Mark Levinson LNC-2
A two-way electronic crossover from the golden age of high-end audio — the black box that made the legendary HQD system possible.
Overview
The LNC-2 is the Mark Levinson piece that rarely gets its own spotlight. It's a line-level active crossover. It splits a signal into separate bands before the amplifiers and drivers see it. In the late 1970s it sat at the center of the HQD reference system. Sound Components of Coral Gables, Florida, advertised that system as Hartley 24-inch subwoofers, Quad ESL loudspeakers, modified Decca ribbon tweeters, a Levinson ML-1 preamp, Levinson ML-2 amplifiers - and two Levinson LNC-2 crossovers, set at 100 Hz and 7 kHz.
That's the context for this unit. The LNC-2 wasn't a mass-market accessory. It was a system-specific building block, sold through a small network of appointed dealers. Lyric Hi-Fi in Manhattan and White Plains listed it alongside the JC-2 preamp and LNP-2 professional preamp in Audio (September 1976, p.149). Jonas Miller Sound in Beverly Hills ran the same lineup in the same issue, and noted the ML-1 Class A power amplifier as "coming soon." The LNC-2 was there from the start.
Functionally, the LNC-2 does what any active crossover does. It divides the audio spectrum into bands and sends each to its own amplifier and driver, instead of asking one amp to drive a passive crossover network inside a speaker. The HQD configuration used two of them. One crossed at 100 Hz between the subwoofers and the Quads. The other crossed at 7 kHz between the Quads and the Decca ribbons. Owners report that the appeal is the same today as it was then. You avoid a passive network's insertion loss and phase behavior, and each amplifier only handles the band it's given. The Quad ESL is notoriously difficult to drive, so that separation is not a luxury.
The LNC-2 turns up in the classifieds fairly often for a piece this specialized. A 1979 listing in Audio (April 1979, p.123) offered a "mint" LNC-2 electronic crossover at $975. A 1980 listing in the same publication (September 1980, p.106) asked $900. By 1984, a seller in Audio (August 1984, p.115) was offering a pair of "LNC-2 Mono 2-way crossovers, 100 Hz and 7 kHz" at $1,200 each as part of a complete HQD system breakup. So the LNC-2 was configured for specific crossover frequencies, not built as a universal adjustable box. Buyers should confirm which crossover points a given unit is set for before assuming it will drop into their system.
That frequency-specific nature is the LNC-2's defining quirk, and it cuts both ways. If you're building or maintaining an HQD-style system with Hartley subs, Quads and Decca ribbons, a correct LNC-2 is close to irreplaceable, and the asking prices reflect it. If you're not, the unit is a curiosity: a well-made Mark Levinson line-stage component whose crossover points may not match anything you own. Collectors note that the LNC-2 is often found only as part of a larger HQD package, which is how Sound Components sold it. They described the system as reproducing "a musical event better than any system we know of."
Documentation is thin. The fact sheet carries no verified specifications - no dimensions, no published distortion or noise figures, no confirmed production years, no original list price. What the period record does establish is the dealer network, the HQD pairing, the crossover frequencies (100 Hz and 7 kHz in the HQD configuration), and the secondary-market prices from 1979 through 1984. Anyone chasing a specific spec has the classifieds and dealer advertisements to go on. Verify the frequency configuration of any individual unit before purchase.
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