JBL Control 1 Plus
The JBL Control 1 Plus is a compact two-way bookshelf monitor that appears to have been built for near-field listening. The historical record on it is thin. No production years or original price have surfaced in any source, and there's no documented context for where it sat in JBL's lineup. What is known comes from the service manual and from owner reports. They agree: a small, sealed-box speaker with honest limitations.
The manual specifies an acoustic suspension (sealed) design with a 5-1/4 inch woofer and a 1/2 inch tweeter crossing over at 2.5 kHz. Frequency response is rated at 80 Hz to 20 kHz (-3 dB), sensitivity at 87 dB SPL (1 W, 1 m), and nominal impedance at 8 ohms. Power handling is stated as 75 watts continuous program in the service manual. Some owners describe it as "75 watts max," but the manual's wording is the more authoritative rating. The cabinet measures 236 × 153 × 155 mm and weighs 2.1 kg, so it's small and easy to place.
Owner accounts line up with the specs. A listener on hifivision.com called the Control 1 Plus a good near-field monitor for small rooms, but said it doesn't go very deep in the bass. That's expected from a sealed enclosure of this size. Another owner on a DIY mobile audio forum said it "sounds really good for its size." Recording Engineer (April 1990, p.60) mentioned the Control 1 Plus in a product update roundup. The surviving OCR text from that page is too fragmentary to pull out any specific claims about performance or pricing.
Beyond that, the record is essentially empty. No common problems, spare parts availability, or current market values are documented.
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