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  • Home
  • Piano Suite
  • Studio Views
  • Discography Recordings
  • Demo Recordings
    • Classical
    • Graduate/Undergrad Applications
  • Control Room + Monitoring
  • Microphones
  • Bio and Studio Conception
  • Contact Info - Studio Rates
  • Live/Remote Recording
  • Bop Stop Blog Spot

Part IV - Acoustic Treatment Development - Implementation - FINISHED Quadratic Residue Diffusers and Flexifuser

9/15/2014

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WHEW!!!!!!  I finally finished two of the FIVE 2x4' Quadratic Residue Diffusers! 


It was a long hard fought battle, as those who have ventured know you want to quit at several points.  These are built with stained Birch frames and the inner fins and wells are MDF.  The precision cutting, sanding, and finish work is the most time consuming aspect.  These are 10 inches deep, so deeper than what is generally commercially available, diffusing lower frequencies than with the typical 5 inch depths.  I added legs and stacked the two in the corner directly in front of a stacked 8x2 ' x 6 inch broadband absorption with corner fill behind it.  I don't know exact time, but for sure at least 40 hours for these two or more.  So it becomes evident why it would cost about $1600 for these two if bought commercially and sadly the quality of build and materials would be LOWER!  
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A finished 4x2' 5 inches deep combination absorption/diffusion FLEXIFUSER.  It has scattering properties from the hardwood front panels and it has 3-4 inches of broadband absorption behind it.  Again, it will be placed in front of a stacked 8x2 section of broadband absorption with corner fill behind it.  The next stage is to add to the TOP of this FLEXIFUSER, FOUR 15x15" skyline diffusers.  In previous posts I showed the cutting for the pieces for the skyline, so I will finally get to sanding, finishing and mounting all the 400+ pieces.  Should complete that part of the back wall in the tracking room.
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Please stay tuned for updates on the NEVER ENDING Quest for acoustic perfection.  
Skyline diffusers, finishing and mounting T fusers, mounting ceiling clouds etc.... are all on the way!! 
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Part III Acoustic Treatment - Building Quadratic Residue Diffusers, Primitive Root Diffusers, and finishing T-fusers

8/8/2014

1 Comment

 
SO just to update my ongoing acoustic treatment implementation and development.

Here you will see finally the finished three QRD stack made up of two units purchased from RPG and a custom bottom larger QRD.  It ended up being 9ft and 6 inches tall!!!! Let me say, me and my wife lifted the top two QRD section with the added Period wings and it was about 60+ lbs alone onto the bottom QRD and wedged it between the two stabilization brackets on the sides.  Once we lifted it I really didn't think we were going to be able to do it and I suddenly had immediate visions of a trip to the emergency room as this thing was heavy and if it fell we would be at the hospital for sure.  None the less it is done.  The back section is 6 inch thick Broad band absorption panels.
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OK, so here are the purchased Skyline Primitive Root diffusers purchased from SoundArt.  They were kind of yellowish in the original state.  I began to spray finish these with white primer, must be water based, which I prefer for clean up reasons.  Well, as many have mentioned these type of diffusers just suck up paint and finish.  This after 5-6 coats of sprayed white primer.  I will apply another 5-6 coats looks like, whew.  Even with my new hi volume low pressure spray machine, this takes lots of time and paint!!  Getting close and still debating painting them black or just keeping them white, but they will be mounted into stained wood frames.
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Next are SIX Auralex T-Fusers.  They were WHITE originally and now they are STILL WHITE, but this is an oil based primer, they I sprayed on very light coats.  It looks really nice and flat.  I will paint these flat black next.
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OK, so this is for those who like MDF finishing and pure wood staining.

First is the raw cut sanded MDF boards that will be the 4'x10"x.5" WINGS for the QRD.  You can see them go from light brown to three coats of white primer, with sanding in between.  This was a lot of work, but it is not easy to get MDF nice and smooth on the cut edges.  I used oil based primer, can't be water based.  Then I sprayed a water based Black flat paint, but was learning how to use my new paint machine, so it was thick and had to brush it.   This is just the first coat, but already looks pretty good.  I will apply one more to all sides. 

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Last is the outer frame of the QRDs, which will be stained Spruce.  
You can see the first coat of miniwax golden oak stain.  and the finished second coat.
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Thats all for now, but I promise next time I will have at least one of the FOUR huge 4'x2'x10" black and stained wood QRDs done, finish the Q-fusers, and also be done with the Skyline PRDs.  So there will be more finished products to look at!!!!!  
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