Brianmgrarcom:
You are correct. The info on the Soundanchors website is incorrect. Apparently the earlier versions did bolt up the rear two mounting holes, but the design was changed because folks were damaging their B&Ws by trying to move the speaker/stand once coupled. The thread inserts in the bottom of the B&Ws are not that sturdy and I guess can be easily stripped out if you apply enough force. Which makes using them to prevent tipping dubious because the pulling force of the speaker tipping could strip those thread inserts in the same manner.
Sound anchors changed the design and now the speakers just rest on the stands. I am also told that bolting them up hard will also degrade the sound.
The best solution I have heard for the tipping is to use a strap that goes from the stand, up and over the top of the cabinet and back down. Looks like crap, but it works. Not something I would use. I think I will just try to get a stable, heavy platform to mount the speakers on and hope that resduces the tipping sensitivity enough.
I am curious to know if anyone has used the mapleshade products? The plinth they make is wider and deeper than the Soundanchors and may be more stable on the thick, dense pile carpet I have. I also have a heavy duty 3/4" pad under the carpet and I really have to stand on any spikes to get them to penetrate to the wood. I am concerned about getting the Sound Anchors splikes through this carpet since I cannot apply enough force once the speaker is mounted.
The other downside is once located, the Sound Anchors are fixed. I often like to toe in or toe out the speakers slightly with program material, and with the sound anchors I could not easily do this.
The plinth would allow me some toe in/out correctablity because the speaker can be relocated on top of its surface. With their wider brass feet (2" diameter cylinder solid brass), stability is actually improved a bit because the spiked tips are very short and if the speaker starts tipping, the edges of the larger diameter feet start contacting the plinth.
The downside (maybe) to the mapleshade products is they can raise the speaker by 6" to 8". This may or may not hurt the sound, although I know B&W 803s are 7" taller with the midrange FST driver and tweeter mounted exactly as on the 804, so I don't think this will be a major problem.