they just change the sound a little ju ju and make the box a little louder but mostly i put them there to be able to hold the d-bow cause it is only 2 in. wide. i attached the tubes at the top and bottom with removeable screws.i can cap off the tubes or leave them open. changes the sound acousticly if they are capped off.
thanks fer the comments fellers,i will do a video with this little box spencer. ets you are welcome to use any ideas that i have used at any time you like.
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juju.