{"id":69461,"date":"2025-08-18T06:56:00","date_gmt":"2025-08-18T06:56:00","guid":{"rendered":"https:\/\/staging.oztechemporium.com.au\/?post_type=product&#038;p=69461"},"modified":"2026-09-10T04:23:06","modified_gmt":"2026-09-10T04:23:06","slug":"sennheiser-hd-660s2-wired-audiophile-stereo-headphones","status":"publish","type":"product","link":"https:\/\/staging.oztechemporium.com.au\/?product=sennheiser-hd-660s2-wired-audiophile-stereo-headphones","title":{"rendered":"Sennheiser HD 660S2 Wired Audiophile Stereo Headphones"},"content":{"rendered":"<h2 dir=\"ltr\" data-pm-slice=\"0 0 []\">Sennheiser HD 660S2 \u2013 Available at OzTech Emporium in Australia<\/h2>\n<p dir=\"ltr\"><strong>Legendary Audiophile Sound with Enhanced Bass<\/strong><\/p>\n<h2 dir=\"ltr\">Precision Audio &amp; Comfort<\/h2>\n<p dir=\"ltr\">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\u201341.5kHz 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 &lt;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.<\/p>\n<h2 dir=\"ltr\">Connectivity &amp; Compatibility<\/h2>\n<p dir=\"ltr\">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.<\/p>\n<h2 dir=\"ltr\">Build &amp; Features<\/h2>\n<p dir=\"ltr\">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.<\/p>\n<h2 dir=\"ltr\">Buy at OzTech Emporium<\/h2>\n<p dir=\"ltr\">OzTech Emporium offers the Sennheiser HD 660S2 in Australia, with stock varying due to high demand.<\/p>\n<h2 dir=\"ltr\">Why OzTech Emporium?<\/h2>\n<p dir=\"ltr\">100% authentic Sennheiser devices with local warranty. Secure, rapid Australia-wide delivery. Expert customer service and after-sales support.<\/p>\n<p dir=\"ltr\">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.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-69662 size-full\" src=\"https:\/\/oztechemporium.com.au\/wp-content\/uploads\/2025\/08\/Sennheiser-HD-660s2-SPECS.webp\" alt=\"\" width=\"583\" height=\"734\" \/><\/p>\n","protected":false},"featured_media":110573,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[1602],"product_cat":[1232,1603],"product_tag":[],"class_list":["post-69461","product","type-product","status-publish","has-post-thumbnail","product_brand-sennheiser","product_cat-earbuds","product_cat-sennheiser","first","instock","sale","shipping-taxable","purchasable","product-type-variable","has-default-attributes"],"acf":[],"_links":{"self":[{"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=\/wp\/v2\/product\/69461","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=\/wp\/v2\/product"}],"about":[{"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=69461"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=\/wp\/v2\/media\/110573"}],"wp:attachment":[{"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=69461"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_brand&post=69461"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_cat&post=69461"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.oztechemporium.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_tag&post=69461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}