The classes - Card - CardPort - SourceOutput do not have the KF5PULSEAUDIOQT_EXPORT macro in the header and therefore cannot be used dynamically linked because the dynamic loader fails to find PulseAudioQt::Card::staticMetaObject for example.
Fixed. Since there were a few significant changes since 1.1.0 I've released 1.2.0 which includes this fix
You're fast. Appreciate it! :D