Anything that moves your stylus/cantilever will translate to speaker movement. That's always been a factor with turntable/cartridge systems. If you can find a record clamp or weight that will take out some of the warp, it will help. Hopefully you're not using any kind of bass boost or "loudness" control in your listening. If the speakers don't exceed their linear range, or bottom out: there shouldn't be any damage to the system. With regard to your tonearm/cartridge resonance: 8hz is above record warp freq., and below audibility(close to the lower end of ideal). For more insight: (http://www.gcaudio.com/resources/howtos/tonearmcartridge.html) If your house is of frame construction: mounting a turntable platform to the wall is not a great idea.