{"product_id":"symphony-ii-7-312-c8-32-hex","title":"Symphony II 7-312\/C8\/32 HEX","description":"\u003cp\u003eThe \u003cstrong\u003eETON Symphony II 7-312\u003c\/strong\u003e is a top-class 7\" woofer for audiophile DIY loudspeaker projects and loudspeaker manufacturers that demand Hexacone diaphragm technology, a phase plug for controlled dispersion behavior, and subwoofer-like bass extension down to below 35 Hz. The heart of the Symphony II 7-312 is the combination of the \u003cstrong\u003epatented multi-layer Hexacone diaphragm\u003c\/strong\u003e and the \u003cstrong\u003ephase plug\u003c\/strong\u003e in an open design: The Hexacone diaphragm, with an effective radiating area of Sd = 137 cm² and a mechanical Xmax of ±8.8 mm, delivers high-output, deep-reaching bass reproduction. The strong force factor BL = 8.8 Tm with a moving mass of 17.3 g ensures precise, controlled drive even at frequencies below 40 Hz at 80 W power handling (IEC 60268-5). The phase plug also actively optimizes dispersion behavior in the upper frequency range: it ensures uniform sound radiation, improves airflow in the pole piece area, and reduces thermal compression during long-term operation – for phase-optimized integration with the midrange or tweeter at crossover frequencies up to approx. 1–2 kHz.\u003c\/p\u003e\n\u003cp\u003eWith a resonance frequency of 35 Hz (TSP), a Qts of 0.29, and an equivalent volume of 30.0 dm³, the Symphony II 7-312 is designed for bass-reflex enclosures of approx. 30–60 liters with low tuning around 25–35 Hz – for extension well below 35 Hz. With 89 dB efficiency, 181 mm overall diameter, and 2.03 kg, the Symphony II 7-312 is the phase plug variant in the 7\" format – for 2-way and 3-way systems that demand subwoofer-like bass extension and controlled dispersion behavior up to the crossover frequency. Made in Germany, from the ETON factory.\u003c\/p\u003e\n\u003ch2\u003eWhy the ETON Symphony II 7-312 for your project?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented multi-layer Hexacone diaphragm + phase plug\u003c\/strong\u003e: aerospace technology meets controlled dispersion behavior – dimensionally stable even at ±8.8 mm Xmax, linear at 80 W as at 1 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase plug: uniform dispersion behavior up to 1–2 kHz\u003c\/strong\u003e: reduced thermal compression during long-term operation and phase-optimized midrange\/tweeter integration for a wide sweet spot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBL = 8.8 Tm \/ fs 35 Hz (TSP) \/ Sd = 137 cm² \/ Qts 0.29\u003c\/strong\u003e: powerful drive with generous diaphragm area for subwoofer-like bass extension – bass-reflex enclosures from approx. 30–60 liters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eXmax ±4.5 mm electrical \/ ±8.8 mm mechanical \/ 80 W (IEC 60268-5)\u003c\/strong\u003e: high linear excursion and thermal reserves for high-output, low-distortion bass reproduction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e89 dB \/ 32-mm copper voice coil \/ ferrite 1.00 T \/ Le = 0.90 mH\u003c\/strong\u003e: high efficiency and a stable, predictable load for common hi-fi amplifiers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e181 mm Ø, 87 mm depth, 2.03 kg\u003c\/strong\u003e: compact 7\" format with phase plug for 2-way \u0026 3-way. Made in Germany.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor DIY loudspeaker projects and loudspeaker manufacturers that demand Hexacone diaphragm technology, a phase plug, and subwoofer-like bass extension in a compact 7\" format – the ETON Symphony II 7-312. Made in Germany, from the ETON factory.\u003c\/p\u003e","brand":"ETON Soundsysteme GmbH","offers":[{"title":"Default Title","offer_id":56769184465279,"sku":null,"price":185.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/3516\/4799\/files\/symphony_7312_front.png?v=1773152384","url":"https:\/\/eton-hifi.com\/en\/products\/symphony-ii-7-312-c8-32-hex","provider":"ETON Soundsysteme GmbH","version":"1.0","type":"link"}