JBL SV50S (c. 2004)

The JBL SV50S is a small bookshelf speaker from JBL's home-theater-oriented SV series, introduced around 2004 at ¥46,000 for a pair. The "S" in the model number is thought to stand for "satellite." The SV50S was meant to be a satellite speaker in a surround setup. It sat alongside the SV800 and SV500 floorstanders and the SV400C center channel in the lineup.

It's a 2-way, 2-speaker bass-reflex design. The woofer is 13.3 cm with a pure-pulp white cone, an accordion pleat edge and an aluminum die-cast frame. The tweeter is horn-loaded, with a 1.9 cm semi-hard dome and titanium laminate on the diaphragm for added rigidity. The crossover is set at 7 kHz. The tweeter runs through an 18 dB/octave filter wired in reverse phase, and the woofer runs without a network. Rated impedance is 6 ohms, sensitivity is 91 dB/2.83V/m, and it handles 75W (music). Frequency response is rated at 70 Hz to 20 kHz.

The cabinet is compact at 170 × 290 × 155 mm and just 3.5 kg. It has a wood-grain finish, magnetic shielding (a cancel magnet and shield cover), and wall-mounting hardware built in. Optional brackets were available for wall or ceiling mounting. One owner's teardown notes that the depth is shallow enough for desktop placement, and that the woofer is the same unit used in the larger SV500. The same teardown found an unusual damping layout: synthetic wool on the bottom plus a strip running around the bass-reflex duct. JBL's A640 and A120 use the same configuration. The speaker terminals are simply press-fit into the rear panel and held in place by friction alone. A small network board is soldered directly to the back of the terminal cup.

That same owner's account is the closest thing to a review the SV50S has on record. They describe the sound as "slightly hump-flat," not particularly JBL-like, with the lower bass rolled off (consistent with the spec sheet), a somewhat forward midrange, and a treble that's a touch restrained. They also noted the listening position is critical. It's a 1.2 m equilateral triangle with the speakers, and it falls apart if the geometry shifts. The 7-10 kHz dip appeared consistently in their measurements regardless of mic position. They found the original BENNIC electrolytic capacitors to be a poor match for the tweeter. Replacing them with film and better electrolytic parts markedly improved transparency and separation.

Beyond its listing in Japanese audio databases and that single owner's blog, almost nothing else is documented about the SV50S. No production end date, no aggregate reviews, no current market pricing, and no systematic failure reports have surfaced.

• Type: 2-way, 2-speaker, bass-reflex, bookshelf, magnetically shielded
• Woofer: 13.3 cm cone (pure pulp white, accordion pleat edge)
• Tweeter: 1.9 cm semi-hard dome, horn-loaded, titanium laminate
• Frequency response: 70 Hz – 20 kHz
• Sensitivity: 91 dB / 2.83V/m
• Impedance: 6 Ω
• Power handling: 75W (music)
• Crossover: 7 kHz
• Dimensions: 170 × 290 × 155 mm (incl. grille)
• Weight: 3.5 kg
• Price: ¥46,000 / pair (c. 2004)

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