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Mqa claims that in old digital records adc had different filters. Then mqa say to the dac wich filter is adapted so that the dac use the same as the adc.
I agree that ideally dac should decode pcm to analog the same way that the adc encode analog in pcm.
Using different filter in adc and dac can lead to hearable differences you think?
Apodising filter claims that it adapts to the filter used on the adc.
Isn’t it clear based on everything that’s been discussed that this claim must be:
- bogus in cases where multiple ADCs have been used in a recording, and/or where a single ADC has been used multiple times (which is in fact very common, as in many cases digital recordings are run through analogue effects units in the process of mixing and/or mastering and then re-digitised)
- unsubstantiated (MQA has provided no evidence that it actually does this, and there is plenty of evidence that in fact it does not)
- even if true, irrelevant in almost all cases, since all competent ADCs use anti-aliasing filters that are transparent in the first place