BF 37 - 4 OHM

Overview

The Visaton BF 37 - 4 OHM is a full-range speaker transducer featuring a 10 cm (3.9 inch) diameter design with a nominal impedance of 4 Ohms. It utilizes a paper cone and rubber surround for acoustic performance. The unit has a rated power handling capacity of 20 Watts and delivers a sound pressure level of 86 dB. Key electrical parameters include a resonance frequency (Fs) of 55 Hz, an equivalent volume (Vas) of 37 liters, and a total Q factor (Qts) of 0.45. Mechanical dimensions are approximately 100 mm in outer diameter, 83 mm in mounting cutout diameter, and 37 mm in depth.

Feature Summary

• Paper cone construction with rubber surround for durability
• High efficiency magnetic circuit design
• Robust steel frame structure

Applications

• DIY loudspeaker enclosure projects
• Home audio reproduction systems
• General purpose public address speakers

Procurement Notes

Verify the specific suffix designation to confirm the 4 Ohm impedance variant, as this series is available in multiple resistance options. Ensure the ordering code matches the exact mechanical mounting requirements for your intended chassis. Cross-reference the manufacturer's latest documentation to confirm current production status and any updated technical specifications prior to finalizing procurement.

Selection Notes

Select this component when a balanced mid-bass response is required for general audio applications. The low resonance frequency supports effective bass reproduction in appropriately sized enclosures. Consider the 4 Ohm impedance for compatibility with standard amplifier outputs designed for lower impedance loads. Evaluate the Vas parameter to determine optimal box volume calculations for sealed or ported designs.

Part Context

This model belongs to the Visaton BF series of full-range drivers, which are widely utilized in hobbyist and professional audio construction. The BF 37 specifically targets applications requiring a single-driver solution or a dedicated mid-bass element within a multi-way system. Its design emphasizes linear excursion and reliable performance across a broad frequency range suitable for music and speech.

Replacement Considerations

Direct replacements must match the 100 mm outer diameter and 83 mm cutout diameter. Verify that the substitute driver maintains a similar Fs and Vas to preserve the original enclosure tuning. Check for compatible 4 Ohm impedance to ensure proper power transfer from the existing amplifier stage without mismatch issues.