Is symphonic music kind of like Phil Spector got hold of chamber music?

The Classical forefathers are turning in their graves.

Expand your musical horizon.

I think that's an amusing concept! 😄

I’ll abstain from personal judgment, but I think that another way of saying what I think you are trying to say is “orchestral music is to chamber music what Phil Spector (and his *wall of sound*) is to (most) Rock & Roll”.  There is some truth to that, but so what? 

Symphonic music has a wider tonal pallette than chamber music. Plus greater spatial effects.

Kinda like that but symphonic music came along way before Phil Spector. So it’s more like Phil Spector is like symphonic music got hold of Robert Johnson or Louis Armstrong or Billie Holliday or Bob Dylan.