Braucht der Sennheiser HD 660S2 einen Kopfhörerverstärker?

Ja, praktisch schon. Mit 300 Ohm bleibt der HD 660S2 am Handy zu leise und kraftlos. An einem Kopfhörerverstärker oder DAC/Amp entfaltet er erst seine Dynamik, Kontrolle und Tiefe – wir helfen dir, die passende Quelle zu finden.

Kann ich den HD 660S2 symmetrisch betreiben?

Ja. Neben dem klassischen 6,3-mm-Kabel liegt ein symmetrisches 4,4-mm-Kabel bei. An einem symmetrischen Ausgang gewinnt der Hörer hörbar an Ruhe im Hintergrund und an Kontrolle, besonders im Bass.

Wie unterscheidet sich der HD 660S2 vom HD 660S?

Der HD 660S2 erweitert den Tiefbass deutlich: Sennheiser hat den Schalldruck der tiefsten Frequenzen verdoppelt und dabei die gewohnte Präzision erhalten. Das Klangbild wirkt voller und räumlicher, ohne den ausgewogenen Charakter der Reihe aufzugeben.

Warum den Sennheiser HD 660S2 bei HD Zürisee kaufen?

Weil ein 300-Ohm-Hörer ohne passende Kette nur die halbe Wahrheit zeigt – und wir die ganze für dich aufbauen. Wir stimmen Kopfhörerverstärker, DAC und Verkabelung auf den HD 660S2 ab, mit der Erfahrung aus fast drei Jahrzehnten am Zürichsee. Ruf uns an unter +41 44 680 22 00, schreib per WhatsApp an 076 534 22 00 (nur Text, kein Anruf) oder per Mail an shop@hdzuerisee.ch.

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Sennheiser HD 660S2 Open-Back Over-Ear Headphone

CHF 569.00

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The Sennheiser HD 660S2 is an open-back, high-end over-ear headphone that delivers audiophile sound for a serious chain, thanks to 300-ohm drivers, extended sub-bass and a balanced connector. It takes the well-regarded HD 660S and pushes it audibly deeper into the bass without losing its precision.

Why the HD 660S2?

Inside works a newly vented magnet system with an ultra-light aluminium voice coil, built in Ireland. The result is outstanding impulse response with the finest resolution. The 300 ohms aren't a hurdle here, but an invitation to a good headphone amp - and via the balanced 4.4 mm connector you extract the last bit of quietness and control.

What you hear

A warm, engaging base tone, complemented by significantly extended sub-bass: Sennheiser has doubled the sound pressure of the lowest frequencies while still keeping the balance intact. Against this deeper backdrop, highs sound more brilliant, the stage deeper, and the music simply bigger.

Who is the HD 660S2 for?

For audiophile listeners with a headphone amp or DAC/amp who take vinyl, hi-res and the finest detail seriously. Straight talk: at 300 ohms, a phone stays pale and powerless - without a proper source you'd be buying the HD 660S2 below its worth. And because it's open-back, it's not for the office or the commute.

Our verdict

An audiophile over-ear that combines the best of several worlds: precision, depth and long-session comfort. On the right chain, it plays well above its price. We at HD Zürisee in Wädenswil are happy to put together the right source for you.

What the trade press says: "The HD 660S2 continues this tradition impressively." - hifitest.de, overall verdict "reference class" (5/5 stars), 7/2023.

Technical data

Design: over-ear, open-back
Driver principle: dynamic, open
Driver size: 38 mm
Impedance: 300 ohms
Frequency response: 8 - 41,500 Hz
Sensitivity: 104 dB (1 kHz / 1 V RMS)
Total harmonic distortion (THD): < 0.04 % (1 kHz / 100 dB)
Connector: 6.3 mm and 4.4 mm balanced; 6.3-to-3.5 mm adapter
Cable length: 1.8 m
Origin: Ireland
Weight: 260 g
Included: HD 660S2, 6.3 mm cable and 4.4 mm cable (1.8 m each), 6.3-to-3.5 mm adapter, carry case

Frequently asked questions

Does the Sennheiser HD 660S2 need a headphone amp?

Yes, practically speaking. At 300 ohms, the HD 660S2 stays too quiet and powerless off a phone. It only unfolds its dynamics, control and depth with a headphone amp or DAC/amp - we'll help you find the right source.

Can I run the HD 660S2 balanced?

Yes. Besides the classic 6.3 mm cable, a balanced 4.4 mm cable is included. On a balanced output, the headphone audibly gains a quieter background and more control, especially in the bass.

How does the HD 660S2 differ from the HD 660S?

The HD 660S2 significantly extends the sub-bass: Sennheiser doubled the sound pressure of the lowest frequencies while preserving the usual precision. The sound image feels fuller and more spacious, without giving up the balanced character of the line.

Why buy the Sennheiser HD 660S2 from HD Zürisee?

Because a 300-ohm headphone without the right chain only shows half the truth - and we build the whole picture for you. We match headphone amp, DAC and cabling to the HD 660S2, with nearly three decades of experience on Lake Zurich. Call us on +41 44 680 22 00, message us on WhatsApp at 076 534 22 00 (text only, no calls) or email shop@hdzuerisee.ch.