I've had a Fender Rumble 15 for about four years and I was getting very tired of the sound. I use it strictly for practice. I tried to get rid of it... posted it for as low as $25 on Craigslist and didn't sell. GC wouldn't give me even a lollypop for it. Then. I stumbled onto some threads by people buying Ampeg BA-108's and replacing the speaker with the Eminence Alpha 8a, which sells new for $49.99. So I could buy the Ampeg BA-108 used (about $60 if you can find it), or new ($100), and then replace the speaker (another $50). So, I ordered the Eminence and put it in the Rumble. Then I said, what the heck, I'm going to port the little thing and see what happens. So I ordered one of those flared 2" port kits from precision. After doing some calculations, I "thought" I was shooting for 45Hz... but I measured wrong... and after cutting the hole on the side I found out that the inside flare would not fit because it bumps into the speaker. So I had to extend the tube... right now it's about 11.5"... I forgot, so it's tuned to around 35Hz, if my calculations where right. (I estimated the volume of the enclosure at .574 ft^3.) I also lined some of the sides of the speaker with AC filter foam (I had some and it was a last minute decision). And if it matters, the foam is black. Ok, I put everything back together. Here's how it looks like now. Results? Less distortion. More clarity. The notes on the B string on my 5er sound better. Overall I'd say it sounds better. Before I just hated the sound going straight into the amp so I always ran a BDDI in front of it. Now I just plug straight into the amp. I's say the mod was a success. Was it worth it? Well, that's subjective. But I did learn a thing or two in the process so that was definitely a plus.