Just how loud is your music turned up when you experience the issue with your woofers? I also have Treo’s and have never had that problem. Just to confirm I just played some bass heavy Bob Marley hitting over 95 dB that I rarely do with no movement on the bass drivers.
The speakers are on a wood floor with spikes and BDR pads as Vandersteen recommends. My turntable is on a very heavy solid walnut wall unit and a Symposium platform and the Subsonic filter is off on my phono stage. No rumble detected.
The speakers are on a wood floor with spikes and BDR pads as Vandersteen recommends. My turntable is on a very heavy solid walnut wall unit and a Symposium platform and the Subsonic filter is off on my phono stage. No rumble detected.