UREI 815S
A time-aligned monitor that studios bolted to the bridge and engineers trusted to tell the truth.
Overview
Working rooms treated the 815S as furniture more than a purchase. The Fallout Shelter in London ran a pair before Doug Hopkins took over the room in 1980 and swapped them out for 813s. A French studio built around salvaged Eastlake acoustics mounted its 815s isolated away from the monitor bridge, specifically to keep the cabinets from coloring the room. People didn't just own these, they designed rooms around them.
Per the period advertising, the 815S is a member of UREI's Time-aligned monitor family, which by 1980 had grown to three models. The family shared one architecture: UREI's 800 series Time-aligned crossover networks, Altec custom 604 duplex drivers fitted with a UREI high-frequency horn for extended and more uniform HF response, and pressure-controlled apertures that gave the cabinets good damping, high efficiency, and low distortion. UREI's own copy in Modern Recording (July 1980, p.83) claimed the line delivered "unbelievably clean reproduction from low levels to the threshold of pain." That's marketing language, but the recipe underneath is real: duplex driver, time-aligned crossover, controlled aperture loading. The 813 was billed in the same campaign as "an industry standard for typical control room applications," which makes the 815S the sibling rather than the flagship.
Sizing is where the record gets thin. The advertising copy is explicit that the family came in three sizes and that the 813 was the control-room standard, but the sources don't state the 815S's own dimensions, driver complement, or power handling. Studios reached for the 815S when they wanted the Time-aligned sound in a package distinct from the 813. The Fallout Shelter's swap from 815 to 813, and the Grasse room's decision to isolate its 815s from the bridge, both point to a monitor that rewarded careful placement. These are not set-and-forget boxes.
A caution on the model string: UREI used suffix letters across the 815 line, and the 815S should not be conflated with the 815B or the base 815. The 815S is the one that appears in the studio documentation above and in the used-gear listings of the era. A pair turned up in a March 1992 Mix classified at $2,500. That's roughly a decade after the model's peak, but it's a single asking price from a dealer ad, not a trend.
Temper your expectations. The 815S is a monitor, not a compressor or an EQ, and its following is functional rather than fetishistic. The people who want one are building or restoring a room. The Time-aligned crossover networks and Altec duplex drivers are serviceable, but the model's long association with installed studio use means many surviving examples have lived hard lives bolted into soffits and bridges. Buy on condition and on whether the drivers are original, and expect to do crossover work. There's no meaningful collector premium here.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.