Yet another pops issue (only when on Imac speakers)

This is not the cpu. This happens with a simple piano track and it happens only when I use the speakers instead of my audio interface.
Here is my aggregate device and cubase settings

If I set the device ports to Aggregate device 3 and 4, it uses my Imac speakers but there are some random ticks or pops. If I select devices 1 and 2, it uses my audio interface and everything sounds perfect.

I’m new to this so I may miss something obvious.

Hi and welcome to the forum,

Aggregate Device is not supported, because of its sync issues.