I would appreciate any recommendations for a sealed, over-ear, isolating headphone to be used in a relatively quiet open office setting. Priorities in decreasing order are sound isolation (including keeping sound IN), comfort for hours of use, price, and sound quality. I don't like IEM or on-ear...

Consider a push-pull class AB headphone amp. If one half of the bi-polar power supply fails, or if one rail's voltage doesn't mirror the other, a large DC offset will appear on the headphones. How can you protect the headphones without resorting to cap coupling or relays? Solutions relevant to a...