isomerically isolated? Does that mean rubber feet?No. Beneath my platform for my turntable I have some pads made of isolation damping materials- I don't recall the material (its certainly not rubber!). A different number of the pads are used depending on the weight of the device being isolated.
How to isolate turntable from footstep shake or vibration
Even while the Oracle turnable that I use has a built-in springs suspension by design there is a low or even sub-low frequency boom every time someone walks in a room. This becomes really bad with the subwoofer’s volume set high as the low frequency footsteps make straight to subwoofer where they are amplified shaking everything around. It seems the cartridge is picking up the footsteps very efficiently as even a lightest foot down becomes audioable. What can be done to attempt to isolate the turntable from the low frequency vibrations? Interesting, that the lower the volume of the subwoofer, the less the footstep shake is evident and with the subwoofer turned off it is a barely a problem at all.
- ...
- 154 posts total
@esputnix - I searched through this thread and could not find any mention of Magnetic Feet i.e. each footer uses two magnets positioned to repel each other - the table effectively "floats". Of course there might be a reason for NOT using them i.e. "directly" on a turntable, so you might want to have them located on a secondary plinth between the the TT and the shelf Maybe combining the magnetic feet with another isolation technique would provide the nest solution? Personally, I have not used this type of foot, but considered them many years ago and thought it might be a good solution for very difficult isolation situations such as yours For more info - read this thread Magnetic levitation feet | Audiogon Discussion Forum Regards - Steve |
@atmasphere, it sounds more like damping rather than isolation although it probably isolates at certain frequencies. If you want to have some fun put the stylus down on a stationary record and hook your phono stage to an oscilloscope. Then play a sine wave sweep loudly and see what gets through. I plan on doing this with the Sota when I finally get it. |
user510, there are well designed turntables suspensions and not so well designed suspensions. Suspended turntables that have their sub chassis sitting on springs like the AR XA, LP 12 and Thorens turntables are inherently unstable and they tend to oscillate laterally when aggravated. They will skip with footfalls sometimes even more readily than unsuspended turntables. Suspended turntables that have their sub chassis hanging from the springs are inherently stable and want to maintain their resting positions. This category includes SME, some Basis and Sota turntables. They will not skip with footfalls. You can put them on a collapsible card table and they will operate fine without any audible consequence. |
@williewonka , Sitting a turntable on opposing magnets is similar to sitting a turntable on springs and would be very unstable without some kind of lateral support. Hanging a turntable from attracting magnets would be an interesting project. My instinct says it would not perform any better than hanging a turntable from springs but would be a lot more expensive. |
- 154 posts total