Setup of my audio devices, system-wide eq and qpwgraph

51-alsa-custom.conf

# ~/.config/wireplumber/wireplumber.conf.d/51-alsa-custom.conf

wireplumber.settings = {
  # make sure volumes are always 100% by default
  device.routes.default-sink-volume = 1.0
  device.routes.default-source-volume = 1.0
  node.stream.default-playback-volume = 1.0
  node.stream.default-playback-volume = 1.0

  # make sure no automatic change happens
  # we rely on qpwgraph and our config files for proper setup
  device.restore-profile = false
  device.restore-routes = false
  node.stream.restore-props = false
  node.stream.restore-target = false
  node.restore-default-targets = false
}

monitor.alsa.rules = [
  {
    matches = [
      {
        # match all devices
        device.name = "~alsa_card.*"
      }
    ]
    actions = {
      update-props = {
        api.alsa.use-acp = true
        api.alsa.soft-mixer = true
        api.acp.auto-profile = false
        api.acp.auto-port = false
        api.alsa.start-delay = 128
      }
    }
  }
  {
    matches = [
      {
        device.name = "~alsa_card.usb-SteelSeries_Arctis_Nova_Pro_Wireless-00*"
      }
    ]
    actions = {
      update-props = {
        # this disables S/PDIF digital outputs in system menu
        device.profile-set = "analog-only.conf"
      }
    }
  }
  {
    matches = [
      {
        device.name = "~alsa_card.usb-Solid_State_Logic_SSL_2_Mk_II-00*"
      }
    ]
    actions = {
      update-props = {
        # this enables pro-audio profile
        # without this I get crackling and random buffer size changes
        device.profile = "pro-audio"
      }
    }
  }
  {
    matches = [
      {
        node.name = "~usb-Solid_State_Logic_SSL_2_Mk_II-00*"
      }
    ]
    actions = {
      update-props = {
        # jack clients supposed to use these settings
        # however none of these work in a stable way if the card is not set to pro-audio profile
        audio.format = S32LE
        audio.rate = 48000
        api.alsa.period-size = 256
        api.alsa.period-num = 2
        api.alsa.headroom = 0
      }
    }
  }
  {
    matches = [
      {
        node.name = "~alsa_output.usb-Solid_State_Logic_SSL_2_Mk_II-00*"
      }
    ]
    actions = {
      update-props = {
        # lower driver priority node will re-sample to higher driver priority node if they are routed together
        priority.driver = 1000
        # higher session priority node will be the default node for new sessions
        priority.session = 999
      }
    }
  }
  {
    matches = [
      {
        node.name = "~alsa_input.usb-Solid_State_Logic_SSL_2_Mk_II-00*"
      }
    ]
    actions = {
      update-props = {
        # recommended source max priority is 2000
        priority.driver = 2000
        priority.session = 1999
      }
    }
  }
  {
    matches = [
      {
        node.name = "~alsa_output.usb-SteelSeries_Arctis_Nova_Pro_Wireless-00*"
      }
    ]
    actions = {
      update-props = {
        # recommended sink max priority is 1500
        priority.driver = 999
        priority.session = 1000
      }
    }
  }
  {
    matches = [
      {
        node.name = "~alsa_input.usb-SteelSeries_Arctis_Nova_Pro_Wireless-00*"
      }
    ]
    actions = {
      update-props = {
        priority.driver = 1999
        priority.session = 2000
      }
    }
  }
  {
    matches = [
      # put all the devices that you don't want to use here like the integrated audio device on the motherboard or HDMI in GPU
      # putting matches in the same scope means AND, creating a new scope means OR
      {
        device.name = "~alsa_card.pci-0000*"
      }
    ]
    actions = {
      update-props = {
        device.disabled = true
      }
    }
  }
]

eq_carla.qpwgraph

<!DOCTYPE patchbay>
<patchbay name="ardour-patch" version="0.8.3">
 <items>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="Oratory1990 HD599 EQ" port="Oratory1990 HD599 EQ:output_FR"/>
   <input node="SSL 2 Mk II Pro" port="SSL 2 Mk II:playback_AUX1"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="SSL 2 Mk II Pro" port="SSL 2 Mk II:capture_AUX1"/>
   <input node="Carla" port="Carla:audio-in2"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="Carla" port="Carla:audio-out2"/>
   <input node="Oratory1990 HD599 EQ" port="Oratory1990 HD599 EQ:input_FR"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="Arctis Nova Pro Wireless Analog Stereo [Monitor]" port="Arctis Nova Pro Wireless:monitor_FL"/>
   <input node="Oratory1990 HD599 EQ" port="Oratory1990 HD599 EQ:input_FL"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="Oratory1990 HD599 EQ" port="Oratory1990 HD599 EQ:output_FL"/>
   <input node="SSL 2 Mk II Pro" port="SSL 2 Mk II:playback_AUX0"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="Carla" port="Carla:audio-out1"/>
   <input node="Oratory1990 HD599 EQ" port="Oratory1990 HD599 EQ:input_FL"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="SSL 2 Mk II Pro" port="SSL 2 Mk II:capture_AUX0"/>
   <input node="Carla" port="Carla:audio-in1"/>
  </item>
  <item node-type="pipewire" port-type="pipewire-audio">
   <output node="Arctis Nova Pro Wireless Analog Stereo [Monitor]" port="Arctis Nova Pro Wireless:monitor_FR"/>
   <input node="Oratory1990 HD599 EQ" port="Oratory1990 HD599 EQ:input_FR"/>
  </item>
 </items>
</patchbay>

hd599-eq10.conf

# ~/.config/pipewire/pipewire.conf.d/sink-eq10.conf
#
# 10 band sink equalizer for Sennheiser HD599
# https://www.dropbox.com/scl/fi/xo3o8ge30qe23vat3ybd5/Sennheiser-HD599.pdf?rlkey=3u94biy0ewk8txko3lqs4tx0x&dl=0

context.modules = [{
    name = libpipewire-module-filter-chain
    args = {
        node.description = "Oratory1990 HD599 EQ"
        media.name       = "Oratory1990 HD599 EQ"
        audio.channels = 2
        audio.position = [ FL FR ]
        capture.props = {
            node.name   = "effect_input.eq10"
            # put this to Audio/Sink if you want to see the sink in the system menu
            media.class = Audio/Filter
        }
        playback.props = {
            node.name    = "effect_output.eq10"
            node.passive = true
        }
        filter.graph = {
            nodes = [
                {
                    type  = builtin
                    name  = eq_band_1
                    label = bq_highshelf
                    control = { "Freq" = 0.0 "Q" = 1.0 "Gain" = -5.5 }
                }
                {
                    type  = builtin
                    name  = eq_band_2
                    label = bq_lowshelf
                    control = { "Freq" = 105.0 "Q" = 0.71 "Gain" = 5.5 }
                }
                {
                    type  = builtin
                    name  = eq_band_3
                    label = bq_peaking
                    control = { "Freq" = 165.0 "Q" = 0.45 "Gain" = -5.0 }
                }
                {
                    type  = builtin
                    name  = eq_band_4
                    label = bq_peaking
                    control = { "Freq" = 1150.0 "Q" = 1.4 "Gain" = -1.1 }
                }
                {
                    type  = builtin
                    name  = eq_band_5
                    label = bq_peaking
                    control = { "Freq" = 1700.0 "Q" = 1.5 "Gain" = 3.6 }
                }
                {
                    type  = builtin
                    name  = eq_band_6
                    label = bq_highshelf
                    control = { "Freq" = 3000.0 "Q" = 0.35 "Gain" = 1.0 }
                }
                {
                    type  = builtin
                    name  = eq_band_7
                    label = bq_peaking
                    control = { "Freq" = 3100.0 "Q" = 3.5 "Gain" = -2.6 }
                }
                {
                    type  = builtin
                    name  = eq_band_8
                    label = bq_peaking
                    control = { "Freq" = 4350.0 "Q" = 3.5 "Gain" = -2.6 }
                }
                {
                    type  = builtin
                    name  = eq_band_9
                    label = bq_peaking
                    control = { "Freq" = 5800.0 "Q" = 3.5 "Gain" = -3.0 }
                }
                {
                    type  = builtin
                    name  = eq_band_10
                    label = bq_highshelf
                    control = { "Freq" = 10000.0 "Q" = 0.71 "Gain" = 3.0 }
                }
            ]
            links = [
                { output = "eq_band_1:Out" input = "eq_band_2:In" }
                { output = "eq_band_2:Out" input = "eq_band_3:In" }
                { output = "eq_band_3:Out" input = "eq_band_4:In" }
                { output = "eq_band_4:Out" input = "eq_band_5:In" }
                { output = "eq_band_5:Out" input = "eq_band_6:In" }
                { output = "eq_band_6:Out" input = "eq_band_7:In" }
                { output = "eq_band_7:Out" input = "eq_band_8:In" }
                { output = "eq_band_8:Out" input = "eq_band_9:In" }
                { output = "eq_band_9:Out" input = "eq_band_10:In" }
            ]
        }
    }
}]