Philco 60 restoration

[polyphase]

Originally Posted by Reece

I'm always harping on this, but I would put a plywood bottom shelf under that speaker all the way to the back of the cabinet to enclose the bottom of the speaker compartment. The way they made them there's an acoustic short circuit from the front to the back of the cone: result, less bass.

I have to agree with this. A 250Hz tone has a wavelength of about 4ft, so at least a partial acoustic short circuit would exist here, right in the critical lower midrange. 100Hz material, if deliverable from this set (I suspect it is), would pretty much be cancelled out.