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Product Info
Product Info
The Alpine 4" S2-Series Coaxial Speaker 45W RMS S2-S40 is a Hi-Res Audio certified coaxial speaker engineered for compact installs in dashboards and doors. It pairs a 4-inch glass fibre composite woofer cone with a 1-inch soft dome tweeter to deliver clear, detailed sound with an extended frequency response of 120Hz to 40kHz, suiting small car audio systems and factory speaker upgrades.
The Alpine S2-S40 speaker handles up to 45W RMS and 140W peak power at 4 ohms impedance, with a sensitivity of 85dB/W SPL for efficient performance from factory head units and amplifiers. Alpine's patented High-Amplitude Multi-Roll (H.A.M.R.) surround increases cone excursion for punchy, controlled bass at high sound pressure levels, while the large strontium ferrite magnet structure adds driving power. A perforated net grille protects the swivel-mount tweeter, and the speaker suits a 93.6mm cutout diameter with a 43mm mounting depth for straightforward replacement of factory speakers.
Features
- High-Amplitude Multi-Roll (H.A.M.R.) surround increases cone excursion for punchy bass
- Hi-Res Audio certified for detailed, studio-quality sound reproduction
- Glass fibre composite woofer cone combines lightweight construction with rigidity
- Large magnet structure improves driving power and control
- 45W RMS / 140W peak power output
- Frequency response: 120 Hz–40 kHz
- Compact 4" size suits tight-space installs
- Sensitivity: 85 dB for efficient performance
- Balanced audio with extended treble response
- Durable build with Alpine's S-Series engineering
Tech Spec
| Speaker size (diameter) | 4 Inch (100mm) |
|---|---|
| Speaker type / configuration | 2-Way Coaxial |
| Peak power handling (W) | 140W |
| RMS power handling (W) | 45W (CTA-2031 compliant) |
| Impedance (ohms) | 4 Ohms (DCR 3.3 ohms) |
| Sensitivity (dB) | 85 dB/W SPL (1W @ 1m) |
| Frequency response (Hz) | 120 Hz to 40 kHz |
| Mounting depth (mm) | Woofer: 43mm, Tweeter: 17.6mm |
| Cutout diameter (mm) | 93.6mm (woofer); 51mm mounting diameter (tweeter) |
| Cone / tweeter material | Glass fibre composite woofer cone; 0.8" extended range soft dome tweeter |
| Grilles / hardware included | Perforated net grille (tweeter) |