[Convolver]

I would also love to see convolver support in Poweramp, since this opens up the use of corrective eq for individual headphones to get a reference frequency response (Viper DDC/IRS), which I think doesn't need to happen on a system level, but only when listening to music.

Another suggestion would be to open up a option to reorder different DSPs, for example on devices with sufficient cpu power, having sox resampler resample to 96k before engaging in a convolver, eq and such would be beneficial to quality, 

[List of Android Devices with Hi-Res Audio Support (Internal DAC)]

8 hours ago, maxmp said:

Unfortunately, Z3 will resample to 48khz anyway. There is only one DAC clock, so it works on multiples of 48khz, always. (Then delta-sigma DACs will oversample to very high frequency and quantize all those 24/16bits to 1bit).

Android audio system, though, can work on 44.1 or 48khz, so no resampling will happen in Android in this case (but it will still resample on lower levels to DAC 48khz). It's debatable if Qualcomm DSP resampling is better/worse vs Android resampler.

From this info I am extrapolating that the best setup is then

Poweramp v3 -> sox 44.1k to 96k -> hi-res 24/96 (pushes aliasing / low pass filter artifacts further up the freq spectrum) -> (Android sound layer, or is this bypassed?) -> Qualcomm DSP delta sigma

Since I also have alsa with a good quality resampler (not as elaborate as sox, but better than Sony stock implementation) running in the background to handle non Poweramp audio, if Poweramp hi-res does bypass this layer, I can leave its setting at 48k without fear of going from 44.1 to 96 to 48.

[List of Android Devices with Hi-Res Audio Support (Internal DAC)]

Played with quite a bit of hacks in mixer_paths and audio_policy on the Sony Z3 Tablet Compact (pretty much hardware to Z3), and finally got Hi-res to work.

Now the device plays 24bit/44.1khz flacs without going to 48khz system sample rate. DVC is mandatory, and disabling DVC forces Poweramp to fall back to OpenSL ES.

audio_policy.conf

mixer_paths.xml