Headphone Reviews

Sennheiser HE 60 headphones: Open-back design. Transducer principle: electrostatic, push-pull. Frequency response: 12Hz–65kHz, –10dB; 18Hz–55kHz, –6dB; diffuse-field equalized. THD: <0.1%.
Weight: 0.6lb. (260gm, less cable).
Serial number of unit reviewed: not available.
Price: $1690 with HEV 70 amplifier (1995); no longer available (2020).

Sennheiser HEV 70 amplifier: Frequency response: 10Hz–20kHz ±1dB. S/N ratio: >90dB. THD: <0.01% (1kHz). Maximum output voltage: 400V. Input sensitivity: 250mV. Input impedance: 10k ohms. Bias voltage: 540V.
Dimensions: 1.5" (38mm) H by 4.5" (115mm) W by 8.5" (216mm) D. Weight: 26.5oz (0.75kg).
Serial number of unit reviewed: 100088.
Price: $1690 with HE 60 headphones (1995); no longer available (2020).

Both: Approximate number of dealers: 1000.
Manufacturer: Sennheiser electronic KG, W-30900 Wedemark, Postfach 10 02 64, Germany. Tel: (37) 0 51 30-600-0. Fax: (37) 0 51 30-63 12. US distributor: Sennheiser, 6 Vista Drive, P.O. Box 987, Old Lyme, CT 06371. Tel: (203) 434-9190. Fax: (203) 434-1759. Web: en-us.sennheiser.com.