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...:bigsmile: :yay:
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.....