About: Alpine BassRev BRV-S40 4" 2-Way Coaxial Speakers

Compact size, big-speaker feel - the Alpine BRV-S40 4" BassRev™ Coaxial Speakers are designed to deliver larger-than-life sound.

BIG-SPEAKER ENERGY

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.

MAX IMPACT WITH OPTIM™ 

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.

FULLER, MORE DYNAMIC MUSIC

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. 

RIGID, REFINED BUILD

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.

Features:

• 4" BassRev™ Coaxial Speaker Set (4" woofer w/coaxial 1" tweeter)
• Designed to pair with Alpine OPTIM8® using OPTIM™ Sync for maximum output
• Upgraded bass performance when tuned with OPTIM8® (Alpine Proprietary OPTIM™Sync Algorithm)
• Engineered for increased mid and low-end performance
• HEDGE™ Surround (High Excursion Design Gathered Edge) increases low-end output and extension
• Unique lapel cone shape enables higher excursion vs. traditional cones
• Polypropylene + mica cone for increased rigidity and cleaner response
• Ferrite magnet motor for stable performance and reliable power handling
• Gun-metal chemical coating for a premium, durable finish
• OEM-friendly fitment with shallow profile for tight doors and dash locations

Specifications: 

• 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)

*BassRev tuning requires Alpine OPTIM8® DSP/Amplifier using Alpine OPTIM™Sync Technology.