Infinity SM-155 Value & Price History
As of 2026-09-21, a Infinity SM-155 has a market value at around $1,200 (per pair); restored examples average $1,199.99. Based on 86 estimated sales.
Market value (per pair)
$1,200
Typical range $500–$1,600 · based on 86 recent sales
Estimated sale prices · 86 events · updated today · how we compute this
`
Currently listed from$500
Restored / serviced$1,199.99
Original retail (1982)$800 · ~$2,800 today
Price history
View as table
| Date | Asking | Restored | Sold |
|---|---|---|---|
| 2026-08-25 | $1,200 | — | — |
| 2026-08-28 | $998 | — | — |
| 2026-08-31 | $998 | — | $1,200 |
| 2026-09-03 | $998 | $1,199.99 | $1,200 |
| 2026-09-06 | $998 | $1,199.99 | $1,200 |
| 2026-09-09 | $998 | $1,199.99 | $1,200 |
| 2026-09-12 | $995 | $1,199.99 | $1,200 |
| 2026-09-15 | $995 | $1,199.99 | $1,200 |
| 2026-09-18 | $995 | $1,199.99 | $1,200 |
| 2026-09-21 | $995 | $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) | $995 |
| Restored value | $1,199.99 |
| Value vs MSRP | +24% |
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 $100/pair
- Infinity Reference 30 $105/pair
- Infinity RS-IIb $80/pair
Current listings
See all on eBay →
Track this model
Get an email when the price drops below your target.
No spam. One email when the price hits your target. Unsubscribe anytime.