There's a YouTube vid I watched from a guy last night who did some measurements but I wasn't quite convinced I understood what he was saying.. He has a PB4000 (ported).. Ran REW both ported and sealed with the SVS feet. According to the chart, it appeared (again I'm not sure what I saw because it was like 2am) that they made almost no measureable difference while ported, but significant decline in output when sealed.
When he explained it, it made sense given theres much less cabinet pressure to move when ported.
Just wondering yall's opinions. |
geoffkait, I understand that. But if you have a sealed sub on a slab, wouldn't the "wobblyness" be counteractive to the woofer? Lessening its effectiveness? Lowering its output?
According that dudes youtube vid, that's exactly what happened I think! But I have not heard others say this is an issue.
I figured, surely, someone has first hand knowledge of the effectiveness of these feet, or Auralic Subdude on their sealed slab-sitting sub. |
Ok the SVS are not springs. They're little malleable pieces of rubber with zero engineering thought included. There certainly is back and forth.
These are not isoacoustics feet. |
@erik_squires
Thanks, that's the kind of info I'm looking for. So basically, leave the factory rubber stubbs on sealed woofers on a slab. |
Talking about the benefits of component or general isolation is not the topic here..
I go back to where a guy on YT did an experiment with the SVS rubber Isolation feet on his sub in sealed mode on a concrete slab and the output was significantly less when measured with a mic.
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@bdp24 This is a video done by Townshed to promote their product right? Have there been any/many independent users to cite similar experiences? I've seen tons of great things on Isoacoustics and have a pair of Gaia II's (not installed yet).
My question is mainly for the effect of a large sealed subwoofer on a concrete slab. I would imagine, and some have agreed here, that the isolation feet would be detrimental to output in THIS situation.
I'll check out the Townshed vids though. |
@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 :( |
@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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I think some people are too smart for their own good and too dumb to know it.
1. The SVS Isolation feet are basically the same as squash balls or any other type of rubber device that limits the transmission of energy into the floor.
2. This conversation is NOT about spikes, it's about isolation feet in a sealed sub on a slab floor and its effect... Detrimental to output? If so, do the positives outweigh the negative of less output?.. No theoretical bs about layers of quartz rocks.
3. Can you block someone from posting on a thread?
4. If I told geoffkait he's the smartest person in the room and gave him a cookie would he go away? |
@jetter yes mine came with the normal small hard rubber feet to keep the sub off the floor about 1/2 inch.
99% of the things I've read/seen/heard about the SVS isolation feet has been positive. Tighter more accurate bass, sometimes deeper bass, etc etc..
But, the last YT video i watched mentioned that on sealed woofers, there's a significant db drop.
So, to get this tighter/cleaner bass, am I sacrificing output? According to his measurements, it's significant.
That's the question. |
To expound on the YT vid I mentioned, his measurements, if I remember correctly, showed almost no impact on a PORTED sub. There certainly is a difference in the way cabinets react to a moving woofer in a sealed cabinet with no air escape, so this seems to make sense.
If these feet are detrimental to a sealed sub, I wonder why i have not heard anyone mention it.
Could it be because we're all sheep and agree with our favorite poster or reviewer?
I know that MANY people have sealed subs and have sought after isolation.
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@audiorusty My understanding of the video was it measured much higher plugged without isolation feet. Then much less with isolation feet.
He talks about why he thinks there was very little difference with/without feet unplugged... yet a significant difference sealed with/without feet.. So to be clear:
Open ports = almost no difference in stock vs Isolation feet
Sealed = significant drop in db when using isolation feet |
@shiner01 Thanks for posting.. Great information. |
@dyson2004 it's because everyone is suspicious of snake oil and people have different opinions. The consensus here is:
the SVS feet will relieve vibration in walls and downstairs. But on a concrete slab they probably do nothing positive for the bass. Most of the responses here are about their performance on second floors where the sub shakes the whole house.
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I'm the OP. I'm sure it does help on the second floor.. But the post was the effect the feet would have on a concrete slab solid floor. Not on a second or elevated floor.
If you're on the second floor, I'd like to know the difference between using the feet and just turning down the volume because that's essentially what these do. |
