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SVS Subwoofer Isolation feet. Will I lose bass?

Most of what I see about subwoofer isolation has to do with minimizing rattles or bothering the neighbors.  But what about a sealed subwoofer on a concrete slab?  Would these dampeners not "dampen" the bass as well?

My setup...  Dual SVS SB16s on a concrete slab.  I don't have a rattle problem and the room is 20ft tall so I can't afford to "lose" bass because of my shakey rubbery feet.  

I've read and seen many great things about these but I have a hunch it would hurt a sealed sub on a slab more than help.

dtximages
dtximages OP
365 posts
 
@laskakj 

Thanks for the real-world experience and with the same sub!  That's kinda was I was suspecting.  I don't like hearing the loss in "chest rattle" as that's why we buy big subs in the first place.  But if the quality is that much more significant then perhaps it's worth it.

I really cringe at buying MORE Gaias for my subs too though.. That's $1200 in isolation for me :(
bdp24's avatar
bdp24
9,788 posts
 

Actually Geoff, the video to which I’m referring is a different one. It is entitled "The effect of ground vibration on audio systems", and was taped in a private space (maybe at the Townshend facilities?). It starts with Max discussing the problem, then moving on to possible solutions.

He is shown standing behind a table (and in front of a projector screen, used in his presentation), on top of which he demonstrates different forms of "mass on spring" isolation. He demonstrates the differences between spikes, a plain spring, and his Seismic Pod (which contains the same spring). He covers the issue of the undamped movement of the plain spring vs. the damped behaviour of the Pod.

geoffkait's avatar
geoffkait
23,365 posts
 
Ack-chew-ally the video I posted was actually more to the point concerning cement floors. Yours was good too. 😬 As I previously pointed out damping the springs hurts the isolation and - more importantly - is audible. 😩 The video I posted also shows that damping the speakers or mass loading is not necessary once the speakers are isolated. 
geoffkait's avatar
geoffkait
23,365 posts
 
The missing “chest rattle” people report is the lack of boom and distortion when the sub is properly isolated. Key word: properly. When a speaker or sub is properly isolated the bass frequencies are lower and more articulated with more slam. Everything is better and it’s the same for any speaker. Hel-loo! What’s the hang up? Talk amongst yourselves. Smoke if ya got em.
dtximages OP
365 posts
 
@geoffkait then how do you explain significantly less db at 20hz -  80 hz?  That's not "better" it's just quieter.  So of course there's less perceived boominess and distortion.  

Check out the video that shows his testing and measurements with/without feet as well as ported vs sealed..


UPDATED Subwoofer SVS Isolation Feet vs Rigid vs Foam Testing
https://www.youtube.com/watch?v=7uEdZ6KMuLM
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