B-312G Concerto II
| Brand | Bozak |
| Manufacturer | R.T. Bozak Co. |
| Designer | Rudy Bozak |
| Function | Speaker |
| Produced | 1968-1970 |
| Country | United States |
| Model ID | Concerto No. 2 |
| Form Factor | Floorstanding / Stand Mounted |
| Signal Path | Passive Hardware |
| Dimensions | 62.2 × 43.8 × 31.8 cm (W × H × D) |
| Weight | 60lbs |
| Frequency Response | 40Hz-20kHz |
| Treble | 2" Aluminum Cone (x2) (Bozak B-200Y) |
| Midrange/Bass | 12" Wool-Paper Multi-Fiber Cone (Bozak B-199A (B-207B Coaxial)) |
| Impedance (Nominal) | 8Ω |
| Crossover Frequency | 2.5kHz |
| Power Handling (Program) | 50W |
| Finish | Walnut |
| MSRP (1969) | $167.50 |
| Notes | Compact version of B-300 |