Symphony II 7-312/C8/32 HEX

The ETON Symphony II 7-312 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 patented multi-layer Hexacone diaphragm and the phase plug 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.

With 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.

Why the ETON Symphony II 7-312 for your project?

• Patented multi-layer Hexacone diaphragm + phase plug: aerospace technology meets controlled dispersion behavior – dimensionally stable even at ±8.8 mm Xmax, linear at 80 W as at 1 W
• Phase plug: uniform dispersion behavior up to 1–2 kHz: reduced thermal compression during long-term operation and phase-optimized midrange/tweeter integration for a wide sweet spot
• BL = 8.8 Tm / fs 35 Hz (TSP) / Sd = 137 cm² / Qts 0.29: powerful drive with generous diaphragm area for subwoofer-like bass extension – bass-reflex enclosures from approx. 30–60 liters
• Xmax ±4.5 mm electrical / ±8.8 mm mechanical / 80 W (IEC 60268-5): high linear excursion and thermal reserves for high-output, low-distortion bass reproduction
• 89 dB / 32-mm copper voice coil / ferrite 1.00 T / Le = 0.90 mH: high efficiency and a stable, predictable load for common hi-fi amplifiers
• 181 mm Ø, 87 mm depth, 2.03 kg: compact 7" format with phase plug for 2-way & 3-way. Made in Germany.

For 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.