I have stuck in a bass enhanced 4 ohm speaker to 073.
It gives a nice bit of extra bass to the loco and is handy
enough to pop in.
After taking off the bonnet section,the original speaker needs
to be taken out,and a bit of heat from the iron lets the wires pop
out handy enough.
The main problem sticking in the bass enhanced speaker is the fan plate will have to
be removed and either glue the fans on or I put a bit of brass wire accross them
as I have done,maybe there is a better way?.
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The Bass reflex speaker can be fitted too,but needs a lot more work
so this photo shows the difference in size.The speaker will protrude
into the cab,so you have to think if you want this in order to
have more bang for your buck.