Originally Posted by regal
The usual complaint about the DF1704 is the slow roll-off mode isn't slow enough and should have been pushed to a higher -3db point. From what I understand about the PMD100 is PM used a unique technique to minimize phase distortion. If you survey the old digital experts most will say the best digital filters made were the SM5842 or the PMD100.
You are right, many people seem to favor the PMD100 over other digital filters. Pacific Microsonics did a lot of psychoacoustics research before releasing it. It is really sad that more than 15 years later, most buil-in digital filters do no come close to the PMD100 (or even the DF1704 for that matter).
Anyway, I brought up the subject of digital filters so that people understand the effect of a low jitter sources on their converters.
When using a high jittery source, a lot of distortions and nastiness of the digital filters are masked/blured by the noise.
When using a low jitter source such as the hiface, there are improvements in many areas but it can also reveal/expose any flaws elswhere in the system.
(BTW, not high jittery sources have pleasing distortions, the emu 0404 usb is edgy sounding).
Doing tests with 24/96 source material will minimize the effect of the digital filtering and will probably allow for better comparisons of the intrinsic quality of different converters. If listenings tests are done at 16/44 on an average sounding digital filter, the tests won't reveal much and thy would be specific to that specific type of DAC implementation.