Transformer Distance?

........ I was going to place it with 1" gap from each other

Yes I was going to locate the transformer in the bottom of the tower speaker,
have you changed your mind?
Was 1", now in the bottom of.

What is the maximum current flowing from the smoothing capacitors?
What is the resistance of the cables connecting the smoothing capacitance to the amplifier?
Now calculate the maximum voltage drop between the smoothing capacitors and the amplifier.
Is there decoupling fitted to the amplifier to meet transient current demand?