A shelf to absorb vibrations? - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 26 Old 01-28-2019, 10:45 AM Thread Starter
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You never did say just what tracking force you had on the tone arm. That makes a significant difference.
Everything on the player was setup and adjusted by a local shop owner, I trust his knowledge more than my own on record players. And I feel the tracking is fine, I'm not sure what the counter weight is set at off the top of my head.

I wouldn't call myself an audiophile, but I'd say I'm pickier than the average consumer. I waited a long time to get my B&W speakers, only to now have a dent on the corner of one of them because the stupid cat knocked it over. Now my brother-in-law, he's got a VPI player, 10x more than what I'd spend. But he makes a living as a jazz musician.

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The floor joists were 6 to 8 oak logs, with the bark still on them
That's crazy. Mine are your regular 2x8, which I sistered a few of them up to repair some old water damage. At the other end of my house was an addition off the kitchen which I'd estimate was built in the 50s. I had to rebuild that room almost from scratch (actually that would've been easier). Half the joists were cracked or broken from termite damage and the foundation had sunk a bit, which I jacked up the room 2". Nevermind the fact there was a beheaded clown under the floor and no vapor barrier over the dirt.


I did come up with an unusual idea, not sure if it'd work. I'd have a board with a magnet on the bottom at each corner. There would be a pillar at each corner to act as a guide to keep the board in place. These pillars would then be attached onto another board with 4 magnets on the top, opposite of the other board so they repel. The idea is a magnetically suspended shelf. No idea how strong the magnets would be or how stable it would be, but it sure would look neat!
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post #22 of 26 Old 01-28-2019, 11:39 AM
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What does the shop owner say about your issue?
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post #23 of 26 Old 01-28-2019, 01:15 PM
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Yes, the shop owner is the one that needs to be addressing this problem. You cannot solve record player problems unless you know how that record player is set up. The tracking weight may be set so light that the head bounces with the slightest amount of vibration. Even though it may be set for 2 or 3 gram, you may have to set higher to solve your problem.


Get the shop owner to show you how to adjust. You may have to buy a scale.


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post #24 of 26 Old 01-28-2019, 02:32 PM
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What is the total span on those 2x8s between supports?
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post #25 of 26 Old 01-29-2019, 01:00 PM Thread Starter
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I think maybe 12' span at most. I figure the stylus is set up light because heavier weight can wear down on records harder.
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post #26 of 26 Old 01-29-2019, 04:03 PM
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2x8 joists set 16" OC have a max. span of 12'. Given it's an old home and load on the floor may be greater now, you may well have some sponginess in the floor. My new home has a max. floor joist span of 12' with the 2x10 joists on 16" centers and every third joist doubled. There are some load bearing joists that are tripled gluelam joists where there is extra weight above the floor. I'd say the best fix for your vibration is to sister in a couple of additional joists under the area where the turntable sits. If that's not an acceptable solution, the sponge/springs sub structure is your only thing to try if increasing the tone arm weight is unfavorable because that floor is going to continue to bounce until it is made stronger.

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Last edited by Jim Frye; 01-29-2019 at 04:06 PM. Reason: added text
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