What are the pros/cons & differences between open and closed cans? What is the rationale or logic behind each design? Thanks.

Has anyone had any problems with the plugs on these, or other cords? Are there dissimilar size & fit amongst headphone cord's plugs? I have a SinglePower Maestro ZR with a Neutrik Locking Headphone Jack. The stock cord on my Senn 650 HP's fits & works fine, but the plug (I've heard a...

I have a maxed out SP Maestro ZR HP amp & Senn 650 HP's. I realize that everyones tastes are different, but in your opinions what HP cables would be the best & why? I have the stock 650 cables & the Silver Dragons. How would the Mobius & other cables compare? Please compare & contrast your...

Should you never touch the glass with your fingers? I know this is true for halogen light bulbs/projector bulbs, as the oils from our skin, left on the glass, leads to premature failure. Is it the same with tubes? Thanks.