new box... check it out
05-13-2005, 11:49 PM
#12
nice job Lessy...make sure to fill the corners with something more solid than foam... the foam will absorb some of the resonance of the weak cardboard tubing... so use something solid or maybe use spray foam but stick chunks of 2x4 into it
05-14-2005, 05:20 AM
#13
oh god...don't be a hack and don't use expanding foam AT ALL...what you do it glue around the seams of the cardboard and make sure you have a perfect seal and then get some fiberglass resin and mix it up and then add it to a whole bunch of play sand and pour it in...you could use straight resin but it would be weaker and way more expensive since sand is cheap. If I have learned one thing in SPL anything hollow in the box is BAD
05-14-2005, 05:24 AM
#14
or and after you are done that it would be even better to take the cardboard out completely and cover the fiberglass/sand area with bondo and sand it till its smooth with a series of flexible abrasive discs on a angle grinder
05-14-2005, 07:44 AM
#18
There is actually a way to bend MDF but the page i used to do it right actually disappeared on me.
If you cut plenty of parallel lines parallel to the part you wish to bend. You can experiment which how far apart the lines are and how many you use to make a semi circle with the radius you want.
If you cut plenty of parallel lines parallel to the part you wish to bend. You can experiment which how far apart the lines are and how many you use to make a semi circle with the radius you want.
05-14-2005, 02:37 PM
#19
bending is a pain in the butt...concrete could be used except then you wouldn't be able to remove the cardboard which would make it not as good...of course this is because concrete won't bond to the wood like resin will and can't be applied in layers as thin without breaking so as it gets close to the outside of the curve where it gets very thin it will break. Although it is cheaper...and of course another downside is that the MDF will soak up the water from the concrete and swell like a bitch
05-14-2005, 02:40 PM
#20
oh and filling it with sand and sealing it off isn't great as it won't be as dense as if you mix the resin in as sand will still have bits of air trapped in it and will actually serve to deaden the sound whereas with the resin reinforcing it it will reflect the sound...there is a way to do it and a way to do it right you have been warned lol
