JBL LX80A
The LX80A is a crossover network - the passive dividing circuit that sits between an amplifier and the drivers in a multi-way loudspeaker system. External networks like this were often sold separately from the drivers and horns they went with. Builders and service technicians could assemble or repair systems from components. The LX80A crosses over at 800Hz and is rated for 8-ohm systems with a continuous program input of 100W.
What is documented about the LX80A comes largely from Japanese sources. The network was designed for a specific family of JBL drivers: the 136A, LE14A, 124A, or 130A on the low end, paired with an LE175, LE85, or 375 compression driver on the high end, used with HL92 or HL93 horns. It has a continuously variable level control for the high-frequency section, so the user can set the balance by ear or to suit the room. The crossover uses high-voltage non-polar capacitors and coils wound on low-loss oriented cores. A plastic tube packing around the frame keeps the network airtight when it is mounted in an enclosure.
The original price was approximately ¥56,000 per unit around 1980. It's compact, at 2.7kg packed, and appears to have been sold as a pair for stereo use.
Beyond that, the record is thin. No production years, dimensions, or frequency response figures are documented in the available sources. What survives are auction listings. A pair sold on Yahoo! Japan Auctions with a buy-it-now price of ¥25,000, and the seller confirmed the units were tested and working before listing. Another listing bundles the LX80A with JBL 2420 compression drivers, 2312 and 2308 horns, and a Fostex FW405.
Known specifications:
- Type: Passive crossover network
- Crossover frequency: 800Hz
- Input impedance: 8Ω
- System allowable input: 100W (continuous program)
- Level control: Continuously variable
- Weight (packed): 2.7kg
- Original price: ¥56,000 (circa 1980)
Similar items on eBay
No exact JBL LX80A listings are live right now — these searches show current JBL and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.