Infinity ES-100
A compact full-range electrostatic loudspeaker from the late 1970s
Overview
The Infinity ES-100 is a full-range electrostatic loudspeaker from the late 1970s, built by Infinity Systems as part of its experimental push into compact electrostatic designs. It pairs an electrostatic panel with dynamic drivers to get extended frequency response in a slim cabinet. An 8" woofer and a 10" passive radiator support the 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 uses an 8" woofer and a 10" passive radiator to augment bass response. It is only 2 inches deep, which is what you get with an electrostatic panel. A charged diaphragm hangs between perforated stators and handles the mid and high frequencies.
Context
Infinity developed the ES-100 in the late 1970s as a compact electrostatic experiment. The company was exploring ways to bring high-performance electrostatic sound to more accessible formats. The flagship IRS series was the pinnacle of its engineering. The ES-100 was a focused effort to fit electrostatic fidelity into a smaller, more practical enclosure.
Market
The most common problem with the ES-100 is degraded surrounds on the 8" woofer and the 10" passive radiator. They usually need new foam. Repair kits for both are currently available from third-party vendors.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.