Infinity SM-155 Value & Price History
As of 2026-10-06, a Infinity SM-155 has a market value at around $1,200 (per pair); restored examples average $1,199.99. Based on 121 estimated sales.
Price history
Asking median is down 23% over the last 43 days ($1,200 → $923).
View as table
| Date | Asking | Restored | Sold |
|---|---|---|---|
| 2026-08-25 | $1,200 | — | — |
| 2026-08-31 | $998 | — | $1,200 |
| 2026-09-06 | $998 | $1,199.99 | $1,200 |
| 2026-09-12 | $995 | $1,199.99 | $1,200 |
| 2026-09-18 | $995 | $1,199.99 | $1,200 |
| 2026-09-24 | $995 | $1,199.99 | $1,200 |
| 2026-09-30 | $995 | $1,199.99 | $1,200 |
| 2026-10-06 | $923 | $1,199.99 | $1,200 |
Daily trimmed medians from qualifying eBay listings; days without a fresh sync are not plotted.
Specifications
| Years produced | 1982–1987 |
| Type | Speaker |
| Brand | Infinity |
| Original MSRP | 800 (1982) |
| Inflation-adjusted | ~$2,800 today |
| Market value (sold) | $1,200 |
| Currently listed (asking) | $923 |
| Restored value | $1,199.99 |
| Value vs MSRP | +15% |
Parts & supplies
Common maintenance items for the Infinity SM-155. eBay links are model-specific searches; Amazon links are for generic supplies that work across most equipment.
- Infinity SM-155 surround refoam kit on eBay →
- Infinity SM-155 crossover rebuild caps on eBay →
- Infinity SM-155 replacement tweeter on eBay →
- Infinity SM-155 grilles and badges on eBay →
- Speaker wire — 16awg is standard for most setups on Amazon →
- Banana plugs — cleaner connection than bare wire on Amazon →
- Polyfill acoustic stuffing — reduces internal resonance in sealed and ported cabinets on Amazon →
Purchases through these links may earn StereoWorth a small commission at no extra cost to you. See our affiliate disclosure. Repair budgeting: what vintage stereo repair actually costs.
Comparable models
- Infinity Kappa 7 $103/pair
- Infinity Reference 30 $105/pair
- Infinity RS-IIb $80/pair
Current listings
See all on eBay →-
infinity sm 155 speakers$1,600
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Speakers Only Infinity SM 155 Floor Standing Speakers Pair (Read Description)$850
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Infinity SM-155 Vintage Floor Speakers Pair 15” Woofers Tested Working$795
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INFINITY SM-155 Speakers$995
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Infinity SM 155 Floor Standing Tower Speakers Pair 2.0 Wired Black$500
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infinity sm 155 speakers$1,200
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