Infinity RS 6000a (c. 1978–1981)
The RS 6000a is a floor-standing, 3-way bass-reflex loudspeaker from Infinity’s late-1970s RS series, produced roughly between 1978 and 1981. It’s a fairly straightforward design for the era: a 12-inch polypropylene woofer, a 4.5-inch polypropylene midrange, and a 1-inch tweeter, all mounted on a black cloth-covered baffle inside a walnut wood-grain vinyl cabinet. Crossover points are set at 450 Hz and 4 kHz, using a first-order (6 dB/octave) network. Rated sensitivity is 89 dB (1W/1m), impedance is 8 ohms, and Infinity spec’d it for up to 150 watts maximum, with 30–125W RMS recommended. Frequency response is listed as 45 Hz–35 kHz (±3 dB). Each speaker measures 600 × 370 × 320 mm and weighs 19 kg.
The surviving record disagrees about the tweeter. Most spec sheets describe a 1-inch soft dome, but some enthusiast sources insist the RS 6000a used Infinity's EMIT planar tweeter. The EMIT was a signature Infinity technology of the period, so the confusion is understandable. Still, the weight of documentation favors the soft dome. No source explains the "a" suffix versus the original RS 6000, and the two appear interchangeably in listings.
HiFI-Stereo (February 1989, p.127) ran a brief specification listing for the RS 6000a, noting its 89 dB sensitivity and 45 Hz–35 kHz (±3 dB) frequency response — figures that differ somewhat from the more commonly cited specs above, which suggests either a running production change or simply inconsistent catalog data across the model’s life. The review also listed a price of $798 per pair, though other sources estimate $500–600 per speaker when new.
Beyond that, the record is thin. No original MSRP is firmly confirmed, no replacement parts are documented, and there’s no solid information on how the “a” revision differed from the base model. What owners consistently say, though, is that it’s a smooth, easy-to-listen-to speaker with a natural midrange — a reasonable, honest 3-way tower from Infinity’s productive late-70s period.
- 3-way bass-reflex, floor-standing
- 12" polypropylene woofer, 4.5" polypropylene midrange, 1" soft dome tweeter
- Crossover: 450 Hz / 4 kHz, first-order
- Frequency response: 45 Hz–35 kHz (±3 dB)
- Sensitivity: 89 dB (1W/1m); Impedance: 8 ohms
- Power handling: 150W max; 30–125W RMS recommended
- Dimensions: 600 × 370 × 320 mm; 19 kg each
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