Sennheiser Orpheus HE 90 - User Manual

Details the push-pull electrostatic transducer technology used for optimal sound reproduction.

Explains the electrostatic principle, diaphragm, and electrode design for clarity and minimal distortion.

Covers the construction of earpieces, earpads, and headband for comfort and acoustic neutrality.

Describes the 6-core OFC cable, 5-pin plug, and locking mechanism for connecting the headphones.

Details the use of preselector and output stage valves in a bridge circuit for high modulation and low distortion.

Explains the bit-stream converter, MD C-core transformer, and volume control for superior audio quality.

Covers digital/analogue inputs, output sockets, chassis materials, ventilation, and wood frame design.

Highlights the hand-made nature and limited worldwide edition of 300 for the Orpheus combination.

Details power supply, input selection, headphone connection sockets, and volume control operation.

Covers valve handling, ventilation requirements, moisture avoidance, and VDE safety compliance.