JBL LX50A (circa 1980)
The JBL LX50A is a 2-way network (crossover) unit for a JBL speaker system. It sold in Japan for ¥63,000 per unit around 1980. It was designed to work with a 136A woofer on the low band and a 375 compression driver on the high pass, with HL88, HL89, or HL90 horn/lens options. The crossover point is 500Hz, input impedance is 8Ω, and the system is rated for 100W continuous program input.
Documentation is scarce, but what exists points at parts quality. The network uses high-voltage non-polar capacitors and coils wound on low-loss oriented cores. The frame is sealed with a plastic tube packing to keep the enclosure airtight. The level control is continuously variable. Packed weight is 2.7kg.
Beyond that, the record is thin. No production years, dimensions, or frequency response figures are documented. It appears to have been sold as a standalone network component - one eBay listing calls it a "Network Single" that came out of a JBL custom cabinet - rather than as part of a complete retail speaker system. No period reviews of the LX50A have surfaced in the sources available to the Archive, so no independent listening impressions are on record.
eBay Listings
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