For anyone on an older EndeavourOS setup before Atlantis was released, but is curious to upgrade to pipewire the installation will look like this:
[scott@endeavourOS ~]$ sudo pacman -S --needed pipewire-pulse pipewire-alsa pipewire-jack pipewire-media-session
warning: pipewire-media-session-1:0.4.1-1 is up to date -- skipping
resolving dependencies...
looking for conflicting packages...
:: pipewire-pulse and pulseaudio are in conflict. Remove pulseaudio? [y/N] y
:: pipewire-pulse and pulseaudio-bluetooth are in conflict. Remove pulseaudio-bluetooth? [y/N] y
Package (5) Old Version New Version Net Change Download Size
pulseaudio 15.0-1 -5.81 MiB
pulseaudio-bluetooth 15.0-1 -0.25 MiB
extra/pipewire-alsa 1:0.3.40-1 0.00 MiB 0.00 MiB
extra/pipewire-jack 1:0.3.40-1 0.47 MiB 0.10 MiB
extra/pipewire-pulse 1:0.3.40-1 0.43 MiB 0.14 MiB
Total Download Size: 0.25 MiB
Total Installed Size: 0.90 MiB
Net Upgrade Size: -5.16 MiB
:: Proceed with installation? [Y/n]
:: Retrieving packages...
pipewire-alsa-1:... 4.6 KiB 13.3 KiB/s 00:00 [-----------------------] 100%
pipewire-jack-1:... 105.9 KiB 127 KiB/s 00:01 [-----------------------] 100%
pipewire-pulse-1... 146.4 KiB 121 KiB/s 00:01 [-----------------------] 100%
Total (3/3) 256.9 KiB 202 KiB/s 00:01 [-----------------------] 100%
(3/3) checking keys in keyring [-----------------------] 100%
(3/3) checking package integrity [-----------------------] 100%
(3/3) loading package files [-----------------------] 100%
(3/3) checking for file conflicts [-----------------------] 100%
(5/5) checking available disk space [-----------------------] 100%
:: Processing package changes...
(1/2) removing pulseaudio-bluetooth [-----------------------] 100%
Removed /etc/systemd/user/sockets.target.wants/pulseaudio.socket.
(2/2) removing pulseaudio [-----------------------] 100%
(1/3) installing pipewire-pulse [-----------------------] 100%
Created symlink /etc/systemd/user/sockets.target.wants/pipewire-pulse.socket → /usr/lib/systemd/user/pipewire-pulse.socket.
(2/3) installing pipewire-alsa [-----------------------] 100%
(3/3) installing pipewire-jack [-----------------------] 100%
:: Running post-transaction hooks...
(1/3) Reloading device manager configuration...
(2/3) Arming ConditionNeedsUpdate...
(3/3) Compiling GSettings XML schema files...
[scott@endeavourOS ~]$
Edit: pulseaudio-alsa is required by gnome-settings-daemon so if you use Gnome, make sure you don’t accidentally remove that package.