{"product_id":"symphony-ii-5-312-c8-25-hex","title":"Symphony II 5-312\/C8\/25 HEX","description":"\u003cp\u003eThe \u003cstrong\u003eETON Symphony II 5-312\u003c\/strong\u003e is a top-class 5\" midwoofer driver for audiophile DIY loudspeaker projects and speaker manufacturers that demand Hexacone cone technology, a phase plug for controlled dispersion behavior, and genuine bass extension down to below 50 Hz. The heart of the Symphony II 5-312 is the combination of the \u003cstrong\u003epatented multilayer Hexacone cone\u003c\/strong\u003e and the \u003cstrong\u003ephase plug\u003c\/strong\u003e in an open design: The Hexacone cone provides exceptional cone stiffness with low moving mass (Mmd = 9.4 g) and an effective radiating area of Sd = 80 cm². The phase plug actively optimizes dispersion behavior in the upper frequency range: It ensures uniform sound radiation across the entire cone surface, improves air circulation in the pole piece area, and enables crossover frequencies up to approx. 2–3 kHz with controlled, low-beaming dispersion behavior.\u003c\/p\u003e\n\u003cp\u003eWith a resonance frequency of 54 Hz (TSP), a Qts of 0.44, and an equivalent volume of 8.4 dm³, the Symphony II 5-312 is designed for bass-reflex enclosures from approx. 10–20 liters tuned around 40–50 Hz – for bass extension down to below 40 Hz in a compact 5\" format. The mechanical Xmax of ±7.5 mm provides a generous safety margin at 50 W power handling (IEC 60268-5). With a total diameter of 148 mm and a weight of 1.28 kg, the Symphony II 5-312 is the phase plug variant in the 5\" format – for projects that demand Hexacone cone quality, genuine 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 5-312 for your project?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented multilayer Hexacone cone + phase plug\u003c\/strong\u003e: Aerospace technology meets controlled dispersion behavior – dimensionally stable at high excursions, linear at 50 W as at 1 W\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase plug: uniform dispersion behavior up to 2–3 kHz\u003c\/strong\u003e: reduced thermal compression and phase-optimized tweeter integration for a wide sweet spot\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBL = 5.7 Tm \/ fs 54 Hz (TSP) \/ Sd = 80 cm² \/ Xmax ±7.5 mm mechanical\u003c\/strong\u003e: powerful motor with generous cone area for bass extension down to below 40 Hz in a bass-reflex enclosure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQts 0.44 \/ Vas 8.4 dm³\u003c\/strong\u003e: designed for bass-reflex enclosures from approx. 10–20 liters – compact 2-way loudspeakers with genuine bass extension and phase plug\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e88 dB \/ 50 W (IEC 60268-5) \/ Le = 0.45 mH \/ Ferrite 1.15 T\u003c\/strong\u003e: high efficiency and thermal power handling for high-SPL reproduction in long-term operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e148 mm Ø, 68 mm depth, 1.28 kg\u003c\/strong\u003e: compact 5\" format for 2-way and 3-way systems with phase plug and genuine bass extension. Made in Germany.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor DIY loudspeaker projects and speaker manufacturers that demand Hexacone cone technology, a phase plug for controlled dispersion behavior, and genuine bass extension in a compact 5\" format – the ETON Symphony II 5-312. Made in Germany, from the ETON factory.\u003c\/p\u003e","brand":"ETON Soundsysteme GmbH","offers":[{"title":"Default Title","offer_id":56768836501887,"sku":null,"price":160.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/3516\/4799\/files\/symphony_5312_front.png?v=1773154139","url":"https:\/\/eton-hifi.com\/en\/products\/symphony-ii-5-312-c8-25-hex","provider":"ETON Soundsysteme GmbH","version":"1.0","type":"link"}