th, 2024, 8:17 pm 
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Joined: April 22nd, 2013, 12:58 pm
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IMHO
This is the main benefit from higher sampling rates. Lower order (slow...) filters can be used without attenuating audible frequencies.
I can think of only a very few cases where subjective reviewers have preferred the sharp (fast...) filter choice.


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PostPosted: January 4th, 2024, 8:21 pm 
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What would also be interesting is if they posted the impulse response of the AK4499EX DAC.

The first filter is a linear phase filter with pre-ringing. That does not show up in a frequency response plot. That is a non-causal filter that is not particularly good for music. The second filter is a minimum phase filter (Slow Roll-off) that is very good. The others are variants with one being a minimum phase apodising filter.

Fun with filters.


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PostPosted: January 4th, 2024, 8:47 pm 
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Joined: April 22nd, 2013, 12:58 pm
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HAL wrote:
What would also be interesting is if they posted the impulse response of the AK4499EX DAC.

The first filter is a linear phase filter with pre-ringing. That does not show up in a frequency response plot. That is a non-causal filter that is not particularly good for music. The second filter is a minimum phase filter (Slow Roll-off) that is very good. The others are variants with one being a minimum phase apodising filter.

Fun with filters.

:text-yeahthat:

The audioscience guy has a very warped and limited set of criteria for what's good and what's bad.
Frequency response isn't everything...!!


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