HD 660 S Open Headphones

Headphones by Sennheiser
HD 660 S Open Headphones


HD 660 S Open Headphones

  • Open backed dynamic headphones
  • Ultra lightweight design for complete comfort
  • Balanced and unbalanced cables
  • Low impedance for use with portable players

Sennheiser’s new HD 660 S is the ideal open, dynamic headphone for the demanding listener. With a crisp bass, excellent mid-frequency response, and a gentle, pleasantly natural treble, the HD 660 S has an expressiveness that immerses you in every emotion and nuance of music. It always stays exceptionally accurate and transparent.

The HD 660 S features a new transducer design with a specially manufactured precision stainless steel fabric. The transducers are carefully selected and paired by hand to ensure consistently narrow (±1 dB) tolerances.

These headphones work really well with many different audio sources thanks to their low impedance. The HD 660 S reveals its full potential when it is connected to the balanced outputs of a dedicated headphone amplifier such as the Sennheiser HDV 820 or to the balanced output of a mobile digital audio player such as the Fiio X7 ii. Accordingly, it comes with a choice of cables for just about any occasion, each made of highly conductive OFC copper.

Listening to the HD 660 S is a pure pleasure because they are very lightweight. The elliptical ear cups are shaped to fit around the ear, while thick padding on the headband and the replaceable ear cushions guarantee hours of listening in complete comfort.

Grahams recommend you partner these headphones with:

Please contact us to arrange a demonstration.

Technical Specifications:

Impedance 150 Ω 
Connector 6.35 mm / 4.4 mm Pentaconn 
Frequency response 10 – 41,000 Hz (-10 dB) 
Sound pressure level (SPL) 104 dB at 1V 1kHz 
Ear coupling Over-ear (circumaural) 
THD + N, total harmonic distortion and noise < 0,04% (1 kHz, 100 dB) 
Transducer principle (headphones) Dynamic, open 
Weight w/o cable Approx. 260 g (without cable)