Thanks: 0
Likes: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 16 to 20 of 20
-
18th February 2012, 11:19 AM #16Senior Member
- Join Date
- Dec 2011
- Location
- Brisbane
- Posts
- 454
Time to put theory into practice do you think it could be built?
-
18th February 2012 11:19 AM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
18th February 2012, 12:00 PM #17
so easy its not funny , it will take a while , each sheet might be 1 hour in the CNC , but ill just run them while im working on my violin
a lot of glue ??/ i always have some left over epoxy from carbon fibre builds , so will use some dam expensive glue ( even some out of date stuff) , it will also water proof the partial board , was thinking of "latex rubber " coating the inside of the snail and blow holes
-
18th February 2012, 12:38 PM #18Senior Member
- Join Date
- Dec 2011
- Location
- Brisbane
- Posts
- 454
Well if you decide to go ahead and give it a go I will be watching with interest to see the results. Do you have any decent test gear to measure the results?
-
18th February 2012, 01:31 PM #19
got a set up for violins , should work the same , run the speaker at set hz , use salt to see the patterns forming on the sides , the salt moves to the "nodes" area's of least movement , then i have a record player head , set up to record vibrations ,where the salt shows you ( where the salt isnt ) , so can tell what hz the box is vibrating at for each wave length the speaker is humming at , but dont have a decent mic (db accurate )
i use voice recognition soft ware for my violins , not just the spectrum analyser , its a lot easier to understand
the setup has one PC running a tone generator ( CNC's PC ) with voice recognition showing its out put ,on screen . its sound card is a 24bit , thats amped to 90watts per channel ,
the record player head runs through a preamp into a second PC with the same sound card to show a voice recognition pattern of what it saw , between the 2 screens its easy to see the difference ( yer i have PC's in my shed , LOL , 3 of them )
i place a finished violin between 2 speakers ( one is wired up wrong ) so the violin is forced to vibrate in time to the tone , the violin adds its acoustics to it , and the record player head on the bridge picks up what the violin is playing , i can then attack the bridge with a gouge to fine tune the loudness of each string , im playing them backwards because i cant play them ,
the speakers move the violin up and down , while the record player head only picks up side to side movement of the bridge , there is no feed back , and the its only the note being played has a spike , its under tones are the same as if it was played by a bow , i do have to clamp a string to the corresponding note , the spot is easy to find because the string vibrates in tune when the clamp is move into position, i open up mutable tone generators to test cords
at 90rms , its easy to make it wolf tone from way too much power ,its good , lets me see how far off i am from a wolf tone , a player would destroy the bow if they played that hard , tried to brake a string once and had all my neighbours complaining , "e" that loud sent me cross eyed
also experimenting with bouncing a IR laser off mirror tape to find out what hz the "tags" next to the F holes vibrate at , if you touch them they slow down , at the moment i use a pencil with an eraser on the end , touch the tag and see what area of the image stops
-
18th February 2012, 04:14 PM #20
just got me thinking , find the node points of the sides of the box , and mount it by those node positions ( where is not vibrating ) , inside the outer shell of the speaker box
lay the speaker on its side , pump a fixed tone into it , shake on some salt , when it forms lines , mark the lines with hz referance , and go up to the next note and repeat , once you cover the range that the cross over will be supplying ,, look for a spot where the nodes are all the the time , or best spot , and thats your fixing position , ??? a rubber mount around the speaker hole to stop vibration ?
Similar Threads
-
Nautilus sailing canoe
By woodeneye in forum MISC BOAT RELATED STUFFReplies: 1Last Post: 20th March 2010, 06:47 PM -
A Few Things to Download
By Chris Parks in forum WOODWORK - GENERALReplies: 13Last Post: 18th June 2008, 02:49 PM -
Christmas Nautilus
By woodbutcher in forum BANDSAWN BOXESReplies: 16Last Post: 5th January 2008, 10:28 AM -
speakers on?
By jow104 in forum NOTHING AT ALL TO DO WITH WOODWORKReplies: 1Last Post: 20th November 2007, 07:51 PM -
IE6 download
By PaulS in forum NOTHING AT ALL TO DO WITH WOODWORKReplies: 6Last Post: 15th August 2005, 11:58 PM