Bozak B-313 Concerto III
A compact bookshelf speaker system delivering full three-way sound with Bozak’s signature coaxial and damped metal driver designs
Overview
The Bozak B-313 Concerto III is a compact three-way speaker system developed as an evolution of the B-312, adding a dedicated mid-range driver for improved clarity. Manufactured by Bozak, it integrates a coaxial low/high unit and a separate mid-range in a bookshelf-sized enclosure. Despite its compact form, it houses a full three-way configuration, making it a space-conscious yet high-fidelity option in Bozak’s speaker lineup. It was listed alongside other compact models like the B-301 and B-312G.
Specifications
| System type | 3-way, 2-speaker, bookshelf type |
| Enclosure | Compact Enclosure |
| Units Used: For Low/High Band | 30 cm Coaxial Type (B-207A) |
| Units Used: For Low Band | 30 cm Cone Type (B-199A) |
| Units Used: For High Range | 5 cm Cone Type x2 (B-200Y) |
| Units Used: For Middle Range | 16 cm Cone Type (B-209B) |
| Units Used: Other | N-10102 (crossover network) |
| Frequency characteristic | 45 Hz to 16 kHz |
| Impedance | 8 Ω |
| Rated input | 20W |
| Crossover frequency | 800 Hz, 2.5 kHz, 6dB/oct. |
| External dimensions | Width 610 x Height 430 x Depth 315 mm |
| Weight | 31.8 kg |
| Price | ¥107,700 (1 unit, circa 1966) |
Design
The B-313 uses a 30 cm coaxial unit (B-207A) for low and high frequencies, combining the B-199A woofer and B-200Y tweeter in one assembly. The B-199A features a felted paper cone with wool mixed into the pulp for lightweight stiffness and low distortion. The B-200Y tweeter uses a specially damped metal diaphragm to smooth frequency response. A dedicated 16 cm mid-range driver (B-209B), also with a damped metal diaphragm, enhances vocal and instrumental clarity. The crossover network N-10102 supports the mid-range driver. The terminal section includes a multi-amplifier selector switch and multi-amplifier terminal. The enclosure matches the B-312 and features a walnut oil finish.
Context
The B-313 was developed as an upgrade to the B-312, adding a mid-range driver to achieve full three-way performance. It belongs to a family of compact Bozak models including the B-301 and B-312G.
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