Sennheiser HD 660S2 Wired Audiophile Stereo Headphones

Sennheiser HD 660S2 – Available at OzTech Emporium in Australia

Legendary Audiophile Sound with Enhanced Bass

Precision Audio & Comfort

The Sennheiser HD 660S2 feature 38mm high-performance transducers with an ultra-light aluminum voice coil, delivering natural, balanced sound with extended sub-bass, precise mids, and smooth treble across an 8Hz–41.5kHz frequency range. Optimized airflow and a revised 300-ohm coil double the sound pressure at low frequencies (e.g., 27.5Hz piano notes or 45-60Hz bass drum kicks), retaining clarity without distortion (THD <0.04% at 1kHz, 100dB). The open-back design offers a spacious soundstage but leaks sound, unsuitable for noisy settings. Weighing 260g, the over-ear headphones include plush velour earpads and an ergonomic headband for comfort during long sessions, though some note mild warmth.

Connectivity & Compatibility

Equipped with detachable 1.8m cables (6.3mm unbalanced and 4.4mm balanced) with para-aramid reinforcement, the HD 660S2 connect to hi-fi systems, DACs, or amps. The 300-ohm impedance requires a robust source for optimal performance, though portable devices can drive them at moderate levels.

Build & Features

Designed in Germany and made in Ireland, the HD 660S2 feature a vented magnet system with steel mesh damping to minimize distortion and a 70Hz resonant frequency for enhanced bass response. The package includes a carry pouch, cables, and adapter, though some wish for a hard case. The open-back design and lightweight construction prioritize soundstage over noise isolation, ideal for quiet environments.

Buy at OzTech Emporium

OzTech Emporium offers the Sennheiser HD 660S2 in Australia, with stock varying due to high demand.

Why OzTech Emporium?

100% authentic Sennheiser devices with local warranty. Secure, rapid Australia-wide delivery. Expert customer service and after-sales support.

The Sennheiser HD 660S2 deliver reference-grade audio with deeper bass and exceptional clarity, perfect for audiophiles seeking an intimate listening experience. Grab yours at OzTech Emporium while available.

When you purchase a brand new device, you’ll find everything what comes in the original box. However, if you have bought a used device, you’ll find everything you need to get started right in the box.

Included are the device itself, a USB charging cable, and a charging power adapter to keep your device powered up. You’ll also receive a SIM ejector tool for easy setup. Everything is packed to ensure you’re ready to enjoy your new device right away!

Warranty

Australian variants of all the brand-new products carry a 2-year manufacturer warranty under Australian consumer law. The non-Australian variants come with a 1-year seller warranty. You must contact our customer care centre to claim your warranty.

For used products, we offer a 1-year warranty (conditions apply) for private households from the date of shipment (3 months of commercial use). If a defect arises and we receive a valid claim, we may, at our option, repair or replace the product.

As per the ACCC’s regulations, we will resolve the minor issues found in our phones with either repair or replacement, as the case may be. However, there will not be any refunds on purchases made under the buy-now-pay-later model using methods like After Pay, Zip Pay, Latitude Pay, etc.

We will replace your item if it is found to be Dead on Arrival (DoA) within 7 days of dispatch. Any DoAs must be communicated/returned to us within 7 days.

Before returning any item, you must contact our Customer Service Department.
If an item needs to be returned for warranty after 30 days from the dispatch date, postage for both ways will be at the buyer’s expense.

You are responsible for ensuring the product is packaged securely to prevent any damage during the return of the item. Failure to do so may affect the ultimate resolution, which may include repairs, replacements or store credit.
Accessories and bonus gifts are not covered by warranty. Examples include batteries, earphones, cables, carry bags etc.

Naturally, the warranty cover does not extend to damage caused by normal wear and tear, accidents, misuse, lack of maintenance, neglect, natural disaster, or other external causes; to damage caused by operating the equipment in a manner outside that described in the instructions. The warranty is considered void if the item has been modified, altered or tampered with by a person (or persons) not authorized by our store to provide service (not including standard periodic maintenance).