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DIY (mostly) Isolation Platform
I posted this yesterday as a reply but thought it might have merit as it's own topic.After some Asylum searches and some research, I decided to try a combination of materials for a mostly DIY isolation platform. For about $200 I am very pleased with the results.
Granite, marble and most stone types ring. Ringing is bad. Glass and most metals also ring. Materials that are acoustically dead are the best. A composite of more than one of these "dead" materials is even better.
The platform (19" x 13") is a composite of 4 "dead" materials in 7 layers. It is plexiglas, butyl rubber, aluminium, mdf, aluminium, butyl rubber, plexiglas.
The composite platform rides on 3 bearing blocks. I purchased commercially made bearing blocks.
On top of the platform are 4 Sorbothane footers. My CDP rides on these. On top of the CDP I have bags of #6 lead shot.
Isolation, damping, and mass loading.
The butyl rubber and aluminium came together as an adhesive sheet called V-MAX, used for vibration and sound damping of ducts and machine covers.
Plexiglas 2 x $12
Butyl rubber and aluminium sheets 2 x $14 plus S&H
3/4" MDF $9 (for 1/4 sheet)
FIM bearing blocks 3 for $89 plus S&H
Sorbothane footers 4 x $6 plus S&H
Lead shot $9
Spray adhesive $7I did not put sources because I wasn't sure about Asylum rules. If anybody wants sources, just ask and I'll post.
Also very pleased with DIY Bass Tube Traps made from Knauf pipe insulation, 3/4" plywood and cotton quilt batting. Ears and SPL meter readings verified effectiveness.
Follow Ups:
What type of spray adhesive did you use?
Spray Adhesive - 3M Super 77
This adhesive has known adhesion issues, but in this case there is no strength issue and gravity is on my side.The V-Max butyl rubber/aluminium already has an adhesive (peel off) on one side, so I only used the 3M on the aluminium to MDF bonds.
I used a completely different approach. See my posthttp://www.audioasylum.com/cgi/newbbs.pl?d=Y&forum=tweaks&m=138112
with the only mod being that I centered the weight of 5kg on the spindle of the CD player.
Cheers
Roberto
If the moderators don't like it, they can always delete your second post, but I don't think that they would mind at all.
Here is where I got the parts:Butyl rubber and aluminium sheets 2 x $14 plus S&H - http://www.acousticalsurfaces.com/hvac/duct_vmax.htm?d=26
FIM bearing blocks 3 for $89 plus S&H - http://www.gcaudio.com/cgi-bin/store/showProduct.cgi?id=325
Sorbothane footers - Big Blooz 4 x $6 plus S&H - http://www.tweakshop.com/BlackHolePods.html phone order only 707-575-8626
Lead shot - Knight Red Hot Magnum Lead Shot #6 $8.99 plus S&H - http://www.cabelas.com
Plexiglas 2 x $12 - local glass shop, they cut to 19"x13"
3/4" MDF $9 (for 1/4 sheet)- local lumber yard, they cut to 19"x13"
Spray adhesive $7 - local hardware store
Spray paint (flat black on MDF) - local hardware storePictures to follow, if we can figure out how.
The Bass Tube Traps are made from:
Knauf 1000degree pipe insulation - http://www.knaufusa.com/products/commercial__industrial/pipe_and_equipment_insulation/knauf_1000°_pipe_insulation.aspx
Purchased from Bay Insulation 425-251-6750 (ask for Scott)
$7.47 per foot, they are 3 feet long, 4x3ft plus S&H =$112
10" IPS, 1 " thick = approx 13" outside diameter
Cut 8 x 13" circles from 3/4" plywwod
Adhesive - construction glue (ie - Liguid Nails)
Covered with cotton batting (quilting) and than a cover of gray muslin, they look just like the commercial ones. My son took before and after SPL meter readings (140 readings, 25-200 hz, plotted room grid). They really smoothed out the room's peaks and nulls. Amazing. The four traps cost about $220 for everything.
Thanks for taking the time to list all of these materials.Acoustic surfaces is an interesting place.
The pipe insulation is a great alternative to the Jon Risch cage solution. Thanks!
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