blackhole on obs mac

[kazary]

Greetings all . I have on imac and on macbook pro blackhole installed soi can use it as output. audio on obs . I have same settings on both .. when i record a video with obs recording options and have music coming from youtube .. the sound of music is smooth an clear on the. recorded video . But when i do same things on my. imac ... music. sound is like an old broken radio .. is not clear .. looses volume .. gets interrupted .. I have no idea why is this. as. i have exactly same settings made . Anyone could help ?thank you