Speaker Spike Philosophy


This is a learning exercise for me.

I am a mechanics practitioner by training and by occupation, so I understand Newton’s Laws and structural mechanics and have a fairly effective BS-detector.

THE FOLLOWING THINGS PUZZLE ME, and I would be glad to hear from those who believe they understand so long as the responses are based on your actual experience or on sound mechanical arguments (or are labeled as conjecture). These are independent questions/musings, so feel free to weigh in on whichever ones you want, but please list the number(s) to which you are responding:

  1. Everything I have read recently ("Ask Richard" (Vandersteen) from 15 Feb, 2020, for instance) seems to indicate that the reason for speaker spikes is to hold the speaker fixed against movement induced by the drivers. I have seen in the past other explanations, most employing some use of the term "isolation" implying that they decouple the speaker (from what?) Evidently the "what?" is a floor that is fixed and not moving (let’s assume concrete slab foundation). So to decouple the speaker from the floor, which is fixed, is to . . . allow it to move (or not) as it wishes, (presumably in response to its drivers). These two objectives, "fixity" and "isolation" appear to me to be diametrically opposed to one another. Is the supposed function of spikes to couple the speaker to "fixed ground" so they don’t move, or is it to provide mechanical isolation so that they can move (which I do not think spikes actually do)? Or, is it to somehow provide some sort of "acoustic isolation" having to do with having some free space under the speaker? Regarding the mechanical isolation idea, I saw a treatment of this here: https://ledgernote.com/blog/q-and-a/speaker-spikes/ that seemed plausible until I got to the sentence, "The tip of a sphere or cone is so tiny that no vibration with a long waveform and high amplitude can pass through it." If you have a spike that is dug into a floor, I believe it will be capable of passing exactly this type of waveform. I also was skeptical of the author’s distinction between *speaker stand* spikes (meant to couple) and *speaker* spikes (meant to isolate/decouple, flying in the face of Richard Vandersteen’s explanation). Perhaps I am missing something, but my BS-detector was starting to resonate.
  2. Spikes on the bottoms of stands that support bookshelf speakers. The spikes may keep the the base of the stand quite still, but the primary mode of motion of such speakers in the plane of driver motion will be to rock forward and backward, pivoting about the base of the stand, and the spikes will do nothing about this that is not already done by the stand base without spikes. I have a hard time seeing these spikes as providing any value other than, if used on carpet, to get down to the floor beneath and add real stability to an otherwise unstable arrangement. (This is not a sound quality issue, but a serviceability and safety issue, especially if little ones are about.)
  3. I have a hard time believing that massive floor standers made of thick MDF/HDF/etc. and heavy magnets can be pushed around a meaningful amount by any speaker driver, spikes or no. (Only Rigid-body modes are in view here--I am not talking about cabinet flexing modes, which spikes will do nothing about) "It’s a simple question of weight (mass) ratios." (a la Holy Grail) "An 8-ounce speaker cone cannot push around a 100/200-lb speaker" (by a meaningful amount, and yes, I know that the air pressure loading on the cone comes into play as well; I stand by my skepticism). And I am skeptical that the amount of pushing around that does occur will be affected meaningfully by spikes or lack thereof. Furthermore, for tower speakers, there are overturning modes of motion (rocking) created by the driver forces that are not at all affected by the presence of spikes (similar to Item 1 above).
  4. Let’s assume I am wrong (happens all the time), and the speaker does need to be held in place. The use of feet that protect hardwood floors from spikes (Linn Skeets, etc.) seems counterproductive toward this end. If the point of spikes is to anchor the speaker laterally (they certainly do not do so vertically), then putting something under the spikes that keep the spikes from digging in (i.e., doing their supposed job) appears to defeat the whole value proposition of spikes in the first place. I have been told how much easier it is to position speakers on hardwood floors with the Skeets in place, because the speakers can be moved much more easily. I was thinking to myself, "yes, this is self-evident, and you have just taken away any benefit of the spikes unless you remove the Skeets once the speakers are located."
  5. I am making new, thick, hard-rock maple bases for my AV 5140s (lovely speakers in every sense), and I will probably bolt them to the bottom of the speakers using the female threaded inserts already provided on the bottoms of the speakers, and I will probably put threaded inserts into the bottom of my bases so they can be used with the Linn-provided spikes, and I have already ordered Skeets (they were a not even a blip on the radar compared to the Akurate Exaktbox-i and Akurate Hub that were part of the same order), and I will end up doing whatever sounds best to me. Still, I am curious about the mechanics of it all...Interested to hear informed, reasoned, and reasonable responses.
linnvolk

Showing 2 responses by pindac

I am a Electrostatic Speaker user for many years and in the past few years have used occasionally a Three Way Floor Stander.

To get the best from the Floor Standers during earlier occasions of use I have used various Sub Plinths,
that in the end become a Two Tier Sub Plinth,
using a highly compressed Chip Board as the Base Tier, that is Spike Foot coupled through Carpet to a Concrete Screed Floor.
A 40mm Thick Granite Slab is the Top Tier, that is Spike Foot Coupled to the Chipboard.

The Materials chose in the Sub Plinths were selected from a variety of used materials.

The Speakers were seated directly onto the Granite and as an alternative seated with onto the Granite with Spike Coupled Feet.

The Speakers were at their best 'in my view' when the Spikes were used as feet.
When used during this time period, I also had a selection of Dumbbell Weights seated on the top of each Speaker Cabinet.
I recall that by moving the weights off centre into different positions had the effect that I would refer to as a attenuation and could produce a very slight change in how the sound is being perceived.

Very recently I reintroduced the Speakers into the System, they were allowed to see the light of day after a long term storage and used in the New Listening Room Space I have recently created.

I worked my way methodically through their Setting Up and settled for the above set up.
It was for myself, being perceived as being correct in many ways, the result being,
the Speakers were much more impressive in the New Room, when recollections of their previous usage were taken into account.
I am yet to add the Weights to the Top of the Cabinets

I had a opportunity to trial the Speaker Set Up a little further, using a change to a footer, the good impression they were making was a stimulus for the extra investigation.

I had produced similar things for others in their Home Systems and the impression made was enough for those who experienced to create similar Set Up using either Townsend or Gaia Footers

I Seated the Speakers onto Audio Technica AT-616 Pneumatic Feet and was left thoroughly captivated, the effect on the SQ was not expected.
The impact they were having on the SQ was quite noticeable and further enhanced my already good impression.

I have one more trial to undertake, which is to protect the AT 616 Top Surface and Place them under the Speakers Spiked Feet.

I will say the Spiked Footers under the Speakers when used on the Two Tier Sub Plinth Set Up is allowing for a imaging and Soundstage with a defined edge. ( A Electrostatic Mimic )
 
The AT-616 have blurred the edges ’very slightly’, giving a richness to the presentation with a noticeable weight underpinning the performers.
The Soundstage is now perceived without a Boundary and the experience has that added effect of being more honest / believable. ( This has made such a impression on me, afgter Twenty Plus Years of Electrostatics, they are now in Storage, allowing for myself to get the most from this Set Up )
I have never set out on the path of placement of Speaker on Sub Plinths and Footers with a Science for what I am doing in mind.

I started out with Steel Mounts for Two Way Speakers, and then ended up filling the Steel Mounts with Kiln Dried Sand and this evolved over many years into variations of configurations of materials.

Today at hand are a selection of Materials to create different configurations of Mounting for a Speaker, beyond the immediate available Flooring.

A Willingness to periodically trial new discovered Materials as continued Investigation has resulted in increased material options over time.

I know today I am attempting to manage a energy transmission and attempt to use this management of energy transmission to allow for a Speaker Presentation that is most pleasing to my own unique preferences.
I use what is learned from these experiences and take them on board for all of my Devices Mounting requirements.  
In many cases there is more of a attenuation created through a materials exchange, it can be perceived as more of a change to a devices flavour other than a improvement.
That is about the extent of the Science used today in my participation.