SVS Subwoofer Isolation feet. Will I lose bass?

do the positives outweigh the negative of less output?.

@dtximages

Aye, there's the rub, for in that sound of boom what sounds may come must give us pause and make cowards of us all.

- When I die Shakespeare will surely have words for me, I'm pretty sure we'll both end up in the same dry, hot place.

I teach emotionally disturbed kids and this thread makes me feel like I'm back at work!

I'm using townshend speaker bars on my standmount speakers, on an oak floor on concrete. The stands are weighted with atacama atabites for a total mass including speakers of about 27kg each.

There is another set of 4 decoupling durometer pads on the top of the stands. The townshend are not cheap new price was about £900.

 I always buy isolation devices 2nd hand and paid £400, figuring if they did nothing I can move them on. They are entirely positive in my experience, imaging is improved bass is cleaner.

For a front firing subwoofer I would expect improvements too for sure, for down firing sub , I can imagine things could be different but I wouldn't say they don't work without trying them first. 

On my down firing REL transmission line subwoofer I replaced the stock feet with stillpoint ultra SS, I also again found improved imaging here weirdly but that might be about controlling vibrations into the rest of the room and system, or it could just be a harmonics thing, bass is cleaner.

Bang for buck these are low in my system but they are gains so I'm still very happy. I used to use spiked stands before.

Ymmv

+ geoffkait

Springs will allow the low frequency energy to pass through the path of least resistance = air.
Springs will also tighten up the bass as well.
*Obviously the correct tuned springs for the mass is required*


And for a very moderate investment into a bit of personal scientific research, I could not more highly recommend seismic isolation for the vibration makers in the room.
It simply works, just as goeffkait states.

I thought that the test that showed the most deviation was when he used the packing foam as the mounting device.

It is my understanding that a ported cabinet is a tuned cabinet where the designer is using the cabinet vibrations and internal air pressure to help increase output and enable the sub to cycle lower. In the REW analysis, there appeared to be very little difference in output and low end extension with the three mounting methods (iso feet, packing foam, batteries) when the sub was in extended and standard modes. When the sub was in sealed mode there was very little difference between the iso feet and the batteries but a significant difference with the packing foam.

So my conclusion, though maybe incorrect is that the iso feet aren't doing a lot, at least on a concrete slab, and that the port plugs and the packing foam are changing the tuning of the cabinet in a way that reduces output and low end extension.

I believe that he did not run the test with the stock feet.

Test 1 - Iso Feet
Test 2- Packing foam
Test 3 - Batteries (ridged)