Upgrading Speaker in a Yamaha S4115H PA Cab

[Bart277]

Hi as well as other speakers I run a pair of Yamaha S4115h in our front of house.
I have been thinking instead of buying new cabs just upgrading the 15" 120w Yamaha speakers with something with a bit more grunt. Can anyone tell me what is a good replacement PA speaker for the 15" and will it match up with the horn already in the cab?
Thanks

 

[Keithwah]

Probably the most affordable replacement drivers of decent quality out there. And they are very cheap compared to name brand drivers. Replaced the JBL 15's in some MR series boxes a few years back. Almost doubled the handling capability of the system.

 

[uhdinator]

putting a speaker in a box that it was not designed for will give you bad results.
The internal space/volume of the cab is matched with the speaker to give a certain
response. You throw a speaker of higher power that has more travel/displacement of air
and the freq response of the cab will change too.