In the process of doing a deep cleaning of my basement, I recently dug out my old headphone sound systems which had been sitting dormant for over a decade (Headroom Cosmic amp, Grado HPA-2 amp with PSU, Sony Discman D-335, Grado SR60, Etymotics ER4). I purchased the SR60's new back in 1994 when they first came out. I decided to give them a freshening/upgrade and put them to work with my desktop system (TEAC AI-503, Gallo Micro SE and Sumiko subwoofer). Swapped out the plastic vent screens for Stainless woven wire, went to a single sided 3.5mm jack with removable cable, vented two holes in each driver for a little more base, and of course some new cushions. I had fun with the upgrades and will likely build myself another set with higher end components later.