will
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I find that the Torii responds to EVERYTHING, for better or worse, and vibration will mush up everything including bass. Location of the feet (if you use them) makes a notable difference.
So isolating the speakers will very likely help as the floor vibrations are also getting your rack and your gear, especially if you like the "sound" the isolators make. But it would surprise me if you didn't find further improvement with good sounding vibration control on your rack and the amp. The reason I say good sounding is that different isolation and feet sound different. I have not made Archie's isolation rigs, but they make sense to me and are inexpensive. I just have a good range of isolation tools so have not built any.
Also, as posted above. OB3, OC3 and OD3 will progressively open/tighten the sound from pushing the power tubes less. This gives more spacial information from opening the sound and reducing bass power and density. Usually, these are pretty subtle shifts if you have bass issues masking the rest, but you can hear it.
I just turned off my EQ for a quick test on the Tungsol 6L6Gs Steve recommends for reducing bass. Compared to the Valve Art KT66 I have been using (more open and transparent than the warmer/deeper Genalex and the warmer Tungsol 6L6G), the 6L6G bass does sound less deep and wide. Another potential step, but not huge. Then with the bass switches back, another improvement. But for me, in my room, still dense and less resolving compared to fine tuned EQ.
I have one low going diagrammatic bass trap, but it does not quite get it in this room arrangement and I have no place for another in the living room.
Then I changed my usual OB3 to a Sylvania OC3A and put the bass switch back to the off/forward position, and that just about does it for me with the 6L6Gs, the 7C51 (OC2 type) Mazda GZ34, and Siemens PCC88 I have in. I like the richer tone this way though the bass switches "on" help reduce low bass further.
Then I put in a Mazda OD3 and like it quite a lot with the Tungsols. The bass switches off is pretty good, the OD3 also opening up the warmish Tungsols nicely.
Generally, I don't hear much boom here perse, but I get fatigue from low stuff being too strong. Without measuring, from experience this is very low bass resonance as well as low bass. By attenuating some specific frequencies (usually 45/66/ and a shelf cut around 20 Hz), the bass actually sounds bigger and does not hurt my sensitive ears. Even though my speakers are not supposed to go that low, the 25 down stuff can be really irritating to me.
Still prefer the EQ sound, but it subtly adjusts all remaining minor and more major room anomalies.
I just turned EQ back on with the Tungsol 6L6G and OD3 in and it sounds really good. Pretty similar to the more open Valve Art KT66 with my usual OB3s.
Bass traps and resonance/vibration are your primary tools, but if it is close, there are tubes.
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