I had some problems regarding vibrations with coming from the wooden floor in my house (gonna support it from the cellar with some wooden bars to avoid the whole flor from swining but still there will be some impact sound from walking around. So I built a prototype of a air suspended base to get rid of this. Does anyone have experience with experiments like this?
At the moment two Silvercore 833 mono power amps plus one Kaiju are sitting on the air suspended top board and it is almost gone - overall the sound is much more stable and on the spot now - bass won dramatically and the mids as well.
Actually I just took four small tubes for bicycle tyres and connected them via some pneumatic hoses via their valves - built a frame underneath the top board of my rack (200x50x2,5 cm (actually 2 times 2,5 cm as I had to use two massive oak tree boards because of the weight of the amps that made a single oak board bend after a while because of the uneven weitht distribution - different amps = different weights) where the bicycle tubes fit in - then just pump the right amout of air to get enough pressure to elevate the top board about 5 mm while the amps are sitting on top and that's it.
I thought the trick is to have the same pressure all over (just realised that this is not working very well - the top board of my HiFi rack is about 2 meters broad - so the different weights of the amps even makes the massive oak bend makes it bend after a while so the whole thing started to look like a banana (but still worked fine - which actually is amazing). So what I did is to divide it in to two circle runs - one connecting the outer tubes (where the heavier Silvercores are sitting on top) the other connecting the inner tubes (where the less hevy Kaiju sits) and now there is no more bending effect - I was very surprised that a massive board consisting of two massive oak boards (each one inch thick - makes a two inch tick board (!) bends under the weight - but it is what it is...
In the future I will try single bases for each amp because the Silvercores are much heavier than the Kaiju and I am already researching for air based bungees to make the thing look a bit more sophisticated.
Does anyone in here have experience regarding experiments like this? I am researching for smaller air springs and already found some stuff that looks good...;o)
Picture: as you see, the top board is elevated from the base and one can see one of the bicylcle tubes - looks adventurous (it's just a prototype or an experiment) but it works. In the future I would like to use massive slate boards and pneumatic bungees for this and will try to calculate resonance frequencies including the amps weight...
Chris
Sony 557ESD
Thorens TD 124 Mkll
Lenco L70 (PTP tuned)
Apple Mac Pro / Media Center 23
AN Kits L4 Preamp
AN Kits L4 DAC / MiniDSP
AN Kits L3 Phono / Bottlehead EROS
Bottlehead Kaijus for JBL 2402, JABO 75 (JBL 2445/Truextent), Orishorn 150 (JBL 2108)
Silvercore 833C for (Klipschorn/Crites)