Ya got me, I have seen the under dash control module with radio tubes many time.
I am not sure if the speaker is part of the big box that holds all the tubes or whether its a stand alone item. Gonna find my accessories book and see if theres a picture of it.
Found my 1933 Chevrolet salesmans data book. Says..." CHEVROLETS SUPERHETERODYNE RADIO Price $59.50 completely installed."
Shows the power head with dial, the speaker is shown on its own. I do not think I have ever seen a post or a thread on where THE SPEAKER should be located.
You might and should get an answer by posting in the VCCA CHAT , its online and specifically the 1933--1936 section after you become a member, no charge.
mike lynch