Celestion UL-10
Not much is documented about the Celestion UL-10 beyond one thorough review in Audio (January 1977, p.46), which printed the manufacturer's full specification. It was a three-way, acoustic-suspension loudspeaker with a 10-inch woofer, a 2-inch dome midrange and a ¾-inch dome tweeter. Crossover points were 700 Hz and 5 kHz. The maker rated it at 50 watts continuous RMS sine wave, 8 ohms nominal (4 ohms minimum), and 40 Hz - 20 kHz ±2 dB. The cabinet measured 12½ × 15 × 26½ inches and weighed 50 lb. Price in early 1977 was $349.50.
The same review was candid about its limits. In Audio's crescendo-handling test (January 1977, p.54), the UL-10 struggled with dense, incoherently related tones, such as orchestral peaks. An inner musical voice at middle C dropped half a decibel when a 2-watt random-noise signal was superimposed. At 440 Hz the effect was stronger, reaching 2 dB of masking.
Surviving information on the UL-10 is otherwise thin. Celestion's advertising for the smaller UL-6, running in the same magazine that year, explained the "UL" badge as "ultra linear." The UL-10's dome-midrange and dome-tweeter layout suggests the same design family. Outside that January 1977 review, almost nothing else about this model appears in the record.
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