Reference Standard 4B
| Brand | Infinity |
| Designer | Arnie Nudell |
| Function | Speaker |
| Produced | 1984-1986 |
| Country | United States |
| Model ID | RS-4b |
| Form Factor | Floorstanding |
| Signal Path | Passive Hardware |
| Dimensions | 34.3 × 83.8 × 25.4 cm (W × H × D) |
| Frequency Response | 40Hz-32kHz ±2dB |
| Tweeter | EMIT* (PN 902-5023) |
| Midrange | PolyDome (PN 902-3186C) |
| Bass | 8" Polypropylene Cone (x2) (PN 902-4976) |
| Impedance | 4Ω |
| Recommended Amplifier Power | 40-150W |
| Crossover Points | 600Hz, 4kHz |
| Finish | Oak |
| MSRP | $897 |
| Connections |
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| Controls |
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| Notes | *EMIT (ElectroMagnetic Induction Tweeter) |