![]() Lots of music apps on PC can go bit perfect via either WASAPI exclusive mode or ASIO drivers for the DAC in question but then you cant EQ. This is similar in Windows- most apps go via the Windows audio stack to the DAC- Windows resamples every sound source to the same (selectable) bit depth and sample rate then EQ software like EAPO does its thing (it might be the other way round actually) then onto the DAC. MQA decode only works in bit perfect mode too. "Bit perfect" on UAPP requires all DSP disabled. Other apps route the audio signal through the Android stack which automatically resamples to 48khz sample rate - meaning its no longer bit perfect then onto EQ apps like Wavelet. UAPP works by bypassing the Android audio stack and sending the signal (with DSP applied or not) directly to the DAC through its own custom driver. Amazon, for eg doesnt let anything other than their apps access their content. UAPP only works with selected services because that is what the services (or UAPP developers, or both) want. ![]() This can be solved by avoiding the Win audio stack (WASAPI/Exclusive) or if you want it system wide, using EQ APO However, taking Windows, when resampling signals close to 0 dBFS, there is a measurable distortion. If the DAC allows for 24 or even a 32 bit data path, the LSB is again dithered but who cares about -144 dBFS or -192 dBFS as no component in your playback chain is able to resolve this. If you have a 16 bit DAC (or you are that silly you set the OS default to 16), you have all your sources dithered and as this is the LSB, at -96 dBFS. All streams are converted to float, mixed, dithered and converted back to integer. They are designed with multiple audio streams in mind so all streams must be resampled (if needed) to the rate set in the audioo panel. If nothing is altered, quality remains the same.Īs others in this tread already pointed out, audio quality might suffer if the OS meddles with it. Bit perfect is seen by many as the holy grail of computer audio.īy sending the data unaltered to the audio device, you improve sound quality!
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