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HI FI EQUIPMENT We've got musical instruments so the equipment that brings the final sound to life in your home. This forum is for makers etc of speakers and other nifty Hi Fi stuff.

 

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  #16  
Old 18th Feb 2012, 12:19 PM
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Time to put theory into practice do you think it could be built?
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  #17  
Old 18th Feb 2012, 01:00 PM
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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glue ??/ i always have some left over epoxy from carbon fibre builds , so will use some dam expensive glue ( even some out of date stuff) , it will also water proof the partial board , was thinking of "latex rubber " coating the inside of the snail and blow holes
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  #18  
Old 18th Feb 2012, 01:38 PM
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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?
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  #19  
Old 18th Feb 2012, 02:31 PM
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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
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  #20  
Old 18th Feb 2012, 05:14 PM
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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 ?
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