UREI 813-C
Surviving documentation on the UREI 813-C is thin. It was a studio monitor from UREI's C series, introduced around 1987. The record is mostly trade-press product notes and studio directory mentions. No factory spec sheet has surfaced in this archive, so what follows is what the period magazines reported.
The most complete contemporary description is a New Products note in Recording Engineer (April 1987, p.90). It announced the 811C, 813C, and 815C monitors as a series with higher input sensitivity than the previous Time-Align line. It quotes 99 dB SPL for the 811C, 101 dB for the 813C, and 103 dB for the 815C. All three shared a new 801C coaxial midrange loudspeaker combined with a titanium-diaphragm compression driver, arranged to act as a single-point sound source. The note adds that additional bass drivers are used, but the sentence is truncated in the surviving copy. The claimed frequency-response envelope extended beyond 17.5 kHz.
A Studio Sound (March 1987, p.116) piece adds a practical detail. The 813C's horn assembly protrudes, and the operating manual specifically warns against removing the blue open-cell foam around the lip of the horn. The foam is there to reduce a shift in response. The passage cuts off mid-explanation.
The only substantial studio sighting comes from a Sound and Communication (April 1991, p.33) feature on Charles Myers Recording Studio. The studio used a pair of Urei/JBL 813 C monitors for low-frequency projection in a room treated with gradual-density fiberglass and RPG diffusers.
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