This DIY article will show you step-by-step how to construct completely soundproof, high fidelity headphones using firing-range rated ear protection and high quality headphones. You can literally ride your lawnmower while blowing leaves and chainsawing shrubbery, and all you will hear is Hotel California in your ears.
Wrapping each ear in its own individual sound studio, and completely blocking out exterior sound is pretty shocking the first time you put them on. These headphones sound incredible.
They are so good, in fact, that they can be dangerous. If you build with care as instructed here, you will have built headphones that put you in a bubble, absolutely null to the outside world. You will only be able to hear what's playing through the headphones, and only a visual cue will be able to get your attention. Please remember that it can be dangerous to block out all outside noises.
This will take about two hours from start to finish.
Step 1: Materials
#1 - Firing-range hearing protection
[Peltor President - $15.00] - Great brand, very comfy, most sport a -26 DB rating.
#2 - Headphones
[KOSS KSC-75 - $10.00] - Hands down, the best headphones you can buy under $50
#3 - 6 ft long Red / White stereo cable with 3.5mm mini-plug.
[Any brand - $2.00 or less]
Side note - Don't waste your money on an expensive cable. Things that matter are thickness, how it feels (rubbery, not plastic'y), and a tight 3.5mm connection.
[The quality of your headphones and hearing protection does matter however. I built mine with the above components for $25, and they sound incredible, but you can certainly spend more if you're a real audiophile.]