Infinity RS 1.5 (1987–1990)
The Infinity RS 1.5 is a floor-standing loudspeaker built in the USA from 1987 to 1990. It was a 3-way, 5-driver design, and it originally sold for $750 each.
The driver complement per hifi-wiki.com consists of an IMG woofer, two IMG midranges, an IMG tweeter, and an IMG super tweeter. Crossover points are at 500 Hz and 4 kHz, and the cabinet measures 42 × 14 × 12.5 inches (H×W×D), weighing in at 58 lbs. The RS 1.5 is rated for 200 watts RMS of power handling, with a frequency response of 32 Hz to 38 kHz (±3 dB), and a nominal impedance of 6 ohms.
The sources disagree on sensitivity. AudioDatabase lists 87 dB and hifi-wiki.com lists 86 dB. There is no manufacturer documentation to settle it, so both figures get cited. The difference is negligible in practice.
Beyond the specs above, documentation on the RS 1.5 is thin. The sources we have record no historical context, market positioning or design lineage. They are entirely spec-oriented. The RS 1.5 is a solid, unremarkable late-80s Infinity floorstander. Period reviews noted its cassette deck line input rated at 200 millivolts High Fidelity (March 1981, p.18).
Known Specifications
- Type: 3-way, 5-driver floor-standing loudspeaker
- Drivers: IMG woofer, 2× IMG midrange, IMG tweeter, IMG super tweeter
- Frequency response: 32 Hz – 38 kHz (±3 dB)
- Crossover frequencies: 500 Hz, 4 kHz
- Impedance: 6 ohms
- Power handling: 200 watts RMS
- Sensitivity: 86–87 dB (source conflict)
- Dimensions: 42 × 14 × 12.5 in (H×W×D)
- Weight: 58 lbs
- Place of manufacture: USA
- Original price: $750 each
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