ESS TRANSSTATIC-2: The Hybrid Electrostatic Visionary

In the late 1970s, as audiophiles and engineers alike sought to push the boundaries of high-fidelity sound reproduction, Electro-Static Sound (ESS) emerged as a bold innovator in loudspeaker design. Among their most intriguing creations was the ESS TRANSSTATIC-2, a hybrid loudspeaker that fused the precision of electrostatic technology with the practicality of dynamic drivers. Released in 1978, the TRANSSTATIC-2 represented a daring attempt to deliver the speed, transparency, and low distortion of electrostatic panels while overcoming their traditional limitations—limited bass response, low sensitivity, and narrow dispersion.

Though overshadowed by more commercially successful contemporaries like the Quad ESL-57 or the KLH 9, the ESS TRANSSTATIC-2 carved out a niche among discerning listeners who valued innovation and sonic purity. Today, it stands as a fascinating artifact of a transitional era in audio engineering—a time when the dream of perfect sound reproduction inspired radical experimentation.

Technical Specifications

The TRANSSTATIC-2 employed a push-pull electrostatic panel for the high frequencies—a design where two stator layers sandwich a thin, electrically charged diaphragm. This configuration reduced even-order harmonic distortion and improved linearity compared to single-ended electrostatics. Positioned above a sealed midrange chamber and a large bass-reflex enclosure, the panel delivered exceptional transient response and an airy, holographic treble.

Below the panel, a 5.25" midrange driver handled the critical vocal and instrumental frequencies, while two 8" woofers in a tuned ported cabinet provided deep, articulate bass extension. This hybrid approach allowed ESS to sidestep the weak bass and low efficiency that plagued pure electrostatics, making the TRANSSTATIC-2 more practical for real-world listening environments.

Sound Characteristics and Performance

The sonic signature of the ESS TRANSSTATIC-2 is best described as transparent, detailed, and dynamically expressive. The electrostatic panel imparts a remarkable clarity to the upper registers—cymbals shimmer with natural decay, strings exhibit lifelike bowing textures, and vocals emerge with an almost startling presence. Unlike many dynamic tweeters of the era, the electrostatic driver produces virtually no breakup or harshness, even at high volumes.

The midrange, handled by the dynamic cone, is smooth and well-integrated. While not as ethereal as the electrostatic top end, it avoids the colorations common in paper-cone drivers of the time, thanks to ESS’s use of a fiberglass composite material. The dual 8" woofers provide a solid foundation, delivering bass that is tight and well-controlled, though not as deep or room-shaking as larger dedicated subwoofers.

One of the TRANSSTATIC-2’s standout qualities is its soundstage reproduction. The open, panel-like dispersion of the electrostatic section creates a wide, three-dimensional image with precise instrument placement. Listeners often report a “you are there” quality, particularly with well-recorded acoustic and jazz material.

However, the speaker’s hybrid nature means it doesn’t fully replicate the “disappearing act” of full-range electrostatics. The transition between drivers, while generally seamless, can occasionally reveal itself in complex passages, especially if the crossover is not optimally aligned.

Notable Features and Innovations

The TRANSSTATIC-2 was a showcase of ESS’s engineering philosophy: combine the best of multiple technologies to achieve balanced, high-fidelity performance. Key innovations included:

• Push-Pull Electrostatic Panel: A rarity in consumer speakers at the time, this design reduced distortion and improved power handling.
• Modular Cabinet Design: The speaker’s cabinet was divided into acoustically isolated chambers to prevent inter-driver interference.
• External Power Supply Option: While the standard model used passive operation, ESS offered an optional external bias supply to enhance panel stability and longevity.
• User-Accessible Crossover: The crossover network was mounted on a removable panel, allowing for tuning and component upgrades—a feature appreciated by DIY enthusiasts.

ESS also emphasized build quality, using real wood veneers, precision machining, and hand-wiring techniques that reflected the high-end ethos of the late 1970s.

Common Issues and Maintenance

Like many vintage electrostatic hybrids, the ESS TRANSSTATIC-2 requires attentive care. The most common issues include:

• Diaphragm Degradation: The ultra-thin Mylar diaphragm in the electrostatic panel can deteriorate over time, especially in humid environments. Cracks or sagging lead to distortion or arcing.
• Stator Corrosion: Oxidation on the metal stator grids can affect performance. Cleaning with isopropyl alcohol and a soft brush is recommended.
• Crossover Component Aging: Electrolytic capacitors and resistors in the crossover may drift in value or fail after 40+ years. Replacing them with modern audiophile-grade parts can restore performance.
• Bias Supply Failure: If the speaker uses an external bias unit, the high-voltage circuitry may need servicing.

Owners are advised to keep the speakers in dry, climate-controlled environments and to power them on gradually using a variac to avoid sudden voltage spikes.

Current Market Value and Collectibility

The ESS TRANSSTATIC-2 is a rare and underappreciated gem in the vintage audio world. Few units were produced, and even fewer survive in working condition. As of 2024, working pairs in good cosmetic and sonic condition typically sell for $1,200 to $2,000, depending on provenance and restoration quality.

Collectibility is growing among enthusiasts of hybrid and electrostatic designs, particularly those interested in the evolution of planar technology. While not as iconic as the Quad ESLs or the later MartinLogan electrostats, the TRANSSTATIC-2 holds a special place as an ambitious, transitional design that bridged two worlds.

Restored units with upgraded crossovers and refreshed panels are increasingly sought after. Some owners pair them with modern tube amplifiers or Class A solid-state gear to highlight their strengths.

Conclusion and Legacy

The ESS TRANSSTATIC-2 was never a mainstream success, but it was never meant to be. It was a statement of intent—a bold fusion of electrostatic purity and dynamic practicality. In an era when many manufacturers were refining conventional cone drivers, ESS dared to experiment, to hybridize, and to challenge the status quo.

While it had its flaws—modest sensitivity, maintenance demands, and a complex design—its strengths in clarity, speed, and imaging remain impressive even by today’s standards. For the vintage audio enthusiast, the TRANSSTATIC-2 offers not just sound, but a window into a moment of fearless innovation.

If you’re lucky enough to encounter a pair in good condition, consider giving them a second life. With proper care, the ESS TRANSSTATIC-2 can still deliver a listening experience that is as emotionally engaging as it is technically fascinating—a true testament to the enduring allure of vintage high-fidelity.

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