Shure BLX288
The Shure BLX288 is a dual-channel handheld wireless system in Shure's BLX family, sold in several microphone configurations. The BLX288/SM58 - titled "Wireless Dual Vocal System with two SM58" on Shure's own product page - packages a BLX88 tabletop dual-channel receiver with two SM58 handheld transmitters, two microphone clips, a power supply, two AA batteries, and a user guide. The same receiver also comes as the BLX288/PG58 with two PG58 mics, and as the BLX288/B58 with two Beta 58A capsules.
The documentation is mostly system-level features, not deep specifications. Shure's product pages stress simple setup and up to 14 hours of battery life. Dealer listings add a 300 ft line-of-sight operating range, QuickScan frequency selection, and up to 12 channels per frequency band, depending on region and environment. Two frequency-band variants show up in the record: H9 at 512-542 MHz and H10 at 542-572 MHz.
The gaps are real. No production years, original price, or full technical specification (frequency response, RF output, S/N ratio, dimensions, weight) turned up in any available source. Everything above comes from Shure's own pages and dealer listings. The archive found no independent period reviews.
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