EPI 100S (1970s)

Little is documented about the EPI 100S. It is unclear whether "100S" ever existed as a distinct model. The available record - enthusiast forums, classifieds, and period advertisements - consistently writes "EPI 100" or "EPI 100s" (lowercase s, almost certainly the plural of "100," referring to a pair). No source found uses the capital-S "100S" as a formal model designation. The archive pages that follow treat the 100S as synonymous with the well-known EPI 100. If you own a pair labeled otherwise, we'd welcome a correction.

Here is what is known of the EPI 100 itself. It is a two-way acoustic-suspension speaker with an 8-inch woofer and EPI's inverted-dome tweeter. It was roughly the size of the AR-4x. Production ran from the early to mid 1970s. Audio (May 1970, p.48) included the EPI-100 in its equipment profiles, and HiFi/Stereo (May 1970, p.45) called its tone-burst response "typical of a fine system." By 1976 the company was running ads claiming the EPI 100 had earned top ratings from a leading independent consumer-testing magazine. Enthusiasts today describe them as having "nice sound with a lot of details in high and mid range," though some find the bass lighter than competing designs from Advent.

Surviving pairs often need their crossovers recapped, and owners discuss it a lot. One undated forum post mentions buying a pair on eBay for about $60 delivered.

Known specs (as reported for the EPI 100):