Hi Matjet, assuming all filters and upsampling levels have been broken in with at least 500 hours on each, my observations and preferences are as follows:
* No filters and no upsampling -- impressive result per se... In the sense that in spite of the reduced treble ceiling, relatively flat stage, and a bit of "overbite" artifact, the sound is moderately pleasing.... By the way, this is aledgedly the setting "recommended" by TEAC Japan engineers.
* 2X and 4X upsampling each add progressively more top and bottom end information without adding any artifacts that I can detect. My prefered upsampling rate is 4X.... And so is the opinion of Tim Crable at TEAC America.
* FIR filters were my first try at filtering.... I found both to be limited in dynamics and staging/imaging. They also seem to have some slight problems in delivering a realistic harmonic content.... The term "slightly music synthesizerish" comes to mind.
* Slow delay 1 -- Combined with 4X oversampling it delivered the very smoothest rendition, which I could characterize as being almost tuby in nature. If a super relaxed sound is what you seek, and you do not mind a trace of pleasing euphony, this is the combination to use.
* Slow delay 2 -- In combination with 4X upsampling this is my preferred setting. The opinion is shared by Tim Crable. More extended than SDLY1, it delivers more perceivable harmonic information and micro transients, but does not cross into emphasizing leading edges or stressing the treble content. Great staging and imaging, by the way. Marvellous musical rendition.... I can relax and sink into the music for hours at a time.
* DSD -- A bit of a wild thing in my context.... Enormous amount of information, but a setting that makes me sit strait and "ready to bolt".... It sounds slightly etched, and never lets me relax and just listen to music for sake of the music itself.
By the way, use of proper PCs, power conditioner, and dedicated line are all factors that influence K-01 performance.
Lastly, K-01 with 4X upsampling and Slow Delay 2 filter has yielded the sound that I have preferred over all CD players that I have ever operated in my system.
Saluti, G.
* No filters and no upsampling -- impressive result per se... In the sense that in spite of the reduced treble ceiling, relatively flat stage, and a bit of "overbite" artifact, the sound is moderately pleasing.... By the way, this is aledgedly the setting "recommended" by TEAC Japan engineers.
* 2X and 4X upsampling each add progressively more top and bottom end information without adding any artifacts that I can detect. My prefered upsampling rate is 4X.... And so is the opinion of Tim Crable at TEAC America.
* FIR filters were my first try at filtering.... I found both to be limited in dynamics and staging/imaging. They also seem to have some slight problems in delivering a realistic harmonic content.... The term "slightly music synthesizerish" comes to mind.
* Slow delay 1 -- Combined with 4X oversampling it delivered the very smoothest rendition, which I could characterize as being almost tuby in nature. If a super relaxed sound is what you seek, and you do not mind a trace of pleasing euphony, this is the combination to use.
* Slow delay 2 -- In combination with 4X upsampling this is my preferred setting. The opinion is shared by Tim Crable. More extended than SDLY1, it delivers more perceivable harmonic information and micro transients, but does not cross into emphasizing leading edges or stressing the treble content. Great staging and imaging, by the way. Marvellous musical rendition.... I can relax and sink into the music for hours at a time.
* DSD -- A bit of a wild thing in my context.... Enormous amount of information, but a setting that makes me sit strait and "ready to bolt".... It sounds slightly etched, and never lets me relax and just listen to music for sake of the music itself.
By the way, use of proper PCs, power conditioner, and dedicated line are all factors that influence K-01 performance.
Lastly, K-01 with 4X upsampling and Slow Delay 2 filter has yielded the sound that I have preferred over all CD players that I have ever operated in my system.
Saluti, G.