{"title":"Sennheiser","description":"\u003cspan style=\"font-weight: 400;\"\u003eSennheiser is one of the most well-known brands among audiophiles and music lovers worldwide. It's a three-generation family-owned business that's been perfecting its craft since 1975. As a well-established brand in the present, they've got their eyes on the future of music. They want to shape the future of music by creating a uniquely memorable and revolutionary sound experience for their users. Their design is propelled by an intense passion for audio, emotion, art, and science.  Sennheiser wants the sound to be truly felt in every aspect of life, so they created a varied range of equipment spanning live audio, home theatre, music, and even conferences.\u003c\/span\u003e","products":[{"product_id":"sennheiser-reference-circumnaural-headphones","title":"Sennheiser HD-800S Reference Circumnaural Headphones","description":"\u003cp\u003eThe \u003cstrong\u003eSennheiser\u003c\/strong\u003e HD-800S \u003cstrong\u003eopen-back circumaural headphones\u003c\/strong\u003e are engineered for critical reference listening and high-fidelity music reproduction. Utilising an open-back acoustic architecture alongside proprietary 56mm Ring Radiator transducers, these on\/over-ear headphones direct sound waves at a calibrated angle to present an expansive, three-dimensional sound field. The acoustic configuration replicates the natural dispersion characteristics of stereo loudspeakers, providing precision spatial localisation for discerning audiophiles.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eWearing the HD-800S redefines how spacious personal audio can feel in a home listening environment, removing the enclosed sensation typical of conventional headphones. The open earcups allow air and sound to circulate unhindered, rendering complex musical arrangements within a coherent, wide physical space. Its lightweight aluminium and aerospace-grade chassis rests comfortably during prolonged evening listening sessions, letting you focus entirely on delicate nuances across high-resolution recordings.\u003c\/p\u003e\u003ch3\u003eKey Acoustic \u0026amp; Design Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRing Radiator Transducers:\u003c\/strong\u003e Large 56mm drive units project linear, low-distortion audio directly angled into the ear canal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAcoustic Absorber Technology:\u003c\/strong\u003e Internal dampening neutralises high-frequency resonance spikes to preserve low-level acoustic details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAerospace-Grade Construction:\u003c\/strong\u003e High-rigidity chassis elements and microfibre ear cushions maintain structural stability while minimising physical fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorised Dealer Support:\u003c\/strong\u003e As an official Sennheiser authorised dealer, Hi-Fi Centre provides full manufacturer warranty coverage, certified authenticity, and ongoing support.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e Sennheiser HD-800S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign Principle:\u003c\/strong\u003e Dynamic, open-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEar Coupling:\u003c\/strong\u003e Circumaural (over-ear)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Size:\u003c\/strong\u003e 56 mm Ring Radiator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 4 Hz – 51,000 Hz (-10 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Impedance:\u003c\/strong\u003e 300 Ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion (THD):\u003c\/strong\u003e \u0026lt; 0.02% (1 kHz, 1 Vrms)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound Pressure Level (SPL):\u003c\/strong\u003e 102 dB (1 Vrms at 1 kHz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Cabling:\u003c\/strong\u003e 6.35 mm unbalanced stereo cable, 4.4 mm Pentaconn balanced cable (3 m)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approximately 330 g (without cable)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDo the Sennheiser HD-800S headphones require a dedicated headphone amplifier?\u003c\/strong\u003e\u003cbr\u003eYes. With a high nominal impedance of 300 Ohms, the HD-800S requires a capable dedicated headphone amplifier or high-voltage DAC\/amplifier stage to achieve sufficient dynamic headroom, optimal transient response, and precise bass control.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre these headphones suitable for tracking or use in noisy environments?\u003c\/strong\u003e\u003cbr\u003eNo. Owing to their fully open-back architecture, the HD-800S headphones provide minimal passive noise isolation and naturally leak audio outwards. They are engineered strictly for critical mastering, reference studio work, and critical listening in quiet private spaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the benefit of the included 4.4 mm Pentaconn cable?\u003c\/strong\u003e\u003cbr\u003eThe 4.4 mm balanced cable enables direct connection to balanced headphone amplifiers and digital audio players. Balanced drive architecture mitigates common-mode interference and cross-talk, preserving channel separation and maximising spatial resolution.\u003c\/p\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":43819671683125,"sku":"HD-800S","price":2399.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2246\/9355\/files\/f858d20d0246c767e85d8b3affd50a3f.png?v=1722615735"},{"product_id":"sennheiser-headphone-amp","title":"Sennheiser HDV-820 Headphone Amp","description":"\u003cp\u003eThe \u003cstrong\u003eSennheiser\u003c\/strong\u003e HDV-820 \u003cstrong\u003eheadphone amplifier\u003c\/strong\u003e integrates an extensive interface architecture spanning balanced XLR4, dual 4.4 mm Pentaconn, and optical, coaxial, and USB digital inputs for dedicated high-resolution headphone playback. Equipped with an ESS 9028PRO SABRE digital-to-analogue converter, it processes PCM streams up to 32-bit\/384 kHz and native DSD256 to deliver transparent sound reproduction across demanding dynamic loads. Engineered for critical listening environments, this reference component provides adjustable gain stages to seamlessly match both high-impedance and sensitive headphones.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eLiving with the Sennheiser HDV-820 on an audio desk transforms quiet personal listening into an immersive, private auditorium experience. Its substantial rotary dials and clean tactile switches offer reassuring precision whenever switching gain levels or toggling between digital feeds. The solid anodised aluminium chassis creates a quiet electrical environment, ensuring backgrounds remain jet-black even during delicate, low-level acoustic passages. It serves as a steadfast anchor for daily reference listening, providing fatigue-free clarity hour after hour.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference DAC Architecture:\u003c\/strong\u003e Converts PCM signals up to 32-bit\/384 kHz and DSD256 via an ESS 9028PRO SABRE chipset for pristine signal resolution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalanced Output Topology:\u003c\/strong\u003e Utilises 4.4 mm Pentaconn and 4-pin XLR connections to maintain channel separation and suppress common-mode interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnodised Aluminium Enclosure:\u003c\/strong\u003e Shields sensitive internal analogue circuitry from ambient electromagnetic and mechanical disturbances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorized Dealer Assurance:\u003c\/strong\u003e Hi-Fi Centre provides full manufacturer warranty coverage, certified technical support, and post-purchase guidance on every Sennheiser component.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10 Hz – 100,000 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion (THD):\u003c\/strong\u003e \u0026lt; 0.001%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e \u0026gt; 115 dB @ 600 Ω load (A-weighted)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrosstalk Attenuation:\u003c\/strong\u003e 93 dB @ 1 kHz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital Inputs:\u003c\/strong\u003e 1 x USB (Type-B), 1 x Optical (Toslink), 1 x Coaxial S\/PDIF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalogue Inputs:\u003c\/strong\u003e 1 x Balanced stereo pair (XLR-3), 1 x Unbalanced stereo pair (RCA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeadphone Outputs:\u003c\/strong\u003e 1 x Combo 6.35 mm \/ 3-pin XLR, 1 x Balanced 4-pin XLR, 2 x Balanced 4.4 mm Pentaconn\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalogue Preamp Output:\u003c\/strong\u003e 1 x Balanced stereo pair (XLR-3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain Adjustment:\u003c\/strong\u003e 5-position rear switch (14 dB, 22 dB, 30 dB, 38 dB, 46 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Consumption:\u003c\/strong\u003e 12 W to 18 W nominal (\u0026lt; 0.5 W standby)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (W x H x D):\u003c\/strong\u003e 224 x 44 x 306 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.25 kg\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan the Sennheiser HDV-820 drive multiple headphones simultaneously?\u003c\/strong\u003e\u003cbr\u003e\nYes, the front fascia provides multiple balanced and unbalanced connections—including dual 4.4 mm Pentaconn sockets and a 4-pin XLR output—allowing multiple pairs of headphones to be connected concurrently, provided their impedance ratings are broadly aligned.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCan the HDV-820 operate as a standalone preamplifier?\u003c\/strong\u003e\u003cbr\u003e\nYes, the unit features a dedicated balanced XLR-3 stereo preamplifier output on the rear panel, allowing it to feed active studio monitors or a separate power amplifier directly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhich digital audio formats and sampling rates are supported?\u003c\/strong\u003e\u003cbr\u003e\nThe integrated ESS 9028PRO SABRE DAC decodes PCM bitstreams up to 32-bit\/384 kHz via USB and supports native DSD decoding up to DSD256 (12.3 MHz), alongside standard S\/PDIF optical and coaxial inputs supporting up to 24-bit\/192 kHz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow do I adjust the output gain for different headphone impedances?\u003c\/strong\u003e\u003cbr\u003e\nA 5-position rotary switch on the rear panel allows you to tailor the analogue gain stage (14 dB, 22 dB, 30 dB, 38 dB, or 46 dB) to ensure optimal dynamic range and headroom for both high-sensitivity and high-impedance loads.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":43819697340469,"sku":"HDV-820","price":3199.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2246\/9355\/files\/HDV820.jpg?v=1722616730"},{"product_id":"sennheiser-ie900-reference-in-ear-headphones","title":"Sennheiser IE900 Reference In-Ear Headphones","description":"\u003cp\u003eThe \u003cstrong\u003eSennheiser\u003c\/strong\u003e IE900 Reference \u003cstrong\u003eIn-Ear Headphones\u003c\/strong\u003e are precision-engineered dynamic monitors developed for audiophiles seeking clinical accuracy and uncoloured fidelity on the move. Machined from single blocks of solid aluminium, each housing integrates proprietary 7 mm TrueResponse transducers paired with an internal three-chamber absorber network. This design eliminates resonant masking, providing transparent clarity across the full audible frequency spectrum.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eThe Sennheiser IE900 manages to deliver the scale and spatial accuracy of a high-end desktop setup in a compact, portable format. In everyday use, the milled aluminium chassis provides an immediate, secure acoustic seal that effectively isolates ambient noise during transit or quiet work sessions. High frequencies reproduce cleanly without harshness, making extended listening completely effortless. These monitors provide genuine reference-grade insight into your music collection wherever your day takes you.\u003c\/p\u003e\u003ch3\u003eKey Acoustic \u0026amp; Design Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eX3R Absorber System:\u003c\/strong\u003e Triple Helmholtz resonators capture and neutralise masking frequencies to uncover subtle micro-details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Aluminium Housings:\u003c\/strong\u003e Single-block CNC-milled enclosures eliminate internal reflections to guarantee clean, uncoloured sonic reproduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFidelity+ MMCX Connectivity:\u003c\/strong\u003e Supplied with para-aramid reinforced cables featuring 2.5 mm, 3.5 mm, and 4.4 mm terminations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorised Dealer Guarantee:\u003c\/strong\u003e Hi-Fi Centre is an authorised dealer, ensuring full manufacturer warranty protection and dedicated customer support.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBrand: Sennheiser\u003c\/li\u003e\n\u003cli\u003eModel: IE900 Reference In-Ear Headphones\u003c\/li\u003e\n\u003cli\u003eTransducer Principle: Dynamic, single 7 mm TrueResponse driver\u003c\/li\u003e\n\u003cli\u003eAcoustic Design: Closed, X3R triple-chamber Helmholtz resonator system\u003c\/li\u003e\n\u003cli\u003eFrequency Response: 5 Hz – 48,000 Hz\u003c\/li\u003e\n\u003cli\u003eImpedance: 16 ohms\u003c\/li\u003e\n\u003cli\u003eTotal Harmonic Distortion (THD): \u0026lt; 0.05% (1 kHz, 94 dB)\u003c\/li\u003e\n\u003cli\u003eSound Pressure Level (SPL): 123 dB (1 kHz, 1 Vrms)\u003c\/li\u003e\n\u003cli\u003eEar Coupling: In-ear monitor\u003c\/li\u003e\n\u003cli\u003eConnector Type: Fidelity+ MMCX\u003c\/li\u003e\n\u003cli\u003eCable Terminations: 2.5 mm balanced, 3.5 mm unbalanced, 4.4 mm balanced\u003c\/li\u003e\n\u003cli\u003eIncluded Accessories: Silicone and memory foam ear adapters (S\/M\/L), cable clip, cleaning tool, protective travel case\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDo I need a dedicated headphone amplifier to drive the Sennheiser IE 900?\u003c\/strong\u003e\u003cbr\u003eWith a nominal impedance of 16 ohms and a sensitivity rating of 123 dB SPL, the IE 900 is exceptionally efficient and can be driven directly from portable devices. However, given its reference-grade resolving power and micro-detail retrieval, pairing it with a high-calibre digital audio player (DAP) or dedicated balanced DAC\/headphone amplifier is strongly recommended to extract maximum acoustic performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the function of the X3R triple-chamber absorber system?\u003c\/strong\u003e\u003cbr\u003eIn standard dynamic earphone designs, resonance peaks inside the ear canal can mask subtle high-frequency harmonics. The X3R system incorporates three precision-machined Helmholtz resonator chambers and an acoustic vortex directly into the aluminium chassis to target and neutralise these masking resonances, delivering an uncoloured, linear treble response.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use third-party MMCX cables with the IE 900?\u003c\/strong\u003e\u003cbr\u003eThe IE 900 utilises Sennheiser's proprietary Fidelity+ MMCX connectors, which are recessed into the solid aluminium housing to provide superior mechanical stability and strain relief. While standard MMCX plugs share the same pin geometry, generic aftermarket cables lacking the matching recessed collar profile may not seat securely. Sennheiser includes three para-aramid reinforced cables (2.5 mm balanced, 3.5 mm unbalanced, and 4.4 mm balanced) out of the box to accommodate virtually any audiophile source.\u003c\/p\u003e","brand":"Sennheiser","offers":[{"title":"Default Title","offer_id":43819701239861,"sku":"IE900","price":1999.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2246\/9355\/files\/51O87LyNSSL._AC_UF894_1000_QL80.jpg?v=1722616794"},{"product_id":"sennheiser-hd-820-reference-closed-headphones","title":"Sennheiser HD-820 Reference Closed Headphones","description":"\u003cp\u003eThe \u003cstrong\u003eSennheiser\u003c\/strong\u003e HD-820 Reference Closed Headphones are circumaural \u003cstrong\u003eover-ear headphones\u003c\/strong\u003e built with concave Gorilla Glass reflectors and a damped metal headband, engineered for critical music listeners seeking acoustic isolation. By pairing 56mm dynamic Ring Radiator transducers with targeted internal absorber chambers, they systematically eliminate the standing waves and enclosed resonances common to sealed housings. This sealed architecture delivers the expansive spatial presentation of an open transducer while preventing acoustic leakage into quiet environments.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eClosed-back designs typically trade acoustic soundstage width for ambient noise attenuation, yet the Sennheiser HD-820 circumvents this limitation entirely. Living with these headphones allows for deeply immersive late-night listening sessions in active households without spilling sound into adjacent rooms. The physical microfibre seal provides immediate isolation from domestic distractions, while the concave glass reflections generate an articulate, three-dimensional acoustic space. For listeners requiring uncoloured reference sound in a closed acoustic platform, they represent an uncompromising daily companion.\u003c\/p\u003e\u003ch3\u003eKey Acoustic \u0026amp; Design Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConcave Glass Reflectors:\u003c\/strong\u003e Precision Gorilla Glass covers direct rearward sound waves into internal absorber chambers to eliminate boxy acoustic resonances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e56mm Ring Radiators:\u003c\/strong\u003e Large-format dynamic transducers maintain total diaphragm stability across the audible spectrum for rapid transient response and low harmonic distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrofibre Acoustic Seal:\u003c\/strong\u003e Handcrafted synthetic leather and microfibre earpads attenuate ambient external noise while preserving mechanical comfort during long sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorized Dealer Support:\u003c\/strong\u003e Hi-Fi Centre is an Authorized Dealer for Sennheiser, providing genuine manufacturer warranty coverage, certified inventory, and ongoing technical support.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e Sennheiser HD-820\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Principle:\u003c\/strong\u003e Dynamic, closed-back (sealed)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Size:\u003c\/strong\u003e 56 mm Ring Radiator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEar Coupling:\u003c\/strong\u003e Circumaural (over-ear)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 6 Hz – 48,000 Hz (-10 dB) \/ 12 Hz – 43,800 Hz (-3 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Impedance:\u003c\/strong\u003e 300 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound Pressure Level (SPL):\u003c\/strong\u003e 103 dB (1 kHz, 1 Vrms)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion (THD):\u003c\/strong\u003e \u0026lt; 0.02% (1 kHz, 1 Vrms)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Microfibre fabric, synthetic leather, Gorilla Glass, damped metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCables Included:\u003c\/strong\u003e 6.35 mm unbalanced stereo jack, 4.4 mm Pentaconn balanced plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 360 g (without cable)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo the Sennheiser HD-820 headphones require a dedicated amplifier?\u003c\/strong\u003e\u003cbr\u003eYes. With a nominal impedance of 300 ohms, the HD-820 requires a dedicated, high-current headphone amplifier or DAC\/amplifier combination to achieve proper dynamics, headroom, and frequency linearity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow do the concave Gorilla Glass reflectors improve sound quality?\u003c\/strong\u003e\u003cbr\u003eIn standard closed-back headphones, rearward sound waves bounce back into the ear cup, causing standing waves and muffled resonances. The HD-820 uses curved Gorilla Glass reflectors to redirect rearward waves into internal acoustic absorption chambers, delivering an open, transparent soundstage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAre balanced connection cables supplied with the headphones?\u003c\/strong\u003e\u003cbr\u003eYes. 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Utilising a 300-ohm impedance and an optimised internal airflow system, these headphones yield extended sub-bass performance alongside exceptionally natural vocal clarity. Listeners seeking authentic tonal neutrality will appreciate the fast transient recovery and transparent spatial presentation across demanding source recordings.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eThe revised acoustic geometry of the HD-660S2 addresses what discerning listeners have long requested: tactile sub-bass presence without compromising classic Sennheiser midrange purity. Wearing these across extended evening listening sessions feels effortless, thanks to breathable velour padding and a balanced frame that avoids pressure points. The ventilated earcups create an intimate yet airy physical atmosphere that closely mirrors the acoustics of a well-treated room. They are an articulate personal listening tool for enthusiasts who prioritise absolute timbral truth and long-term comfort.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSub-Bass Extension:\u003c\/strong\u003e Acoustic airflow tuning increases low-end sound pressure to render deep bass notes without obscuring midrange articulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen-Back Architecture:\u003c\/strong\u003e Breathable mesh grilles allow unobstructed airflow to create natural acoustic depth and precise stereo separation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium Voice Coil:\u003c\/strong\u003e Ultra-light internal windings provide rapid impulse response for detailed treble reproduction and micro-dynamic clarity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorised Dealer Assurance:\u003c\/strong\u003e Hi-Fi Centre is an Authorized Dealer, ensuring genuine manufacturer warranty protection and dedicated customer support.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e Sennheiser HD-660S2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Principle:\u003c\/strong\u003e Dynamic, open\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Size:\u003c\/strong\u003e 38 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 8 Hz – 41,500 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpedance:\u003c\/strong\u003e 300 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSound Pressure Level:\u003c\/strong\u003e 104 dB (1 kHz, 1 Vrms)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e \u0026lt; 0.04% (1 kHz, 100 dB SPL)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEar Coupling:\u003c\/strong\u003e Over-ear (circumaural)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 260 g (without cable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Cables:\u003c\/strong\u003e 1.8 m unbalanced (6.3 mm), 1.8 m balanced (4.4 mm Pentaconn), 6.3 mm to 3.5 mm adapter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDo the Sennheiser HD-660S2 headphones require a dedicated headphone amplifier?\u003c\/strong\u003e\u003cbr\u003eYes. 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Featuring an on\/over-ear closed-back architecture, this design pairs proprietary 42 mm dynamic transducers with adaptive noise suppression to maintain linear frequency response across demanding listening environments. Integrated USB-C digital audio processing delivers uncompressed resolution up to 24-bit\/96 kHz alongside high-bitrate Bluetooth 5.2 connectivity.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eIn daily listening, the Sennheiser HDB-630 isolates the listener into an undisturbed acoustic field, effectively neutralising ambient travel noise and commuter disruption without introducing phase artefacts. The reinforced aluminium headband and ergonomic ear cushions balance contact pressure effectively, preventing mechanical fatigue during prolonged sessions. Sonically, the acoustic presentation delivers linear low-frequency control, transparent midrange articulation, and faithful transient preservation true to master recordings. 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