what is the theory behind maple stands and racks?

Magfan, I used a 1.5" exotic granite slab under my TEAC Esoteric X-01 Ltd CDp for a while. . . In my opinion it hardened the sound. At the time I 'solved' the problem by interposing a $15 IKEA square stool top between the 2. But now the pretty granite has been relegated to end-table-top duties in the living room, and I have the CDp on top of a 50 year old 42"x22"x2" slab of solid african Mansogna wood. . . it does not seem to impart the system bizarre resonances. Some rack makers do use granite, but often not by itself. E.G. HRS does not use pure granite shelves. . . but uses granite as the top layer of composite shelves. G.

Any fans of granite shelves?

Mapleshade claims they have done comparison tests and have found that North American Maple "sounds the best". They are in the business of selling the stuff, so I take their claims about maple with a pinch of saw dust. Who knows - maybe a little bit of the right kind of "sustain" in your platform makes your audio gear "sing" like a stratocaster?

In my limited fooling around with different isolation platforms, I cannot tell the difference in sound between Maple, Ash or Bamboo. BUT I find that I can tell the difference between intact wood and MDF, particle board, synthetic materials or steel (although Aluminum may be a good choice), with wood sounding the best to me. And the thicker and heavier the wood the better.

I can see it now - knownothing's Genuine North American Tree Stump Equipment Stands...

Audiofeil, you are correct in that most baseball bats are traditionally made of ash. A few years ago, maple became the trendy new bat when MLB approved the "Sam" bat made by a guy in Canada. When Barry Bonds adopted the maple bats, they started to become more common. However, there is now a movement by MLB executives to get maple bats banned. When they shatter, they tend to break into big chunks with huge jagged sharp ends that go flying into the crowd. They're considered dangerous because of this. The players who like to use the bats are not too thrilled about this and there might even be some union issues involved if MLB follow through on trying to ban them.

Anyway, the new season starts today! Take me out to the ballpark!

Apparently most if not all high end drumsticks are made of maple, for example all 10 models of Vic Firth drumsticks. Including, yup, the Charlie Watts Signature Drumstick. Probably just coincidence.

Maple is also used for quasi mystical reasons. .. i.e. there exists the urban legend that the old master luthiers like Stradivari, Guadagnini, Testori, Guarner, Amati, made their violins, violas, cellos mostly from maple. . . truth is that maple was frequently used, but only for instrument backs, and was often replaced by other inexpensive local timber, like poplar, nowdays relagated to constructing orange crates.

Why not experiment with other inexpensive hard timber in racks? Lyptus for example is slightly harder and denser than maple, mechanically as stable, and slightly inexpensive. Ype is even harder, heavier, and even less expensive. . . and then there is Ash, as mentioned by Bill. . . yet, the mystique of maple continues unabated. G.

The trouble with oak is it is far too lofty and grab up all the light. Maples have been oppressed.

Most pool cues are made of maple (at least the shaft portion), probably because the highish specific gravity leads to improved stiffness and a lower susceptibility to moisture related changes.

Many audio equipment platforms, etc. are made of maple because audiophiles believe they can hear a difference between an amp sitting on maple and one sitting on oak, and also because we receive a catalogue from "Mapleshade" and none from "Oakshade."

Charlie Watts likes solid maple drums, I think he has them made in Maryland somewhere. Could be the maple preserves the dynamics without screwing up the tone, as might be the case with other materials like MDF. Maybe NASA or someone should do a full blown dynamic analysis to see why maple is good for sound.

>>A lot of baseball bats are made with maple because of this<<

Actually most are made of ash.

Llyodc,

Here is a very theoretical and probably not very satisfying explanation for what I have experienced first hand with my system. I think part of the appeal of hardwoods (not just maple) for this application is that in fact they are not so hard that vibrations just bounce off the material and back into your gear. When the piece of wood is thin like a violin or a guitar, the wood will resonate a great deal (a good thing), and these musical instruments tend to be made with thin pieces of softer woods put together in configurations that will resonate just the right amount.

When hardwoods are cut or glued together into thick slabs, their resonant properties are different from thin pieces. Vibrations entering the slab from one side are dampened as they travel through the material and as they are reflected back. So while the maple slab doesn't absorb and eliminate all vibrations from your gear and the room, it definitely mutes them. Think about the difference between being inside an old wooden ship made of thick timbers and a newer steel ship made from relatively thin sheets of metal - they definitely "sound" different with the steel being much more resonant and "live" sounding.

So why not use particle board or MDF which are less lively than solid or glued hardwoods? All I can say is that they are either TOO dead, or because they lack the complex structure of intact wood fibers, they cannot drain vibration away from your gear as effectively. Apparently some vibration is a good thing!?!

Lastly, the best hardwood vibration platforms I have used are thicker and very heavy - a full 2" thick or more - so they have a lot of inertia to stay put and not respond to vibrations coming from the room or your gear itself. Thinner glass, steel, MDF shelving while strong enough to hold up your gear would be easier to set in motion - especially by lower and more powerful frequencies.

Hope that helps a little.

Markphd, your Linn TT platter rings? That can't be good, especially if the music contains that frequency.
I had a Dual many years ago with a 2 piece platter.....Each piece by itself would ring....nice sustain, too. But together they were pretty inert because they were at different, non-cogging frequencies.

Your question and comments don't apply only to maple. They are equally relevant to any type of wood. A search of the archives will turn up some threads on glass versus metal versus wood racks/stands.

Why is maple often used as opposed to any other wood? Well, it's hard with good stiffness and rigidity. A lot of baseball bats are made with maple because of this. These characteristics are augmented by the fact that it does not have a lot of knots. It's dense, as you note. The grain is very tight. Its grain doesn't split with time like oak has a tendency to do. Many woods have these characteristics but some of them are exotic or otherwise expensive because of limited availability. Maple is common, readily available, and inexpensive. It's kind of bland and neutral (except for curly or bird's eye maple), even when stained, but it fits in with most decors because of this. That's why maple is one of the standard finishes for many speakers, along with cherry or basic black. It has good WAF, especially when compared to many metal racks that often have a macho, industrial look to them.

So for all of these things, it's very practical if you want wood rather than glass, metal or veneered MDF.

Now, what about the acoustical properties?

All the things you say about ringing and vibrations are of course correct. However, it applies to everything else too, including glass or metal stands/racks. All physical substances have a resonant frequency and will "ring" if you hit the right frequency. The platter on my Linn turntable rings like a church bell. So you deal with it the same way you deal with any other type of rack you have, or with any other component in your system. You alter the resonant frequency in the way you construct it to make it less audible; you isolate vibrations; you “drain vibrations” away, etc., etc. In your post, you seem to anticipate and dismiss the draining away of vibrations as a satisfactory answer. However, that is one of the techniques used. So like it or not, that is one of the answers. And you can find many, many threads in the archives on vibration control, both in theory and in practice. I can’t possibly repeat all the points made.

Your point about the component not being isolated from the stand/rack is a bit difficult. Many techniques of vibration control, and products made to assist in this, do isolate the component from the stand/rack. And many components themselves are constructed with internal vibration control or isolation.

I can’t resist making a few comments about your post’s points about electric guitars and sustaining notes. I’ve made a couple of solid body electric guitars as a DIY hobby. It was part of a guitar making course I took at a local pro shop. I’m not a pro or an expert, but the guys who taught me are. The choice of wood for a solid body electric guitar, as opposed to an acoustic guitar, isn’t typically related to its acoustical properties. It is certainly possible that some musician may come into the shop to have a guitar made and say such a thing. But it’s a bit of a stretch. Any acoustical properties of the wood in the guitar will be overwhelmed by the tone control/settings on the guitar amp, or any effects pedals/boxes. The guys at the shop told lots of stories of pro musicians who came in to have their guitars made/modified a certain way for whatever reason. Well, the customer is always right so they do what they’re asked to do.

Anyway, to succinctly answer your initial question, the theory behind maple racks/stands is the same theory that is behind racks/stands made out of anything else, wood or otherwise.