Is Spiking Necesarry?

No.... but spell checking is........

@gdhal   I appreciate your question about the Herbie's gliders.  It is easier to move the spiked speakers with the spikes in the gliders.  I am still careful when doing so as I fear toppling over my speakers if moved carelessly.  

I just found my email correspondence with Robert Herbelin from Herbie's Audio Lab about the gliders.  Here it is:  

Placing a Cone/Spike Decoupling Glider underneath each cone and spike of the speakers would likely be beneficial, better isolating the speakers from the floor and any vibrations that would affect the speaker's performance. Many of our customers have found that the Gliders improve bass response and linearity, as well as other subtle sonic improvements throughout the audio spectrum. In addition, Gliders allow for easy repositioning of the speakers when needed. Between the three different options, titanium has the best potential to control the very high frequency, acute vibrations that tend to cause glare, though that potential isn't always realized; besides that, sonic differences between the three metals is subtle and system dependent. Due to the lower price, brass is the default recommendation; stainless steel is a good alternative to brass if you prefer the stainless steel aesthetic, and titanium has the greatest potential for controlling vibrations among the three (again, that potential isn't necessarily always realized and is somewhat system dependent).

@hifiman5 

Thanks. I'll give the gliders some consideration after I get my speakers set up in a week or so. I'm getting the Triton Reference and I will be spiking them to the floor (through carpet onto wood). Another concern I have with the gliders is that I imagine they raise the height of the speaker at least a half inch, maybe more. Not that a half inch is ultra critical, but many speaker manufacturers situate the tweeter at 41 inches (or thereabouts) because that is the typical ear level height in the seated PLP. Also, in my case I have some acoustic panels that were also placed with the height of the tweeter in mind. Still, the gliders do seem worthwhile and are not expensive (as audio gear goes) either.  

@gdhal  The Herbelins will let you return the gliders if they don't work for you.

For many years, as a machinist and field tech with the Westinghouse Corp. I spent a great deal of time analyzing and solving problems related to resonance and vibration. Wither to couple or to isolate, you are looking at two very different solutions to address a common problem. While it does make moving a heavy speaker a bit more difficult, using a good, well secured set of spikes can be very effective, as long as the floor itself is good and solid. Spikes help to solve three problems. They eliminate looseness and vibration between the speaker and floor; they couple the relative small mass of the speaker to the much greater mass of the floor and structure of the home which helps to reduce the chance resonance and they prevent your speakers from walking. Spikes is, by far, the cheapest and easiest way to solve most problems and get better sound from your speakers but if your floors are not solid or you live in an area of heavy traffic and are getting outside vibrations through your floors then isolation (usually much more expensive and difficult to achieve) is your best option. There are some very expensive products out there that may or may not work. Not only do you want to reduce or eliminate vibrations from outside sources, you do not want to cause instability and movement of the speaker itself. Try first, before spending a lot of money, a small, thin, sand bag or firm gel pack under each corner of the speaker. Sometimes the simplest and cheapest solution is the best.
Regards,
Jim