Infinity RS Jr. (1977–1981)
The Infinity RS Jr. was the entry-level model in Infinity's RS series. The line was aimed squarely at the budget-to-mid-fi market, against the Advent, AR, and EPI speakers of the day. It was the smallest speaker in the RS line at the time, and it sold from 1977 through 1981. It's a 2-way bass reflex bookshelf design with a front-firing port, a 6.5" woofer, and a 3/4" Semi-Dome tweeter. A 3-position tweeter level switch on the crossover lets you tailor the top end to the room.
Sources disagree on two details. Most list the woofer as polypropylene and the tweeter as a 3/4" Semi-Dome polydome. VintageLoudspeakers calls the woofer an IMG (Injected Molded Graphite) unit and the tweeter a 1" soft dome. Sensitivity is usually given as 89 dB, with HiFi Classic claiming 90 dB. The 89 dB, polypropylene and 3/4" figures look better supported, but the IMG woofer is plausible for the period, since Infinity was using that material elsewhere in the RS line.
The cabinet is finished in walnut vinyl, measures 14.5" H × 9.5" W × 8" D, and weighs 15 lbs. Frequency response is rated at 60 Hz–20 kHz (±3 dB), impedance is 8 ohms, and the recommended amplifier range is 10–75 watts per channel. The crossover sits at 2.2 kHz. Audio (May 1982, p.17) noted the RS Jr. in its new-product pages, though the review record for this model is otherwise thin — no major hi-fi magazine measured it, and no original MSRP has survived in the documentation I’ve found.
The collector community is consistent on these. Owners describe them as warm, musical, and surprisingly good for their size, with a smooth, unhyped top end and punchy midbass. The foam surrounds on the woofers are the usual aging concern, though original examples with still-flexible surrounds do turn up. Asking prices in recent listings have run from $150 to $225.
Known Specs
- Type: 2-way bass reflex bookshelf, front-firing port
- Woofer: 6.5" (polypropylene per most sources)
- Tweeter: 3/4" Semi-Dome polydome
- Frequency response: 60 Hz–20 kHz (±3 dB)
- Crossover: 2.2 kHz, with 3-position tweeter level switch
- Sensitivity: 89 dB (90 dB per HiFi Classic)
- Impedance: 8 ohms
- Recommended amp: 10–75 W/ch
- Dimensions: 14.5" H × 9.5" W × 8" D
- Weight: 15 lbs
- Finish: walnut vinyl
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