@noromance props for the Quads. Have owned my pair, recently restored, since 1973.
I had a plinth like yours that was custom made in 1973 for my then new SP-10 turntable by Mel Shilling, an old time Philly audiophile who ran a shop called Music & Sound. Thing rang like a wooden bell. I kept it at a remove from the speakers, behind an alcove wall and used no special audio furniture or isolation devices at the time--there really wasn’t as much available to audiophiles though savvy DIY types may have known more. One aspect of the Quad is the dipole radiation pattern, so though your table is behind the speakers, it’s getting acoustics waves from the back of the speaker.
As to isolation, I’ve had issues with the last two houses I’ve owned, both restored, period houses with wooden floors. I was able, in the NY system, to mass load a very heavy mahogany prayer table by using chunks of sorbothane under the table legs; on top of that sat the table and HRS platform for it, which weighs 231 lbs. The prayer table was probably a couple hundred pounds. I still had footfall issues, but the table was outside of the line of fire of the speakers, in what amounted to a large,room-sized alcove.
In my new "old" place in Texas, i had a structural engineer visit for other reasons, and asked him to tell me if there was some way to wall mount 231 lbs worth of table. He didn’t care so much about the weight or mass of the table, but said the way the house was built-- all wood, including wood slat walls, they were moving, and not a secure mounting point to eliminate vibration and footfalls. I wound up buying a big Minus K. Not a bargain, but it made me a believer. There is another company that produces similar isolation devices as components- Newport?, apart from the usual suspects like Vibraplane, Herzan, etc.
One possibility -- if you change the plinth before investing in any spendy isolation products, and get the turntable out of the line of fire of the speaker forward or rear wave, you may escape without additional cost.
I had a plinth like yours that was custom made in 1973 for my then new SP-10 turntable by Mel Shilling, an old time Philly audiophile who ran a shop called Music & Sound. Thing rang like a wooden bell. I kept it at a remove from the speakers, behind an alcove wall and used no special audio furniture or isolation devices at the time--there really wasn’t as much available to audiophiles though savvy DIY types may have known more. One aspect of the Quad is the dipole radiation pattern, so though your table is behind the speakers, it’s getting acoustics waves from the back of the speaker.
As to isolation, I’ve had issues with the last two houses I’ve owned, both restored, period houses with wooden floors. I was able, in the NY system, to mass load a very heavy mahogany prayer table by using chunks of sorbothane under the table legs; on top of that sat the table and HRS platform for it, which weighs 231 lbs. The prayer table was probably a couple hundred pounds. I still had footfall issues, but the table was outside of the line of fire of the speakers, in what amounted to a large,room-sized alcove.
In my new "old" place in Texas, i had a structural engineer visit for other reasons, and asked him to tell me if there was some way to wall mount 231 lbs worth of table. He didn’t care so much about the weight or mass of the table, but said the way the house was built-- all wood, including wood slat walls, they were moving, and not a secure mounting point to eliminate vibration and footfalls. I wound up buying a big Minus K. Not a bargain, but it made me a believer. There is another company that produces similar isolation devices as components- Newport?, apart from the usual suspects like Vibraplane, Herzan, etc.
One possibility -- if you change the plinth before investing in any spendy isolation products, and get the turntable out of the line of fire of the speaker forward or rear wave, you may escape without additional cost.