I have the same problem with speakers and family.... So all my listenings test have been with my HD650. And it can be pretty revealing, during some of my test I was kinda pretty worried as I heard distortion. Until I released that it was only present on electric guitars, I just haven't heard it that clearly before....
But I just got some real office space, so I now can set up my 30 years old Fane "studio monitor" style speakers, with dam1021's being used as active crossovers. Plan to also to build new speakers and new power amplifiers, see posts elsewhere....
An advantage of building and selling audio gear is that a lot of equipment now become a business expense 🙂
Please have look at: https://www.ayre.com/pdf/Ayre_MP_White_Paper.pdf
This paper shares some common opinion (single pass filtering against cascading) with this: http://www.msbtech.com/support/dac4selectManual.pdf
They don't seem to agree on "brickwall-ness" though. Ayre and John Westlake seem to prefer non-brickwall filters: pink fish media - View Single Post - M-DAC Filters - Which Do You Prefer & Why?
Here are the frequency response charts for John Westlake's M-Dac filters (look at Optimal Transient XD, John's favourite): New Audiolab DAC - Page 42
I own M-Dac but didn't test the differences between filters in detail. Difference is too negligible to worry about with my equipment.
Cheers.
Soren,
What about to try at home a a ISO X ( ISO 2969) curve into your DAC! Don't know if it is a long job for you and your tools ?
What about to try at home a a ISO X ( ISO 2969) curve into your DAC! Don't know if it is a long job for you and your tools ?
I cannot find the schematic anywhere. Is it available, at least for the output section and all optional headers pinout?
Almar if you need some parts, traffos, pulse transformers, etc, I linked here what some members described in some posts : http://www.diyaudio.com/forums/digi...oekris-s-dac-implementations.html#post4184471
I don't ask for batteries as it needs always a voltage regulator but more about a passive PS with a traffo and for example a simple resistor Pi in front of the embeded PS of the dam1021!
Would like to know also if a good DC shunt PS reg with a very low impedance at the output change something in the SQ side !
If someone have done some experiments...
Would like to know also if a good DC shunt PS reg with a very low impedance at the output change something in the SQ side !
If someone have done some experiments...
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Sebastian,
Perhaps this is in part due to the opamp output stages on the DAM1021? Your appear to have a predilection for valves and transformers, and the Monica Discrete uses output transformers and the Totaldac uses discrete class-a buffers. You might find that an output trafo adds enough of what you like?
cheers
Paul
May not be totally relevant in the context of upsampling up to 384Khz but still interesting: Inaudible High-Frequency Sounds Affect Brain Activity: Hypersonic Effect | Journal of Neurophysiology
Check fig 3 out, where
baseline = ambient noise
LCS = music with LPF at around 22kHz
HCS = music with HPF at around 22kHz extending over 100kHz
FRS = Full range spectrum
May be high sample rate/vinyl people were right...
OK I'm stopping posting about filters now because it started feeling like a monologue 🙂 My next post will be about AC vs DC power supplies 🙂
Yeah, provided you have the analog equipment capable of reproducing those frequencies...
That might very well be the case. Which is why I ended my "conclusion" post by suggesting different output stages. It's defintely on my list too.
I'm expecting the Quanghao/Andrea Ciuffoli DAC-END with Lundahls soon. Hopefully I will be able to try them on the dam1021.
On purpose I haven't bought a chassis yet, in order to keep the project open...
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I don't have any idea what analog equipment is capable of or not to be honest. The more I learn about digital, the more I worry about inadequate implementation. Sometimes I think why I don't shove a single ended tube amp up in front of spotify and get on with rest of my life. And when I'm in that financial league, put a Totaldac in between 🙂
The filters are programmable, so anything you want it to be, limited only by input sample rates....
Thanks Soekris, that was my point. The output of the dac is very dependent on the filters used. It's great that they are configurable.