Tunable "Open/Closed" Headphones

pinshape

This is roughly modeled on the style of 60's and 70's headphones manufactured by Lenco in Switzerland. Sick of headphones that are designed to fail, I was inspired to design this, where any part can easily be replaced in relatively short time. Print Settings: Printrbot Simple Metal Rafts: No Supports: Yes Resolution: 0.2 Infill: 20% Notes: Disable small gap-fill for ALL printed parts, and use 3 perimeters. Open Earcups: Print the earcups open-end down, put supports up to the "socket" at the back of the cup. Closed Earcups: Print earcups large open-end down, print the back plate logo side down. Arms: The print settings should allow for a small 0.2mm gap in the middle of the arm structure, which is for the "flex". You will also need to fill the bolt-slots in the slotted upper-arms with supports. Front Baffle: Adjust the baffle to fit your speakers / drivers. Design and print adapter rings with an outer diameter of 42mm on which to place your driver, so the diaphragm is clear of the grill. Your adapter ring should have a inner diameter equal to your driver outer diameter + 0.25mm, and an outer diameter of exactly 42mm. Post-Printing Assembly: Start with the upper/slotted arm and earcup arm, using a 4mm screw, washers, and locknut. Repeat for attaching the arms to the earcup. Then use a bolt and locknut for headband to attach to the upper arms. Insert wiring, Glue driver to the front baffle, solder cables to drivers, remembering to run the wire through the correct holes. Also leave a little play on the wire which goes from left to right earcup. Cushions: Use standard AKG earcup cushions which are roughly 100mm across. K240 or K271 compatible ones work well. I liberated the headband cushion from an old pair of Shure headphones for the headband. There are "generic" ones on ebay which button up over the headband also. Sound Tuning: The front baffles come in two versions, vented and closed, vented is tunable to reduce bass. Cover vents one by one to increase bass as desired. Also experiment with material between the baffle and the ear, like felt or sponge. See: http://www.brentbutterworth.com