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This is a form of mass loading, a type of vibration control. Nothing special, just solid mass. Looks better than a phone book, one of the first I tried 30+ years ago. That's how old this is. You can try a book, dive weights https://systems.audiogon.com/systems/8367 lead shot, granite, butcher block, sand bed, literally anything with mass. Not all materials sound the same.
Look close, you will notice I have done this with a lot of mine.
I kid you not. They sell bags of rocks. 160. usd. My setup would have taken 1600.00 worth of "ROCKS" to load my speakers properly.
390. each x 5 bags x 2 = 10 bags of rocks for 1600.00 usd.. Nice bags though.. I like the idea, just not the 1600.00. OH They had "Earth Boxes" from 1k - 10k.. NO KIDDING.. Box of dirt.. 10K.
I'll take 5.. Keep the change!
Cabinet material makes a difference too.. My Elixirs are HDF. Go tap on the side walk.. about the same.. The monitor section, 390 lb..
Brass is a popular audiophile material used for damping electronics (and as footers under electronics and speakers). Brass weights with a thin cork or elastomer backing are sometimes used to reduce resonances from undamped metal chassis tops covering electronics. Some use them on top of speakers to drive cabinet resonances to a lower frequency or to damp flimsy/thin speaker cabinets.
I’ve tried Herbies Audio Lab Stabilizers (or two stacked). Pre, DAC or ss amp, but I always end up removing them after some time. Same outcome every time; a bit more clarity and delineation but slight negative affect on soundstaging (within, not overall size) and also a slight loss of the organic flow I have... It’s a fine tuning tweak that not all systems need or can benefit from.
A bunch of us tried this tweak and it worked pretty good: purchase a big container of bee bees and multiple small plastic containers that measure 2”x 2”x 2” and fill this little containers with the bee bees. I placed multiple containers on each piece of equipment. A $20 tweak for multiple components.
@dekay , one might muse that one art leads to another?
"...the turntable is under that cinderblock config over here. I haven't seen my amps for over a year now. The steel I-beam spanning the speakers is starting to flex the floor, so I'm looking on putting some concrete piers under them in the crawl space...."
Nothing Exceeds Like Excess. A variant of the Completion Backwards Principle.
I mass load my tiny novo headphone amp with a decorative bronze statue of a mermaid sitting on an amber colored marble base, very nice looking and heavy. Only reason is the amp is light weight and tends to be pulled on by the interconnects. Now its steady and planted like a rock. Does it sound better? Hell if I know.
Speakermarster says it very simple as it is.
my hifibuddies and myself are using many of these ressonance tweaks and one of my favorites is Ebony blocks about 12x12x6 cm.
by using diffrent materiale and sizes we alter the sound and i sometimes adjust acording to the volumen i play at and the type of recording i am lisining to.
Reading some of the comments make me wonder why some people cannot hear these for me obviously differences when you are damping or undamping the chassis of a component.
Could it be that some systems simple have too many constrictions in the signalflow so you need to find these before you get the bennefit from a more optimised chassis
. I think to observe that one of the trends in ultra highend is that the chassises have become more and more in focus and clearly better optimised.
One of them could be seen with the step from the Audio Research 40th Anniversary to the Ref 10 preamps where the Ref 10 had so much more focus on the chassis. Both models acted very much when you removed the topplate or when you dampend them with reconance tweaks.
Its a very cheap tweak but i takes a lot of time to find the right material and the right spot to place them.
It obviously that diffrent chassis need diffrent tweaks.
By the way i feel the same way with the windows in the lisining room, tweaking the glass ringing makes a clear difference in the sound of the room and thereby the sound of the music.
So another nice challange and never ending story for the audiophile