Celestion UL-6
Not much is documented about the Celestion UL-6, and what survives comes almost entirely from the company's own launch advertising. There are no independent technical reviews. The model appears to have been introduced around early 1976 as a compact bookshelf loudspeaker. Audio (January 1976, p.49) carried Celestion's announcement. It positioned the UL-6 as a small enclosure with a claimed 35 Hz - 28 kHz overall response, ±3.5 dB from 80 Hz - 20 kHz, and power handling rated at 20 watts continuous RMS.
The "UL" stood for "ultra linear." Celestion's marketing pushed the newly developed "acoustic motor units," including a soft dome tweeter, as what made the compact design possible. The advertised dimensions were 11½ × 16 × 8¼ inches. Past that, the record is thin. No independent measurements, no production run dates and no pricing have surfaced in the materials available to the Archive. If you own a pair and have documentation, service notes, or recollection of how they sounded, the record would benefit from your contribution.
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