How to prevent vibration from an upright bass into the floor?
How to prevent vibration from an upright bass into the floor?
(OP)
An upright bass rests on the ground on an end-pin. When played, the body resonates, and vibrations are transferred into the floor through the end-pin. This is true even on so called "silent" electric versions. I would like to be able to practice without overly annoying my neighbors. What do you suggest?
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RE: How to prevent vibration from an upright bass into the floor?
RE: How to prevent vibration from an upright bass into the floor?
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(2B)+(2B)' ?
RE: How to prevent vibration from an upright bass into the floor?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: How to prevent vibration from an upright bass into the floor?
I'd be looking for "static deflection" of the paving slab on the rubber mounts to provide 99% efficiency for that lowest note
https://mason-ind.com/wp-content/uploads/2017/06/V...
I could not find an isolator efficiency chart in Hertz, so some cyperin' and figgerin' to convert cpm to Hz will be required.
At that point the sound waves may be exciting the floor and ceiling directly.
When young folks drive by with the sound systems in their cars on full thump some frequencies pass right thru our conventional 2X6 wood framed walls.
RE: How to prevent vibration from an upright bass into the floor?
Is the structural vibration path dominant over the acoustical/airborne path?
Can you relocate your instrument position relative to floor construction (joists)? Sometimes a few inches can make a difference or move closer to a support wall.
Be aware that vibration isolation can change the instrument sound for better or worse, change elevation of instrument, and change lateral stability of instrument.
If you want to try a low cost approach without engineering, then here a few products:
Sorbothane Material for vibration isolation and damping
https://www.amazon.com/s?k=sorbothane+feet&i=e...
Isolate It: Sorbothane Vibration Isolation Circular Disc Pad .5" (1.27cm) Thick x 3" (7.62cm) Dia. 30 Duro - 4 Pack
$53.00
From <https://www.amazon.com/Isolate-Sorbothane-Vibratio...;
Isolate It!: Sorbothane Vibration Isolation Circular Disc Pad .5" Thick x 2.25" Dia. 30 Duro - 4 Pack
$26.00
From <https://www.amazon.com/Isolate-Sorbothane-Vibratio...;
SVS SoundPath Subwoofer Isolation System, 4-Pack
$50.00
From <https://www.amazon.com/dp/B00NCSQ5GK/ref=sspa_dk_d...;
The basic concept for vibration isolation is to have the lowest possible natural frequency that is well below the frequency that is being isolated. If the lowest instrument frequency is a C-note at 130-Hertz, then the bass instrument sitting on the isolation device should have a natural frequency of about 13-Hertz or lower.
Walt
RE: How to prevent vibration from an upright bass into the floor?
My lowest note, E, is 41Hz.
Fundamentals Harmonics To
4-string Bass 41Hz-392Hz ~4kHz-5kHz
- Does your neighbor allow trial-error solutions or experimentation?
Yes, he can't stop me.
- Is the structural vibration path dominant over the acoustical/airborne path?
Structural for downstairs neighbor.
- Can you relocate your instrument position relative to floor construction (joists)? Sometimes a few inches can make a difference or move closer to a support wall.
Yes.
Question
- Besides moving close to a support wall, what other placement tips do you suggest? Between beams or directly on one?
RE: How to prevent vibration from an upright bass into the floor?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: How to prevent vibration from an upright bass into the floor?
What is largest diameter of the end pin?
How much higher than your playing position (standing or sitting) can the instrument be raised off the floor?
Answer to your last question: place directly over floor joist or preferably over vertical support column to minimize exciting floor vibration modes.
Is your apartment in a wood structure, concrete or other construction?
Walt