Technics SB 4500B (1976)
A bookshelf or floor-standing loudspeaker introduced by Technics in 1976, noted for its linear phase design and warm balanced sound.
Overview
The Technics SB 4500B is a 2-way, 2-speaker bass reflex loudspeaker system developed during the peak of analog hi-fi. It was positioned as a more affordable alternative to Technics' higher-end SB-7000, SB-6000, and SB-5000 models. Designed with a focus on phase coherence, the speaker uses a stepped mounting surface to align the acoustic centers of the drivers along a vertical line, improving horizontal directivity and minimizing floor reflection interference from the woofer, which is mounted higher than typical.
Specifications
| Impedance | 8 ohms |
| Sensitivity | 92 dB (1W/1m) |
| Power Handling | 50W (music), 25W RMS |
| External Dimensions | Width 350 x Height 631 x Depth 325 mm |
| Weight | 14.5 kg |
| Crossover Frequency | 2000 Hz |
Design
The SB 4500B features a linear phase bass reflex system with a unique stepped baffle that aligns the acoustic centers of the woofer and tweeter along a vertical axis. This design enhances horizontal directional characteristics and reduces phase distortion. It uses a BBD-based delay network to measure and correct phase response for system-wide linearity. The 25 cm cone woofer has a voice coil bobbin made of hard aluminum foil for heat resistance, while the 6 cm cone tweeter uses CCAW (copper-coated aluminum wire) for its lightweight and thermally stable coil.
Context
Introduced in 1976, the SB 4500B was part of Technics' mid-tier hi-fi speaker lineup, offering advanced phase-linear technology at a more accessible price point. It was developed as a downscaled version of the flagship SB-7000, SB-6000, and SB-5000 series, bringing high-fidelity engineering to a broader market during the golden era of analog audio.
Market
Original pricing was ¥26,800 per unit around 1977. Today, NOS (New Old Stock) or mint-in-box units are rare and may exceed $300. A known maintenance issue is the need for refoaming or reconing due to aging driver components.
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