As a solid-state amplifier, featuring relatively complicated electronics, there are few popular mods made to the Mustang amps.
Swapping Speakers: Edit
While commonly referred to as "speaker upgrades", some Mustang users argue that "upgraded" speakers impart characteristics that undermine the Mustangs' ability to accurately model.
Rewiring Cab/Speaker Edit
My Les Paul forum member "NYC LP Player" shared a video on how to rewire the Mustang III's speakers to easily choose from the following options:
- Option 1 - Run any amp into the combo's speaker
- Option 2 - Use the combo normally
- Option 3 - run combo to another cabinet (ex 2x10)
Custom Cabinets: Edit
Some examples of outstanding custom cabinets made to re-house Mustang amps:Mustang III (v2) Internal Photos:
See Fender Mustang Forums' thread http://forums.fender.com/viewtopic.php?f=27&t=99362 for Thirteen (13) images posted by Forums member Patrick131184. Click on any image to access the linked image hosting site's large view of the image.
Fender Forums Thread Re: Caster Wheels For Mustang IV (v2) Amp
Image of Caster Wheels on Mustang IV (v2) Amp