Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Page 2 of 2 FirstFirst 12
Results 16 to 20 of 20
  1. #16
    Join Date
    Dec 2011
    Location
    Brisbane
    Posts
    454

    Default

    Time to put theory into practice do you think it could be built?

  2. # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many





     
  3. #17
    Join Date
    Nov 2006
    Location
    Darwin HowardSprings
    Age
    47
    Posts
    1,197

    Default

    Quote Originally Posted by HeadScratcher View Post
    Time to put theory into practice do you think it could be built?

    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glue ??/ i always have some left over epoxy from carbon fibre builds , so will use some dam expensive glue ( even some out of date stuff) , it will also water proof the partial board , was thinking of "latex rubber " coating the inside of the snail and blow holes

  4. #18
    Join Date
    Dec 2011
    Location
    Brisbane
    Posts
    454

    Default

    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?

  5. #19
    Join Date
    Nov 2006
    Location
    Darwin HowardSprings
    Age
    47
    Posts
    1,197

    Default

    Quote Originally Posted by HeadScratcher View Post
    Do you have any decent test gear to measure the results?

    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

  6. #20
    Join Date
    Nov 2006
    Location
    Darwin HowardSprings
    Age
    47
    Posts
    1,197

    Default

    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 ?

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Nautilus sailing canoe
    By woodeneye in forum MISC BOAT RELATED STUFF
    Replies: 1
    Last Post: 20th Mar 2010, 06:47 PM
  2. A Few Things to Download
    By Chris Parks in forum WOODWORK - GENERAL
    Replies: 13
    Last Post: 18th Jun 2008, 02:49 PM
  3. Christmas Nautilus
    By woodbutcher in forum BANDSAWN BOXES
    Replies: 16
    Last Post: 5th Jan 2008, 10:28 AM
  4. speakers on?
    By jow104 in forum NOTHING AT ALL TO DO WITH WOODWORK
    Replies: 1
    Last Post: 20th Nov 2007, 07:51 PM
  5. IE6 download
    By PaulS in forum NOTHING AT ALL TO DO WITH WOODWORK
    Replies: 6
    Last Post: 15th Aug 2005, 11:58 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •