nixos-system-config/modules/nixos/hardware/audio/default.nix

{ ... }:

{
  security.rtkit.enable = true;
  services.pipewire = {
    enable = true;
    alsa = {
      enable = true;
      support32Bit = true;
    };
    pulse.enable = true;
    jack.enable = true;

    # Reduce latency
    # https://wiki.nixos.org/wiki/PipeWire#Low-latency_setup
    extraConfig = {
      pipewire."92-low-latency" = {
        "context.properties" = {
          "default.clock.rate" = 48000;
          "default.clock.quantum" = 32;
          "default.clock.min-quantum" = 32;
          "default.clock.max-quantum" = 32;
        };
      };

      pipewire-pulse."92-low-latency" = {
        "context.properties" = [
          {
            name = "libpipewire-module-protocol-pulse";
            args = { };
          }
        ];
        "pulse.properties" = {
          "pulse.min.req" = "32/48000";
          "pulse.default.req" = "32/48000";
          "pulse.max.req" = "32/48000";
          "pulse.min.quantum" = "32/48000";
          "pulse.max.quantum" = "32/48000";
        };
        "stream.properties" = {
          "node.latency" = "32/48000";
          "resample.quality" = 1;
        };
      };
    };
  };
}