Any comments on DPA Bigger Bit DAC7 D/A converter?

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I got this baby recently. But I don't found nothing informative about it, coz the manufacturer DPA digital Ltd. was out of business.
I opned the case and found that it was made by SSA7530GP + TDA1547, a classic 1-bit chip set. After that, I plug it into my system, but it gave less significant improvement than the DAC in pioneer DVD player (DV-250), which is a BB DAC chip, PCM1742. Sigh, how disappointing it is!
I don't think this is reasonable, so I guess there must be something wrong!
Does anyone have the experience of using DPA Bigger bit DAC? Any comment is welcome.
 
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