BroadBand Bass Trap's Build - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 175 Old 11-12-08, 11:19 AM Thread Starter
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Re: Bass trap questions

Because I Had A day off I decided to Build Broad Band Bass Trap's For My Rear corners.. I thought It might be good to share with you all How I made Them...
So I took some step buy step photos to help...

To Make my Rear Corners,1770x640 Broad Band Bass Traps the following items is what I used....
CSR BRADFORDS ULTRATEL 2" 1200x2400 semi riged fiberglass cut in half to make 600 X4" thick.. "Must weare Gloves and mask"
2 mtrsx1500mm wide Speaker Grill Cloth (spotlight)
4mtrs Muslenx900mm wide (spotlight)
Wood Pine 2x2.4mtrsx90mmx19mm
8x 40mmx3.5"OD" screws
PVC Glue
80/10mm Bostitch Staples

The Tools I used...
2.4mt Straight Edge (for cutting Fiberglass)
Sharp long bladed stanely Knife or Sharp BREAD knife (any sharp knife will work)
Tape mesure
Makita LS 10.13 Slide Compound Saw
1/4in Trimmer (router)
1x small 1/4" roundover router bit
Air Stapler with 80/10 Staples
Compressor
Bench Drill for counter sink holes
Bosch power Drill
Dewalt 18v DrillDriver
Bosch random orbital sander with 240grit sand disk
Clamps 2x1mt and 4x 60mm

Broad Band Bass Trap Prep
First I measured and cut the 4 pieces of 90x19mm pine (per Bass Trap)
then I cut 4 small triangel corner pieces to give the frame Rigidity
marked out the 2x screw holes per side 8 total to drill with my bench drill (longest Piece)
Drill bit should be the size of the screws(3.5mm)..
lay out the pieces of frame (Dry Fit) clamp so flush and square and drill through the 8x pre drilled holes into the end pieces with A 2.5 to 3mm drill bit screw in screws as you drill each hole but not to tight...

Dissasemble and counter sink holes slightly
lay out frame reasemble one end (clamp) but leave one end out,Apply PVC Glue liberaly to this unasembled end on bothends of the join then clamp checking ends for flush/square and apply the scews tighten..
glue both surfaces liberaly and fit (clamp) 2 of the triangle peaces to the inside of the joins you just glued and screwed together..
Repeate the Same procedure at the other end..
Leave fram clamed to dry for 2 hours minumum..

Next sand the ends and triangle pieces flush as well as the sides/ends
Now route the outside edges top and bottom with A "small" round over Bit

Cut the semi rigid 605/supertel/Ultratel to the inside diamitor of the frame 1200x2400 cut in half=600mm x 4" thick using your straight edge and knife to score the semi rigid Fiberglass with 3 or 4 passes...
Next lay out the 1500wide speaker cloth in half +75mm on the floor taking care that the speaker cloth is folded well
lay the frame on top of the cloth making sure that the frame is equal distant at all sides top bottom, working along the sides strech the fabric up to the back of the frame working from the middle to the ends. The side affect of this will be that the fabric overhang at the ends will pull in A bit allowing us to get mor streach out of the fabric for the sides...

Start from the middel of one side and strech the cloth and staple onto the back of the frame with 3 or 4 staples 2" apart, go to the exact oposite side and do the same strech staple
to back 3-4 staples 2" apart (Dont over strech the fabric)
Repeat this procedure crossing over sides until you get 1" from the end leving that unstapled for now..
Repeat the same above procedure untill ether side is completed...

For the ends start from the middel streching the fabric to the back of the frame with 3-4 staples an inch or so Apart
Go to the corner and fold the fabric so you get A nice even fold and staple in place repeat this fo both corners of this end.. now working from the middel again Strech and staple the fabric to the back of the frame working to the corners (dont over strech fabric)...Repeat the procedure for the oposite end

Flip over your broad Band bass trap to check the fabric has no rinkels or flaws..

Now lay it back down so the Rigid fiberglass is facing up so the Muslin can be fitted to the back..

First get the 4mtrs x 900mm Muslim and fold it long was so it is now 2mtrs x900mm (doubled up)
lay it over the back of the fiberglass so it is at equal distent all the way around besides the end with the fold in the Muslim Make this end flush no over hang
Next Start At the "END" of the bass trap with the Muslim that has the fold make it 5mm before the end and stapel from the middel to the corner
Now fold the Mulim so that the over hang on the "LONG" sides is just covering the inner staples that were used for the Speaker Cloth, Paying attention that the long fold is straight all the way along the back edge of the frame.

Now go to the other end and pull the Muslin tight and staple from the middel out to the sides leaving the staples around 2"apart But not pulling the muslim over tight, Once this is done now start the sides working from one end to the other making sure that as you staple the Muslim fold is around 5mm from the outside edge of the frame you wont need to "STRECH the MUSLIM" for the LONG sides at all.

Your DIY "Pro" Looking Corner Broad band Bass trap is finnished to enjoy...

I will Try to Attach the photos to there correct positions tomorrow (Unless "PROF" wants to do it) But hear they are for now all in one place Cheers.....

BroadBand Bass Trap's Build-1-frame.jpg

BroadBand Bass Trap's Build-2-closeup-speaker-cloth-staple.jpg

BroadBand Bass Trap's Build-3-broad-band-bass-trap-fiberglass.jpg

BroadBand Bass Trap's Build-4-corner-fold.jpg

BroadBand Bass Trap's Build-5-corner-fold-closeup.jpg

BroadBand Bass Trap's Build-6-laying-out-muslin.jpg

BroadBand Bass Trap's Build-8-fold-muslem.jpg

BroadBand Bass Trap's Build-9-staple-muslin-ends-first.jpg

BroadBand Bass Trap's Build-11-finished-bass-trap.jpg

BroadBand Bass Trap's Build-12-close-up-side.jpg

BroadBand Bass Trap's Build-13-closeup-side-fold.jpg

BroadBand Bass Trap's Build-15-air-stapler.jpg

Last edited by cinema mad; 11-12-08 at 07:14 PM. Reason: added more..
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post #12 of 175 Old 11-12-08, 11:23 AM Thread Starter
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jason
 
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Re: Bass trap questions

And the finnished Bass traps in place in the back...

I hope this helps in giving people the motivation to have A go and make some...

Cheers...

BroadBand Bass Trap's Build-14-finished-bass-trap-place.jpg

Last edited by cinema mad; 11-12-08 at 11:31 AM.
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post #13 of 175 Old 11-12-08, 12:07 PM
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Re: Bass trap questions

Now it's measurement time !

Regards,
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post #14 of 175 Old 11-12-08, 04:34 PM
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Re: Bass trap questions

Very good, detailed description Jason...and they turned out alright.
I'm sure your work will be of benefit for anyone contemplating building this type of trap..

I tried the flat panel approach with the large air space behind, for my traps the other night..
I think it did actually show some improvement, particularly in the detail of the lower register, but I only had enough Supertel to make the panels 4" thick..
I'll have to get some more, and try them at 6" thick...

I haven't had any luck in finding that grille cloth material..I'm afraid the female assistants at my local Spotlight have never heard of grille cloth...all they know are dress materials..

I'm still in the middle of re-modelling my theatre, and I'm using up the black stretch material I already had, for the acoustic panels..
I may not have enough to re-do the bass traps, so I'll take another look at it then..

Prof..
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post #15 of 175 Old 11-12-08, 06:59 PM Thread Starter
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jason
 
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Re: Bass trap questions

Hi Prof,
Thanks for the kind Words..

Yes I went with 6" thick on the front corners floor to ceiling and 4" thick for the rear corners from rear riser to ceiling but I also have thick theatre woolen curtains from Jands Audio on the large rear window..

The larger the air gap behined the Broad band Bass traps and the thicker 4"-6" the more coefficent (Supertel Ultratel) they will be in the lower end frequency's thus why I went 690 wide with the front Traps...The air gap has an affect much like using 4"Fiberglass thickness in place of 8" thus saving $$$$ and quadrupling the coefficence of the bass trap in the low frequency's, in that they will obsorb even lower also....

When you inquired about the Speaker cloth at your Spotlight store did you give them the Part No??...

Last edited by cinema mad; 11-12-08 at 07:42 PM.
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post #16 of 175 Old 11-13-08, 05:30 PM
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Re: Bass trap questions

Quote:
cinema mad wrote: View Post
Hi Prof,
Thanks for the kind Words..

Yes I went with 6" thick on the front corners floor to ceiling and 4" thick for the rear corners from rear riser to ceiling but I also have thick theatre woolen curtains from Jands Audio on the large rear window..

The larger the air gap behined the Broad band Bass traps and the thicker 4"-6" the more coefficent (Supertel Ultratel) they will be in the lower end frequency's thus why I went 690 wide with the front Traps...The air gap has an affect much like using 4"Fiberglass thickness in place of 8" thus saving $$$$ and quadrupling the coefficence of the bass trap in the low frequency's, in that they will obsorb even lower also....
Sorry Jason...I should have mentioned that the traps I changed were the rear ones..They were 6" thick, and right into the corners, but the're now 4" thick flat panels with an air space..
The front ones ( which are behind the screenwall ) are 6" thick, floor to ceiling and of the same type construction..flat panels..

Quote:
When you inquired about the Speaker cloth at your Spotlight store did you give them the Part No??...
I've since contacted another branch and at least they know of speaker cloth..
I've given them the part no., but their computers were down at the time..so I've given them my number and I'm just waiting for a call back..

Prof..
Home Theatre...the never ending story!


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post #17 of 175 Old 11-16-08, 10:44 PM
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Re: Bass trap questions

Hi jason,

I've heard back from spotlight and they found the material from the part no.
Unfortunately it's only available from their Geelong store....I have no idea why other branches in major cities don't stock it..

It looks like if I ever need to get any of that material, I'll have to get it through your contact..

At the moment I have enough material to re-do the bass traps..and I've just started re-building them..

Prof..
Home Theatre...the never ending story!


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post #18 of 175 Old 11-17-08, 02:52 AM Thread Starter
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Re: BroadBand Bass Trap's Build

Hi Prof,

What A pain mate, If or when you need some Speaker grill Cloth The Guy you need to talk to's name is Scott in the Dress department Spotlight Geelong Vic as I mentioned in the other post. He offered to ship it to you when I spoke with him...
I think He got it in because of alot of requests so I don't think its A standard line that spotlight carry....

How is your Home theatre coming Along mate ??....
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post #19 of 175 Old 11-17-08, 05:28 PM
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Re: BroadBand Bass Trap's Build

Quote:
cinema mad wrote: View Post
Hi Prof,

What A pain mate, If or when you need some Speaker grill Cloth The Guy you need to talk to's name is Scott in the Dress department Spotlight Geelong Vic as I mentioned in the other post. He offered to ship it to you when I spoke with him...
I think He got it in because of alot of requests so I don't think its A standard line that spotlight carry...
.
Thanks jason..I'll keep that in mind..

Quote:
How is your Home theatre coming Along mate ??....
VERY slowly!!..It's taking longer than I expected..
It's not so much the construction side, but the finishing of the timber panels that's taking the time..
I'm using plain MDF for the soffit trays and columns and I'm applying a timber grained finish to them, using special artists paints..
Each panel has three different applications to get the required timber grain colour and effect..and of course there's a long drying time between each application..

The timber moulding I'm using for the external framing of the acoustic panels is prepainted with a white finish (you may know the type of moulding I'm talking about..it's used for skirting boards ) and this is proving even more difficult and time consuming to change it to a timber grain finish...But I'm slowly getting there and they're turning out quite nice..

So far I've finished two columns, two frames and two acoustic panels..and the soffit trays are up..
I have two more columns,two frames and two acoustic panels to go..and then I start on the new lighting!!..

Prof..
Home Theatre...the never ending story!


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post #20 of 175 Old 11-29-08, 02:15 AM Thread Starter
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jason
 
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Re: BroadBand Bass Trap's Build

I had some spare time on my hands to make Another Broadband trap 2" thick ultratel, to be mounted on the ceiling in the front 1/3 of my home theatre in between and in front of the main speakers ...My plan was to hang the trap with a 2"-4" gap between the trap and ceiling...

Pictures and details to come...

Cheers....
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