?!!! MacKenzie Music is where I bought my B12X back in the mid-2000's, so it was likely one of those you saw. It had one previous owner, an accordion player who took good care of it, and played it often over the years (decades). It still has the original C12N speaker, and was built intended more for guitar players, but it sounds great with bass. I've always played guitar through it, but recently started learning bass, and it sounds just like James Jamerson's tone - it gets THAT sound (not that I can play like old one finger Jamerson!). I'm worried about blowing the original cone C12N Jensen, so I may take it out and use it in a guitar amp, and put in a higher powered speaker for playing bass. I'm not sure what 12" speaker would be best for this approximately 30 watt amp. It's the same amp as the B15N, with two 6L6 power tubes. I'm also considering getting a 15" Ampeg cabinet for it, and leaving the C12N in the original cab - it sounds especially good with a stratocaster or telecaster, but also good with humbucker and P-90 etc. If I do get another 12" speaker for the B12X cabinet, what would you folks recommend, most of them are high-powered, and this is only a 30 watt amp. Jensen C12N is original, but intended more for guitar, although it works for bass quietly. I want to really crank the power tubes to get that great overdrive tone, so need a new 12" for its cabinet, or another cabinet for playing bass.There's a guitar store in Eugene Or. named MacKenzie music, that a few years ago had half a dozen of the oddball portaflexs'. Including the B12XT and others. They were there for several yrs., reading this thread I checked and they had all been sold.