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Will adding Marble tops improve speaker performance?

Old vintage Empire speakers came with marble tops. I think it served 2 functions, one being a giant coaster to prevent stains, as the design definitely invited the use as end tables, and secondly (as you are attempting) to mass load the speakers. I have the Empire Cavalier 2000, minus the marble tops. These are the speakers to play pipe organ music with, as they do go really low (and powerful).
Empire-9000-Royal-Grenadier.jpg

These (pictured above) are the Empire 9000 series with marble top.

I'd source a local countertop maker. I have one in the next town that made me a TT base for not too much.
 
Does this look like the product you are using?
https://www.amazon.com/EPPCO-Enterprises-1864-Tool-Liner/dp/B000VHXEJ6

Sounds about right, slightly clingy but not sticky and not a rubber product!


Heather, using marble or granite on top might work nicely.

I'd suggest skipping inner tube rubber and use a toolbox "grip/grab liner" type material. I bought some awhile back to line the drawers of my roll around tool boxes, but it works great for other things. Cuts easily and is super grippy, you'd swear it has adhesive on it but it doesn't , and it peels back up cleanly without leaving residue. Stuff placed on it will not budge if you try to push it sideways. It's a soft rubbery consistency and is available in several thicknesses.
 
I’d experiment with Dynamat, foil side down, plywood and milk jugs filled with sand at the approximate weight of the stone. The Dynamat provides constrained layer damping and protects the speaker finish. If that works get the stone and stick the Dynamat to it.
 
Put some plasticlay (non-hardening modeling clay) between the speaker cabinet and the marble top. JoAnn Fabric has the modeling clay, if you have one of those near you.
 
I did consider taping the bottom of the stone with Gorilla Tape -
its double thick and quite sticky (and I already have an unused roll!) ...

Well, the drawer liner product is $12 for 18 x 72 ...
and I just need 18 x 48 (2x 18x24) - cheap enough to give it a try. It should arrive Sunday!

Dynamat (brand) is MUCH more expensive
 
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Well, the drawer liner product is $12 for 18 x 72 ... and I just need 18 x 48 (2x 18x24) - cheap enough to give it a try. It should arrive Sunday!

I did consider taping the bottom of the stone with Gorilla Tape -
its double thick and quite sticky (and I already have an unused roll!) ...

After reading an in depth discussion over at The Garage Journal, I went with the Harbor Freight product for my relined roll-away cabinets. That was several years ago and it's holding up well. If you're placing it between two relatively flat surfaces, then I doubt you'll have problems with it harming the finish. I'd just check it periodically. I use the stuff all over the house to keep things in place. I would not use anything with adhesives, like Gorilla tape, between the surfaces.
 
I'm thinking of a slab of marble on the top of the cabinet - with something like sheet rubber (inner tube strips? duct tape?)
on the bottom of the marble to better isolate it from the cabinet.

Dunno if it'll work, but maybe shelf liner or toolbox drawer liner? I've used the solid toolbox drawer liner from Harbor Freight not only to (obviously) line the drawers of my roll cabs and the insides of my toolboxes, but it's just handy stuff to have around. Pretty sure the gaskets in my KLH Twenty Fours are made of the stuff too :)
 
Dunno if it'll work, but maybe shelf liner or toolbox drawer liner? I've used the solid toolbox drawer liner from Harbor Freight not only to (obviously) line the drawers of my roll cabs and the insides of my toolboxes, but it's just handy stuff to have around. Pretty sure the gaskets in my KLH Twenty Fours are made of the stuff too :)

Yep, I too have found all kinds of uses for the stuff. I've tried others, but I like the HF product the best.
 
Yep, I too have found all kinds of uses for the stuff. I've tried others, but I like the HF product the best.

I needed to line a box last week and never found the time to stop at HF due to life craziness (I live two blocks from one, but I haven't actually been home all week), the Orange Colored Store had a very similar product that I liked just as much. It feels a little heavier and stiffer, not sure which I actually like better. Was harder to cut though as it had some fibers in it. Was a little more expensive but not too bad, I think about $10. Probably would have worked better if I hadn't been in a hurry and had found some razor blades instead of just using my pocketknife, but it turned out beautiful.
 
Are the sides of the speaker sufficiently strong to support that weight without sagging over time?

The cabinet material greatly matters.

MDF is notorious for sagging under pressure. I can't tell you how many 1/2 inch MDF shop shelves or bookshelves I'd had which sagged under modest loads. The books weren't that heavy, either. It was the unsupported span, just as the sides in a cabinet are an unsupported span. I've also had thinner plywood sag. The shelves I built for a pantry are all 3/4 inch plywood, and no sagging under heavy bottles, but the span is not that great, about 26 inches.

If the top or sides fail it could be disastrous for the drivers, particularly if it fails such that the baffle buckles.
 
The sides of cabinets are in compression. The front and rear panels as well as any horizontal internal bracing will reinforce the sides against bowing.
 
I'm thinking of a slab of marble on the top of the cabinet - with something like sheet rubber (inner tube strips? duct tape?)
on the bottom of the marble to better isolate it from the cabinet.

I know the Westlake speaker folks use a proprietary tarry material to paint the insides of their Monitor cabinets,
and my UREI 908As have an (hardened) outer coating much like pickup truck bed liners ... they are deadened,
but I'm thinking upping the Mass would be a good thing.




Ah - perfect response, JoeESP9! Direct Feedback!
I'm just thinking I'd get a better Spousal Acceptance Factor with a tan or brown toned marble instead of concrete or bricks on top.

FWIW, we have older hardwood floors from the 50s - so I'm hesitant to put spikes under the cabinets!

Getting to your last paragraph, can’t you purchase small disc’s that sit under your spikes? It’s a 2-3 person job I guess to get them positioned correctly without damaging your hardwood floors, but don’t rule out spikes.
 
This time, I am investigating prices and such to put 1" thick marble slabs on top of
some speakers I am trying to improve the low end with. Overall size would be 24 x 18 x 1 inch,
or whatever thickness is available at the stone cutter shops in the area.

I've used these in the past, but they are not large enough for your speakers. It's possible someone makes larger ones already cut to your size. I use self adhering 1" diameter felt pads under the slabs to avoid scratching or vibration.

https://www.kitchencollection.com/kitchen-collection-marble-pastry-board-20511-white

Here is a 24 x 16 slab for $50. There are others online that are 12 x 18. You could use two of those together to equal 24 x 18.

https://www.crateandbarrel.com/french-kitchen-marble-pastry-slab/s285048
 
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Many granite cutters have scrap pieces left over from installs you might pick up cheap, but keep in mind these slabs are only polished on one side so the bottom will be rough and uneven, you will need something soft and sort of thick to fill in the spaces or it could rock a bit (pun intended).
 
For those who have an irrational fear of anything "nu-q-ler" (nuclear) read the quote below. Frankly I've always been more concerned that so many with the responsibility of controlling nuclear weapons can't pronounce the word correctly.

Both granite and marble are naturally occurring materials that were formed millions of years ago similar to minerals. Generally these substances contain traces of radioactive elements like uranium, thorium and their daughter products like radium polonium and radon. Aug 23, 2015
 
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