The model and render of this harman/kardon speaker is done with rhinoceros (i didnt use any plugin). I modeled it complitly based on nurbs .
Render device: GTX 1070
Response: sharper start
I cant remember render time , but approximatly 10 minute
that is pretty clean, i am not sure did you use cycles or a different renderer?
I always use the rhino default motor engine
awesome work!! thanks for sharing!