.....and of the transmission of the sound waves that impact against the arm and the cartridge and everything is amplified we want to discuss?
This also impacts the negativity of the rumble.
This also impacts the negativity of the rumble.
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.
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@atmasphere, isomerically isolated? Does that mean rubber feet? A suspension requires a resonance frequency in and around 3 Hz. Dohmann I think uses 1 Hz vertically and 1.5 Hz laterally. Put your stylus down on a stationary record, close the dust cover and turn up the volume. Then go look at your woofers. Keep an eye on the woofers as you walk around and even tap on things. With my old Sota I could hit the plinth vertically with a hammer and the woofer would not even twitch. Most woofers will be fluttering from the environmental rumble which is due to anything from the washing machine in the other room to the truck running down the street. Mass might change the amplitude a little but it will not stop it like a suspension will. How much does it really matter? Most people would never know it was there. None of us could hear it directly over the music. However if you have subwoofers and room correction with a lot of power it can cause the drivers to bottom out and can increase distortion. For me it is important because I run my subwoofers up to 120 Hz where the distortion would be obvious. I doubt any of us could hear it under 40 Hz. Of course there is the psychological benefit of knowing nothing can get to your turntable. |
I made an Isolation platform with a Butchers block at IKEA with Sorbothane pads from Amazon. You can also get wall mount turntable shelf from Amazon. I've also see people with Sorbothane turntable feet from here,
Turntable Phonograph Vinyl Record Player lsolation Feet – Mnpctech
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@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 |
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