SVS Subwoofer Isolation feet. Will I lose bass?

+ 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)

Some people posting on this thread are not nearly as amusing as they think they are.
 This forum would be a far better place without them

to the OP, as with anything your mileage may vary, so I'd recommend finding a low cost way to test this if you are interested in how sub isolation might affect your sound.  Either find a place to buy with a return policy or buy them used at a price you can then resell at.  

I'm using isoacoustics feet on my Martin Logan towers to good effect (and well worth the $) but when I tried using similar isoacoustic pucks under my ML sealed subs, I found they made the subs sound horrible.  I actually thought I had a woofer that had gone bad as I was getting audible distortion from them.  I removed the pucks and the sound returned to normal.  

I don't have a detailed explanation as to what caused these particular subs to react so negatively to this particular product in my room, but suffice to say that these types of products can impact the sound and sometimes that change will be positive and sometimes it will be negative.  I think you just have to try and let your ears tell you whether the change was better or not for you.  

@shiner01  Thanks for posting.. Great information.