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Black semi-open over-ear headphones with self-adjusting headband and leatherette ear pads

Superlux

Superlux FD1YW HD668B headphone

SKU CH-4R8S-64R7F MPN FD1YW

Semi-open 50 mm dynamic drivers with 56 Ohm impedance and 98 dB sensitivity include two detachable cables and weigh 222 g

  • TypeHeadphone
  • ColorBlack
  • Input Impedance56 Ohm
  • ConnectorMini-phone
  • Ear CouplingOver-the-head
  • Patented durable structure built for studio reliability
  • Self-adjusting headband pads give comfortable fit
  • Long-lasting leatherette ear pads for extended sessions
  • Detachable single-side cable with 3.3 ft and 9.8 ft options
  • 50 mm neodymium drivers deliver 10-30,000 Hz response

Professional monitoring headphones

The Superlux HD668B is a semi-open dynamic headphone built for studio monitoring. Its 50 mm neodymium drivers and patented structure deliver a natural, balanced sound with crystal clarity. The 56 Ohm impedance and 98 dB sensitivity suit professional audio work. Light weight at 222 g makes long sessions comfortable.

Thermals noise and power draw

Passive operation means no active cooling, fan noise or electrical power draw from the headphones themselves. The semi-open acoustic chamber vents air naturally during use. Rated input power is 300 mW maximum. Caliper pressure measures approximately 3.5 N for a secure but gentle fit.

Detachable cable and accessories

Two straight single-sided cables are provided: 1 m and 3 m lengths with a mini stereo plug on the headphone end. A gold-plated stereo mini plug connects to the source. A cable clip is included for management. Leatherette ear pads and self-adjusting headband pads complete the package.

Highlights

  • Patented durable structure built for studio reliability
  • Self-adjusting headband pads give comfortable fit
  • Long-lasting leatherette ear pads for extended sessions
  • Detachable single-side cable with 3.3 ft and 9.8 ft options
  • 50 mm neodymium drivers deliver 10-30,000 Hz response

Specifications

BrandSuperlux
SeriesProfessional
ModelHD668B
TypeHeadphone
ColorBlack
Input Impedance56 Ohm
ConnectorMini-phone
Ear CouplingOver-the-head

Questions about this item

How do I install the HD668B and which step do people get wrong?

Plug the supplied 1-metre cable into the mini-phone jack on the left cup, then connect the gold-plated mini plug to your source; the step often missed is seating the twist-lock connector fully until it clicks.

What maintenance or replacement will the HD668B need later?

The leatherette ear pads and the self-adjusting headband pads wear over time; both are user-replaceable, and the detachable single-sided cable can be swapped if damaged.

What limit appears first on the HD668B during sustained use?

The 300 mW maximum input power is the first hard limit; driving the 56-ohm drivers beyond that level risks overheating the voice coils.

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