{"product_id":"es-lab-eht-7-electrostatic-headphones-energizer","title":"ES Lab EHT-7 Electrostatic Headphones Energizer","description":"\u003cp\u003e \u003c\/p\u003e\n \u003ch1\u003e\u003cstrong\u003eEngineered for Safe, Transparent Electrostatic Playback\u003c\/strong\u003e\u003c\/h1\u003e\n \u003cp\u003eThe EHT-7 unleashes the full potential of your electrostatic headphones while integrating with your existing speaker amplifier or headphone amplifier. Its exceptional driving capabilities deliver a natural and realistic soundstage, and preserve the ultimate transparency and detail retrieval that electrostatic headphones are famed for.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eInnovative transformer-based energizer design\u003c\/strong\u003e\u003cbr data-end=\"1899\" data-start=\"1896\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eUnlike conventional transformer setups, the EHT-7 incorporates innovative design considerations and technologies, which ensures a reliable and safe handling of the high voltage needed to power electrostatic headphones. This amplifier is crafted for music enthusiasts seeking the ultimate performance from electrostatic headphones.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eJapanese-crafted transformers with exceptional high-frequency response\u003c\/strong\u003e\u003cbr data-start=\"1973\" data-end=\"1976\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe step-up transformers have a fundamental role in shaping the sound of the EHT-7. The audio-grade transformers used in the EHT-7 are crafted in Japan, with each piece assembled by technicians to ensure the highest quality. The cores are made from grain-oriented silicon-iron steel from Nippon Steel Corporation. The effort put into the manufacturing process resulted in the excellent sonic performance of the transformers,\u003cbr\u003ewith an exceptional high-frequency response.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eOptional Lundahl LL1630 transformer upgrade\u003c\/strong\u003e\u003cbr data-start=\"2023\" data-end=\"2026\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe EHT-7 also offers the option of using Lundahl LL1630 transformers from Sweden, famed for their superior sound quality and measurement results by the community. It features a special audio C-core of Lundahl's production. Furthermore, the transformer is highly sectioned, and wound with a special low capacitance winding technique, resulting in an excellent high-frequency performance.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eMulti-stage clean bias power architecture\u003c\/strong\u003e\u003cbr data-start=\"2071\" data-end=\"2074\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe EHT-7 utilizes multiple stages of power processing to deliver a clean bias supply for the electrostatic headphone for optimal performance. This approach stands in contrast to the outdated voltage multiplier design, which is known for its noise generation but commonly used in conventional electrostatic energizers.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eLow-noise regulation and high-voltage conversion\u003c\/strong\u003e\u003cbr data-start=\"2126\" data-end=\"2129\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe EHT-7 draws power from an external switching power supply, feeding it into an ultra-low-noise LT3045 regulator circuit. The regulated voltage is then sent to a low-ripple, high-voltage DC-DC converter module, which generates the 580V bias required for the Pro Bias electrostatic headphone.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eImpedance options and dual input connectivity\u003c\/strong\u003e\u003cbr data-start=\"2178\" data-end=\"2181\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe EHT-7 offers adjustable impedance (8 Q or 16 0) for the primary windings of the transformers, ensuring optimal compatibility with your source amplifier. It also features two input options: speaker termination for connection to your speaker amplifier and XLR balanced input for connection to your headphone amplifier.\u003c\/p\u003e\n \u003ch2\u003e\n \u003cstrong\u003eRelay-based signal switching\u003c\/strong\u003e\u003cbr data-start=\"2213\" data-end=\"2216\"\u003e\n \u003c\/h2\u003e\n \u003cp\u003eThe signal switching in the input section is controlled by a set of 5 sealed silver-alloy contact relays, designed for a long lifespan and high current capacity.\u003c\/p\u003e\n \u003ch2 data-start=\"1783\" data-end=\"2265\"\u003e\u003cstrong\u003eComprehensive protection and safety systems\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp\u003eSafety is never compromised in our products, and the EHT-7 is no exception. Multiple measures are in place to protect the headphone, source amplifier, and the EHT-7 itself.\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\n \u003cp\u003eA clipping circuit formed by a network of zener diodes prevents signals exceeding 1150V peak (stator-to-stator) from reaching the headphone.\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eA pair of matched load resistors from Jantzen Audio are serially connected to the transformers, safeguarding against excessive DC current or impedance fluctuations that could damage the transformers.\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eA Vishay 4.7M high-voltage ballast resistor limits current before the bias reaches the headphone.\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eBuilt-in short-circuit protection is integrated into both the low-voltage regulator and the high-voltage DC-DC converter.\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eThe input circuitry is disabled when the EHT-7 is powered off\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3 data-end=\"1008\" data-start=\"987\"\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eInterfaces with existing speaker or headphone amplifiers\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eNatural, transparent soundstage with exceptional detail retrieval\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eJapanese-crafted audio-grade transformers with silicon-iron steel cores\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eOptional Lundahl LL1630 C-core transformers from Sweden\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eMulti-stage power conditioning for clean, low-noise 580V bias\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eLT3045 ultra-low-noise regulation + high-voltage DC-DC conversion\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eAdjustable input impedance (8Ω \/ 16Ω) for optimal amplifier matching\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eSpeaker-level and XLR balanced inputs\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eSealed silver-alloy contact relays for high-integrity signal switching\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003eExtensive protection: clipping control, load resistors, ballast resistor, short-circuit protection, bias safeguards\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli data-end=\"1742\" data-start=\"1010\"\u003e\n \u003cp\u003e2-year warranty\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003e\n \u003cp\u003eOutput Connection Type: Stax 5-pin Pro Bias\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eOutput Voltage Protection Threshold: 1150V peak (stator-to-stator)\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003ePower Input: 15VDC \/ 0.2A\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003ePower Constion:\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eDimensions: 215mm (Length) X 235mm (Width) X 80 (Height)\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eWeight: 3.1 KG\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eWarranty period: 2 years\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eJP Transformer\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\n \u003cp\u003eGain (8 Q): 31.1 dB\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eGain (16 Q): 27.8 dB Frequency Response: 10 Hz - 55 kHz\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003e(80\/-3dB, 50V rms,120pf load, Source: Topping LA90D)\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eRecommended Input Power Requirements:\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\n \u003cp\u003eSpeaker Amplifier: 5W - 100W\/80\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eHeadphone Amplifier: 10V\/160 or more\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eLundahl LL1630\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\n \u003cp\u003eGain: 23.0 dB\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eFrequency Response: 10 Hz - 65 kHz\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003e(-3dB, 50V rms, 120pf load, Source: Topping LA9OD)\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli\u003e\n \u003cp\u003eRecommended Input Power Requirements:\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003e\n \u003cp\u003eSpeaker Amplifier: 10W - 100W\/80\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e","brand":"ES Lab","offers":[{"title":"Japanese","offer_id":46866209570991,"sku":"APS-1153-1","price":850.0,"currency_code":"USD","in_stock":true},{"title":"Lundahl LL1630","offer_id":46866209603759,"sku":"APS-1153-2","price":1200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/apos-audio-es-lab-headphone-amp-es-lab-eht-7-electrostatic-headphones-energizer-1204451861.jpg?v=1777716237","url":"https:\/\/freshized.com\/products\/es-lab-eht-7-electrostatic-headphones-energizer","provider":"Freshized","version":"1.0","type":"link"}