Subwoofer Isolation, what do you think...

Hi Newbee,

Thank you for your clarification.

Yes, it is critical that the support that is under the component not add its own negative contribution. That is why the choice of materials is very important. I do not recommend using materials that tend to ring (metal, stone, glass, etc) or are known to be significantly resonant (wood, acrylic, plastic, etc) as they will impart those qualities on to the signal that is flowing through the component.

If a damping device is used to control vibration it should absorb as much vibration out of the component as possible without subsequently releasing it back into the component. The more well designed the device is the more able it will be able to achieve that goal.

The "sandbox" you asked about (and which is widely discussed on many internet forums) is our Big Rock platform. The Big Rock was created by me in 1985 and I was granted a patent on the design in 1993. When the Big Rock is set up according to our easy to follow instructions the Plinth (top plate) upon which the component or speaker rests does not flex or deflect in reaction to speaker's movement. It is held firmly in place so that Doppler shift is minimized. If a person does not follow our set up instructions properly or does not use the leveling tool that we supply with the Big Rock it might be possible for the speaker to not be supported as well as it should be. We always recommend contacting us directly if a person has a set up questions.

We do have laboratory measurements that show the improvemnets to a speaker's performance when used with our products. Those interested may view the measurements here:

Link

I have also posted an extensive discussion of vibration control as it pertains to loudspeakers at this Audiogon thread:

Link

Your comment about air-borne vibration that is affecting the component is well considered. If the air-borne vibration is allowed to affect the signal that is flowing through the component, how can "draining" it after the fact return the signal to its previous, pristine state? The same would hold true for internally-generated vibration.

Best Regards,

Barry

I understand a 25lb of shot on top of a gloss black sub is not WAF compatible but it can put placed on the sub when listening only. I thought my 105lb velodyne was well built enought but the top is still less than 1" thick and not brased enough. Bob at www.audionut.com suggested this, but he dresses up the bag with a dress black sock slipped over it (make sure not to use a goldtoe sock)

For your turntable isolation post on the analog forum to get the best feedback.

I can't believe the great information and knowledge I've be able to learn from with my original question. This 'forum' thing is truly incredible place to find out answers to things. I say that with all sincerity. I'm even going to dig out some of my big 'deep-drop' leads we use for big groupers and snappers 1000' feet down and just see what effect that has substituting that for Cytocycle's 'bag-o-shot'. Once my turntable is stabilized better I'll compare the hard feet (spike-type) to those 'nodes and see what I come up with... meanwhile tight lines and keep those round things spinnin