SB Acoustics SB15SFCR39-4 Bass-mid woofer

The SB Acoustics SB15SFCR39-4 is a meticulously engineered 5x8-inch bass-mid woofer that delivers deep, controlled bass from a compact footprint. Designed for discerning audiophiles and DIY enthusiasts, this driver excels in applications where space is at a premium but performance cannot be compromised. Its oval shape allows for slimmer enclosures, making it ideal for high-end car audio installations, bookshelf speakers, or custom home theatre systems where a traditional round driver would be too large.

At the heart of this woofer lies a low total Q factor (Qts) of 0.33, which ensures tight, accurate response and excellent transient control. This makes it equally suited to sealed or vented enclosures, where it can produce articulate, punchy bass without overhang. The 38.5mm voice coil and 5.5mm linear excursion (Xmax) provide robust power handling and clean output, while the 89.5dB sensitivity (2.83V/1m) ensures efficient use of amplifier power. With a resonance frequency of just 31.5Hz, it reaches impressively low for its size. The combination of a low electrical Q (Qes 0.34) and high mechanical Q (Qms 7.9) contributes to its authoritative yet refined character. Whether used as a dedicated mid-bass driver or as part of a two-way system, the SB15SFCR39-4 offers exceptional build quality and sonic precision, bringing professional-grade performance to any high-fidelity project.