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BroadBand Bass Trap's Build

86K views 174 replies 15 participants last post by  jrisles 
#1 · (Edited)
For Any One that is interested in Building there own PRO LOOKING :bigsmile: Corner Mounted BroadBand Bass Traps take A look down A few posts for Some Ideas and What I came UP with.....


I went with Ultratel 50mm thick 1200x2400 semi rigid fiberglass for my bass traps the packs came in lots of 3 sheets per pack, it's very pricey at A retail price of over $300 per pack :yikes:, I was luckily able to get the Ultratel direct from bradfords :bigsmile:.... I made my Bass traps 8ft high X 690mm wide and 6in thick (3 layers),I put them across the corners so ended up with an air gap being 16in out from the wall corner to the front of the trap's.. Here are some pictures of the front Bass traps.....

Hope this helps....

Cheers.....
 
#35 ·
Thanks Prof,

To stain the Tasman Oak hard wood I used 500ml Wattyl professional stain "Black" and the clear Gloss was 1lt Wattyl Estapol Gloss, Polyurethane Based... Purchased from Bunnings

I loved the red wood stains but wouldnt go with my Black walls, I dont want the Diffusors to stand out to much...

Cheers....
 
#37 ·
Couple of Pictures of A ROUGH setup to give you an idea of where and how they will be placed, In the Final setup The Diffusors will all be custom cut to fit the exact hight/length needed for A perfect fit...

It is important to note that The Flutter Echo tiles will be placed at Ceiling hight and one 4" wide continuous Diffusor will be hung horizontaly at the top where the ceiling and side walls meet and slightly tilted down all the way along the left and right side walls in the room, underneath them the diffusors will be hung Verticaly in carefully chosen places.....

IMO Diffusion is often overlooked by most & is just as important as Absorbtion, and can be as affective if applyed correctly....
QUOTE "Its Application converts small rooms with flat parellel sufaces into functional spaces with good SPEECH INTELLIGIBILITY, SOUND QUALITY,AND A NATURAL,COMFORTABLE AMBIANCE....

The down side of Diffuson is that it is much more complexed to design build and apply than Absorbtion and it costs more to manfacture....

Cheers....:T
 

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#39 ·
Hi Mike And thanks for your complement...

I only put them up today Roughly so I could post pictures, so I have'nt put them through there paces But I left them in place for now because I Have Eagle EYE on Blu-Ray so I will let you know what I think....

I have to make heaps more to the required length before I can install them permanetly and
so they hopefully look like they belong, unlike the above picture of the Diffusors placed around the surround speakers ... I got another 20mt of Tasman oak today and have already used around 15mt :thud: I would say I will end up using 40-50mt of the stuff :eek:....

Cheers....
 
#43 · (Edited)
Hi Prof, & thanks for your post...

I have A two stage riser with two rows of seating, so I set up first reflection absorbtion for both... The idea is that between the 2 reflection points you can have Diffusion this is one place where my Advanced BroadBand QRD nested Diffusors will be placed for the higher performance once built...With this type of Diffusor the seating position should not be any closer than around 6ft Due to Well depth....

For the picture I put the flutter Echo diffusors in this position to show where they can be placed But as pictured above they will be placed mainly around the surround speakers with A small amount of absorbtion and where the side wall and ceiling meet. So that is why I whent gloss but I totaly agree with you Prof that if they were permanatly placed between the first reflection points that flat black is more appropriate...

Cheers....
 
#51 ·
Yes A very handy piece of gear but very messy :thumbsdown: and very very Dangerous like all planers.....

FWIW That Ryobi Surface planer was made in 1995 when Ryobi was OK but all the new Ryobi stuff is mostly rubbish now IMO, Disposable power tools ......

Cheers....
 
#53 ·
Unfortunately it's not just Ryobi.
I have a mate who repairs power tools and he recommends buying old tools >10yo and repairing them.
You name the brand & there is a 90% chance it isn't made to last more than its warranty plus 1 day.
There are still a few good ones out there if you look hard enough! and are willing to pay.

Personally I hate the fact that the rest are just going to end up as toxic landfill..........
my 2c
 
#54 ·
Yes I agree with your mate as far as the older Ryobi stuff being good quality, But The problem being that A lot of the parts for 10y + Ryobi power tools are No Longer Available Thus can't be repaired unless you custom make the parts needed...

FWIW I to used to Repair all heavy industrial and power Tools inc Electrical rewinds IE: Remanufacturing/ Rewinding Armatures, Stators and more in house for over 10 years....

Unfortunatly these cheap Chinese manufactured power tools are now disposable items, It costs more to repair these tools than replace which is what Ryobi/ Black&Decker (dewalt), to name A few do for warranty claims :yikes:....

Cheers....
 
#57 · (Edited)
Yes Prof I am hopping they will look good, But as noted they are A nightmare to make...

FWIW I have been talking to Doug Plumb of Acoustisoft.com about the Excellent RplusD Room Acoustic measurement software (Ethan of real traps uses it) so I can optimize my room Acoustics, this includes speaker placement, EQ Subwoofers and "Room treatment placement" & much more....

I am going to "cheat" and use his 1 on 1 Consultation package, I figure that it would be better to use his knowledge & Expertise for the best result rather than me having to learn how to analyze & interpret what the Data is telling me + I am A very impatient :hissyfit: person when it comes to this stuff so that works against me also...


Has any one here used this High End room Acoustic software ?....

Cheers....
 
#59 ·
Hi Fred & thanks for your post :T,

This type of QRD Diffusor's coefficient range is usefull between - 3500hz --- + 20000hz..
If you mount these Diffusors with A space and air cavity combined with Semi riged fiberglass, absorbtion below the Diffraction limit can be achieved.....

:T Because the Well depth is only small they can be placed closer to the listner which is the biggest plus as compared to QRD Diffusors with 6" deep or deeper wells....

:thumbsdown: The Down side to this Diffusor is its smaller Diffusive frequency range as compared to A BroadBand Diffusor such as the type I will build later down the track....

Cheers....
 
#60 ·
Thanks Jason. I suspected that it would be higher in frequency. I would like to try some diffusion at the first reflection points on the side walls and this looked like a possible candidate. I think that with the smaller wells, they could look quite elegant.

I need to go back and re-read that section of the Master Handbook.
 
#62 · (Edited)
Finnished 4 diffusors & frames 2x4ft & 2x3ft with 4 Flutter Echo tiles per frame...
They will be hung slightly angled down.. They are mounted from A peace of 25mm x 32mm hard wood screwed into the stud of the wall then the mount on the back of each frame is simply hung off it....But the Diffusor mount is not fixed in place on the back of frame untill I check were the wall studs are so I can determine exactly where to mount it to the back...

I will mount them tomorrow and post some pictures of them in place & now that I have Acoustisofts RplusD software I will be able to check the theatres acoustic performance & placement of my room treatments thus far :daydream:....

Cheers...
 

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