Infinity ES-100
A compact full-range electrostatic loudspeaker from the late 1970s
Overview
The Infinity ES-100 is a full-range electrostatic loudspeaker developed during the late 1970s as part of Infinity's experimental push into compact electrostatic designs. Manufactured by Infinity Systems, the speaker combines electrostatic panel technology with dynamic drivers to achieve extended frequency response in a relatively slim profile. It features an 8" woofer and a 10" passive radiator to support the electrostatic panel's output in the lower frequencies.
Specifications
| Frequency Response | 60 Hz – 18 kHz (±3 dB) |
| Sensitivity | 82 dB (2.83V @ 1m) |
| Dimensions (H×W×D) | 36" × 18" × 2" (91 × 46 × 5 cm) |
Design
The ES-100 is a full-range electrostatic panel speaker incorporating an 8" woofer and a 10" passive radiator to augment bass response. Its slim 2-inch depth reflects the inherent profile of electrostatic panel design, relying on a charged diaphragm suspended between perforated stators for mid and high-frequency reproduction.
Context
The ES-100 was developed as a compact electrostatic experiment in the late 1970s, a period when Infinity was exploring ways to bring high-performance electrostatic sound to more accessible formats. While the flagship IRS series represented the pinnacle of the company's engineering, the ES-100 reflected a focused effort to condense electrostatic fidelity into a smaller, more practical enclosure.
Market
The most common issue with the ES-100 is degraded surrounds on the 8" woofer and 10" passive radiator, often requiring foam replacement. Repair kits for both components are currently available from third-party vendors, indicating ongoing support for restoration and maintenance of these vintage units.
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