j313: convolver causes distortion/saturation at 100% volume level

[alxdrl]

Audio quality is degraded when volume is at 100% on my j313 (MBA 2020) compared to the listening experience under macOs.

As a reference, the piano chords in this tune at 0:53 are noticeably distorted.

• saturation remains when the bassex/bankstown node is bypassed in graph.json
• saturation reduced to an acceptable level when lowering the volume at ~80% level
• ditto when the convL/convR nodes are bypassed (while keeping bassex node)
• ditto when lowering the gain of the convL/convR nodes gain to ~0.6 (while keeping bassex node)

So maybe the IR is somehow off for j313.

asahi-diagnose-20231222-094028.txt

[chadmed]

If this is still a problem, can you try turning Bankstown down to 1.2 instead of 1.5? See /usr/share/asahi-audio/j313/graph.json.

[alxdrl]

Yeah, I think it's a bit better now.

The original video is not available any more though.

Tried this one : https://www.youtube.com/watch?v=zbUZKqo22go around 0:38 -> I can hear clear distortion/resonance on one of the chord at 100% volume, which disappears at 90% volume level.

Turning amt down to 1.2 is not much better there, only bypass helps.

Did not tried on macOS for A/B comparison.

[chadmed]

Please test the tip of main. It might not be fully gone but should be significantly diminished.

[alxdrl]

tested by copying latest firs/j313/graph.json over to /usr/share/asahi-audio/j313/graph.json then systemctl restart pipewire wireplumber : no significant improvement that I can tell.

Only bypassing or drastically reducing the the convL/convR nodes' gain really helps (around 0.5-0.6).