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Why the difference in SQ between different DSD LPFs?


mfsoa

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Hi Everyone,

 

I have been playing with a Rotel Michi preamp. Sounds good, built like a tank.

When I use Roon to upsample to DSD, Roon has different HF cutoff filters:

Conservative: 24KHz LPF

Recommended: 30KHz LPF

Permissive: 50KHz LPF

Unfiltered: Use with caution

 

The differences between them are clearly audible. I don't believe these 56 year old amateur drummer's ears are hearing actual changes above 30-50KHz. 

 

What am I hearing? Why the difference? Any ideas? Does DSD have aliasing that is in the audible range etc?

 

Thanks,

Mike

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ANY filter will bear anomalies. Actually the art of digital filtering is that they don't jump forward with a flavor (which is the anomaly).

On 5/30/2020 at 3:09 AM, mfsoa said:

Unfiltered: Use with caution

 

Especially "unfiltered" will exhibit anomalies.

 

You and your 56 y/o ears should seek for the most conservative filter possible. Like the one I am using myself currently : 16KHz.

 

On 5/30/2020 at 3:09 AM, mfsoa said:

I don't believe these 56 year old amateur drummer's ears are hearing actual changes above 30-50KHz. 

 

So exactly that.

And the more "conservative" the less anomaly. Mind you, in theory when all has been done right (Roon does not provide any of that).

I know you can't work with the answer for real, but still it is the answer. OK, it is my answer.

 

Peter

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