Hmmm.
I use to use a Pro Jr. (same basic amp, less the reverb and tone controls). I would definitely say that another speaker will help, BUT don't bother replacing the internal one with a nicer one. ANY internal speaker in those amps will eventually cause issues like microphonics and rattling that are not good when you turn up.
What to do? I found one of those little Marshall 'micro' cabinets they made for their 'micro-stack' amps in the 80s. I lucked out, I found one made in the UK, it's red, and real cool-looking. Anyway, its' cheese-dick 10" Celestion was blown out, so I replaced it with an Eminence Li'l Buddy, a hemp-cone speaker.
No fuss, no mush. Great tone. I simply unplugged the POS internal Fender speaker (they use a 1/4" jack, but it's in an awkward place up in the chassis), stacked the Pro Jr. on top of the micro cab (almost a perfect fit), and cranked the amp. Unreal tone. I finally ditched the Jr. because of reliability issues, but I've kept that cabinet. They are back to making those micro amps again (Chinese), you can find the cabs for sale on the internet.
MUCH better than dealing with an internal speaker in those amps. Something to think about...
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