I was looking at the specs for the Rumble 100v3 recently, and I had a cool idea for a mod inspired by the
@DukeLeJeune 's AudioKinesis Birdhaus 4x6 (now discontinued). I hope you don't mind Duke!
I've noticed that quite a few TB'ers report good results from swapping out the speaker (most commonly for an Eminence BassLite or DeltaLite), and it occurred to me that the Rumble 100 would be a good candidate for the Faital Pro 6FE100 driver--times four that is. For those that aren't familiar with the Birdhaus cabs, the Birdhaus 46 used four 6.5" drivers with an unorthodox alignment: two speakers stacked vertically in the front and one more on each side. The result is excellent dispersion of the sound across the entire stage/room. The 6FE100 is an 8 Ohm driver, so wiring in a series/parallel combination results in a nominal total load of 8 ohms, which matches the original 12" Rumble driver.
The Rumble 100 is a looks to be a bit larger than the Birdhaus 46, which will result in more low end but less power handling. This trade-off may be of particular interest to 5-string players as the Birdhaus 46 reportedly has a bit of a week low B-string response (-6db at 62 Hz). This also seems like a worthwhile trade off given the 100W power rating of the Rumble.
Specs for the Birdhaus 46:
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At $42/speaker and Rumble 100s going for $300 or less, this mod isn't too expensive either.
"FaitalPRO 6FE100 6" Professional Midrange Midbass Woofer 8 Ohm" from www.parts-express.com!
I'm afraid I have neither the time, funds, or need to pursue this right now, so I hope it'll be of interest to some here. There are definitely other combo amps out there that would also be decent candidates for this mod, but given the price, size, and weight (22 lbs for a 1x12" is pretty svelte!) of the Rumble, I think it's the best candidate. I'll try to update this soon with some details from some modeling software. I'm not sure about the optimal port tuning, but my first impressions from running a few quick models is that there is a wide range of acceptable port tuning. Could be a good candidate for multiple pluggable ports--another of Duke's innovations I'm, uh, assimilating.
(The GK MB112 was my other candidate, but it's pricier, heavier, and it's built in speaker is 4Ohms, so you'd only get about half of it's 200W rated power. The one advantage I could see is that you could add a speaker out to the GK and drive an external 8 ohm cab).