Speaker isolation or absorbtion - what is best?


I have Verity Audio Parsifal Encores on a carpeted concret floor in my basement, using the stock brass spikes. I am reading up on possible improvements through isolation/vibration control/absorbition.

There appear to be two schools of thought. "Isolation" decouples the speaker from the external environment, leaving the energy of the cabinet with no where to go, but prevents distortion caused by energy transmitted from the cabinet to the environment (e.g. a vibrating floor). My spikes on concrete are an example of isolation.

By contrast, absorbtion "drains" the vibration energy from the cabinets, thereby reducing its harmful effect on the speaker performance. Stillpoints and symposium are examples of absorbtion based approaches. This appear to me very opposite philosophies of how to go about improving speaker performance.

Three questions. First, is my understanding correct? Second, in my environment (carpeted concrete), which way should I go to get the best out of my parsifals. Third, what specific products (platforms, cones, spikes etc) have you used succesfully with the parsifals to achieve optimal isolation or absorbtion (on a carpeted concrete floor!)?
edorr

Showing 1 response by newbee

Some speakers vibrate (resonate) at certain frequencies. Some do not do so, noticeably, at any frequency. (I just use the hand test.) If you want to effectively drain this resonance, assuming you could do so at all, you need to know the frequency at which the resonance occurs and then find materiel that will absorb that frequency.

IMHO, concrete floors inhibit any 'drain' potential, with or without coupling with spikes etc. If you think draining away vibrations from your speakers will benefit the sound you need something between the speakers and the floor that will absorb the resonance frequency that the speaker is creating. To some degree your carpet and pad are already giving you some 'drain' potential. Absent specific information regarding the speakers resonance you can use a broad base absorbing materiel like sorbothane.

Now, my opinion about 'draining' vibrations - for the most part I think the theory was created by an artful salesman. Consider that the real damage is done when the resonance frequency causes some sonic damage. This has already happened before you could effectively 'drain' any vibrations. Unless the speaker actually has the capacity to store this energy, thus magnifying succeeding identical resonances, it is too late. I am unaware of any high quality speakers that actually have the capacity to store energy.

The only reason I would put spikes/cones between my speakers and a concrete floor would be to help stabilize them and I would be sure to penetrate the carpet/pad.

That stuff comes from my experience years ago with concrete floors. I now have wood floors and I use soft absorbant materiel to neutralize vibrations flowing in either direction.

BTW, play around with the alternatives and then trust your ears. If you can't hear it (the differences) then they must not, for you at least, exist.

FWIW, just my humble opinion.

BTW, nice speakers! Very nice.................