Shure HTS-50CF
A 37-pound center-channel anchor built to survive space-opera explosions without flinching.
Overview
The HTS-50CF is not a speaker you buy on its own. It's the center-front member of Shure's HTS Theater Reference System, a fully integrated surround package from the late 1980s. The package paired a dedicated logic decoder, purpose-built signal-processing amplifiers, and a matched family of loudspeakers. The 50CF sits at the middle of the front soundstage. Shure's own documentation says it's the hardest-working box in the set, because it has to handle dialog, music, and "much of the violent, highly dynamic special effects sounds" all at once. That's the company's framing, but it explains the design choices.
The cabinet measures 20 inches high, 13½ inches wide, and 8⅝ inches deep, and it weighs 37 pounds - heavy for a speaker this compact. The enclosure is 1-inch-thick high-density particleboard, surface-braced, cross-braced, and damped with fiberglass. Per Shure, that makes a very rigid, low-resonance box. The baffle carries two 6½-inch woofers with cast-aluminum baskets, curved polymer diaphragms, butyl rubber surrounds, and 4½-pound double magnet systems. The magnets are shielded, which matters because unshielded magnets near a CRT television will bend the picture. A 1-inch soft-fabric damped-dome tweeter sits between the two woofers in an in-line configuration, and the drivers are offset on the baffle. The grille carries acoustic foam padding to tame tweeter diffraction off the cabinet edge. The tweeter gets its own 20-ounce double-magnet assembly, plus diaphragm back damping, dome diffraction rings, annular foam damping, and Ferrofluid cooling in the gap. The walnut-veneer cabinet ends in gold-plated five-way binding posts.
The crossover is a two-way, fourth-order design (some Shure documentation describes the matched network as third-order/fourth-order) with impedance equalization and midband correction. Nominal response is specified at 55 Hz to 18 kHz, but there's a catch. In a system with the HTS 50SW subwoofer, the matching HTS 50SPA amplifier rolls the 50CF off at 80 Hz, so the speaker never sees the bottom octave. The "CFx" mode on the amp extends it back down to 55 Hz for systems without a subwoofer. All HTS 50-series speakers are rated for 200 watts peak program material and 100 watts nominal amplifier power. The excursion-limiting circuitry in the 50SPA exists to keep the 6½-inch woofers from destroying themselves during effects peaks.
High Fidelity (July 1989, p.41) tested the Reference System and found the response shaping across the speaker types notable, with the center speaker's low-frequency drop deliberate and amp-imposed; the same report described the subwoofer adding "a stunning woomph to space-opera explosions." HiFi-Stereo (April 1989, p.67) confirmed the 50CF's dimensions and its 37-pound weight, and listed the two 6½-inch woofers and 1-inch soft-dome tweeter.
The 50CF was sold as part of a $5,990 system in one Audio accounting (1990, p.53) and a $9,600 system in another (p.155). The discrepancy reflects different configurations and vintages of the package, and the speaker itself was never a standalone retail item in most markets. Buying one today usually means buying into the ecosystem, or accepting that the 80 Hz roll-off only makes sense with the right amplifier. The double-magnet, shielded drivers are the practical draw. This is a center channel you can park directly under a CRT without color purity problems, and the cabinet is heavy enough that it doesn't rattle when the dialog gets loud. Whether the foam grille padding has survived four decades is another matter. Acoustic foam of that era is a known deterioration point, and replacements aren't catalog items.
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