Marantz LS426 (1982)
The Marantz LS426 is a compact bookshelf speaker from 1982, originally priced at ¥40,000 for the pair in Japan. Documentation is thin. It doesn't appear in the usual English-language Marantz catalogs, and what survives comes mostly from Japanese database entries and the occasional secondhand listing. What the record shows is a 2-way, 2-speaker passive radiator design, which Marantz called the SBRS method. A 16 cm cone woofer handles the low end, paired with a 16 cm passive radiator - also 16 cm - and a dome tweeter covers the highs. The stated frequency response is 45 Hz to 20 kHz, with a maximum input of 60W and an output sound pressure level of 88 dB/W/m. Impedance is 8 Ω.
Physically, the LS426 is a tall-ish bookshelf speaker - 240 mm wide, 540 mm high, and 245 mm deep - weighing 7.2 kg. One used listing on a Malaysian forum (hifi4sale.net) described a pair in 7/10 condition. The seller noted the rubber surrounds were still pliable, with no cracks or hardening, and asked around RM250-300. That's about all there is. No crossover frequency, cabinet material, or review commentary has surfaced.
If you own a pair, you have one of the less-documented Marantz models.
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