My Tubeworks RT-3300 did not sound anything like my Ibanez Promethean P500h, and neither of them sound like my Genz-Benz Shuttle 6.2 through the same cab with the same bass. That's my own research and conclusion.
No, that's not what the video says. Jim's point is when you dial in each amp so the frequency response is flat, then they will sound identical through the same speaker cabinet. Otherwise, each amp has its own sound because the tone stacks and associated speaker cabinets are different. That doesn't mean all amps are identical. It means find the flat settings on your amp so you can learn how the tone stack works and dial in your sound more easily.
Except that in many cases, it's not possible to adjust the amp for "flat response". This is a guy taking a semi-valid "theory" and then extrapolating to a false conclusion. This is especially true when you take the generation of harmonics and texture into account.
And he just happens to have all of those amps with their very particular features so he can record them to set up rhetorical questions about how things sound, based off of audio replays on YouTube. The setup seems kind of like a humble brag/flex.
Two different amps on identical cabinets. They're both excellent but they clearly sound different. No matter how I try I cannot get them to sound identical, and that's a good thing.
Same here, I have three different amps (GK MB500 Fusion, Aguilar TH500 and Genz Benz Shuttle 6.2) and all of them sound different then the others...
Agreed! I have the identical cabs, and a TT-800 and LMIII. Both heads have very unique tonal palettes, which is why I keep both around. As you and I are nearby, may all four cabinets together would make them sound the same?
Anyone who's been playing a long time knows that each one of us has, almost at a DNA level, a tone from the back of our mind we need to sound like. THAT's what's going on. Put me in one of those rooms with all those different rigs with a bass and a cable, give me about five minutes on each one, and owing to some differences in the amp topology and the difference in cabs, I'm gonna sound like me on each one as I work through them. You will too.