Alpine’s HEDGE surround on BassRev speakers acts like performance suspension for your woofer. On the BRV-S40, this unique surround lets the 4" cone move farther with control, so more power becomes real, cabin-filling impact—not wasted motion. That extra, linear movement translates to stronger low-end presence and fuller mids, giving BRV-S40 the impact you expect from a larger 6.5" driver while preserving smooth mids and clear vocals. The result is big-speaker feel from a compact 4" coaxial.

The BRV-S40 is impressive on its own, but the real magic happens when you pair it with Alpine’s OPTIM8 DSP/Amplifier using OPTIM™ Sync, our BassRev-specific tuning. OPTIM Sync intelligently applies dynamic bass boost and pre-EQ tailored to these drivers, safely extending low-end performance and smoothing tone to unlock their full potential. The result is bigger-than-size sound-a 4" set that plays with near-6.5" presence a speaker alone just can’t match.

The specialized lapel cone shape increases cone height and travel, giving the woofer more linear excursion than traditional designs. That extra, well-controlled movement delivers stronger low-end output while keeping the midrange clean and focused. Music feels fuller and more dynamic, and voices and instruments stay clear even at higher volumes.

Crafted to perform and last, the polypropylene/mica cone holds its shape for tight bass and natural mids. A durable gun-metal topcoat adds a premium finish and shrugs off daily wear. The edged dust cap reinforces the cone so playback stays stable and composed as the volume climbs. Together, these materials deliver clear, punchy sound with a refined finish you’ll appreciate on every drive.

• Woofer Size: 4"
• Tweeter Size: 1" (Coaxial)
• Power Handling: 40W RMS / 120W Peak
• Frequency Response (w/*BassRev Tuning ON): 67Hz - 20kHz
• Frequency Response (w/*BassRev Tuning OFF): 75Hz - 20kHz
• Sensitivity: 84dB (1W/1m)
• Impedance: 4Ω
• Mounting Depth: 1-3/4" (woofer)
• Cone Material: Polypropylene (woofer), Polyester cloth-dome (tweeter)
• Surround Material: Rubber HEDGE Design (woofer)
• Voice Coil Diameter: 25mm (woofer), 20mm (tweeter)
• Magnet Size: 75mm (woofer)
• Magnet Material: Ferrite (woofer), Neodymium (tweeter)
• Frame Material: Steel (woofer)