Description
DS18 S40
The DS18 S40 is a compact 4‑inch 2‑way coaxial car audio speaker pair engineered to deliver balanced sound and easy installation in tight spaces such as dash panels, doors, or rear decks. Featuring a coaxial design with an integrated 1″ mylar tweeter and durable PPI woofer cone, it produces clear midrange and smooth high frequencies across a wide response from approximately 80 Hz to 20 kHz. With 40 W RMS and 120 W peak power handling and a 4 Ω impedance, the S40 speakers are ideal for upgrading factory audio systems or expanding multi‑speaker builds while maintaining low distortion and reliable performance. Built with a rubber surround, black matte steel basket, and barium ferrite magnet, this pair includes protective grilles and installs easily without needing custom fabrication.
Specification
| Category | Specification |
|---|---|
| SKU | S40 |
| Nominal Diameter | 4″ / 101.6 mm |
| Nominal Impedance | 4 Ohms |
| RMS Power Handling | 40W |
| MAX Power Handling | 120W |
| Sensitivity (1W/1m) | 85 dB |
| Frequency Response | 80Hz-20kHz |
| Recommended Hi Pass Crossover | 120Hz |
| Number of Ways | 2 |
| Pair or Single | Pair |
| Grill Included | Yes |
Woofer Specifications
| Parameter | Value |
|---|---|
| Voice Coil Diameter | 1″ / 25.5 mm |
| Voice Coil Former Material | ASV |
| Winding Material | EISV |
| Cone Material | PPI |
| Surround Material | Rubber |
| Basket Material | Steel |
| Basket Color/Finish | Black Matte |
| Magnet Material | Barium Ferrite |
| Magnet Weight | 5.3 Oz / 150 g |
Thiele & Small Parameters
| Parameter | Value |
|---|---|
| Equivalent Volume | 1.82 L / 0.064 ft³ |
| Excursion (one way) | 2.2 mm |
| Free Air Resonance | 120 Hz |
| Mechanical Factor | 5.677 |
| Electrical Factor | 1.911 |
| Total Factor | 1.429 |
| Mechanical Mass | 6.5 g |
| Mechanical Compliance | 0.444 mm/N |
| BL Factor | 2.35 |
| Voice Coil Inductance | 0.030 mH |
| Cone Area | 55 cm² |
| DC Resistance | 3.7 Ohms |
| Mechanical Mass w/o air | 6 g |
Tweeter Specifications
| Parameter | Value |
|---|---|
| Nominal Diameter | 1″ / 25.5 mm |
| Voice Coil Diameter | 0.5″ / 13.25 mm |
| Voice Coil Former Material | KSV |
| Winding Material | EISVM |
| Diaphragm Material | Mylar |
| Magnet Material | Neodymium |
| Magnet Weight | 1.8 g |
Speaker Measurement
| Parameter | Value |
|---|---|
| Overall Diameter | 4″ / 104 mm |
| Overall Depth | 2.2″ / 56.6 mm |
| Overall Diameter (With Grill) | 5.28″ / 134 mm |
| Overall Depth (With Grill) | 2.73″ / 69.3 mm |
| Front Mount Baffle Cutout | 3.6″ / 92 mm |
| Mounting Depth | 1.67″ / 42.5 mm |
| Motor Diameter | 2.76″ / 70 mm |
| Tweeter Protrusion | 0.37″ / 9.5 mm |
Product Overview
DS18’s S40 is a compact 2-way coaxial speaker that brings DS18’s signature clarity in a form factor that fits nearly anywhere.
Performance in a 4-Inch Frame
With 40W RMS (120W MAX), the S40 is ideal for replacing factory speakers or building out a multi-speaker system. The integrated mylar tweeter delivers smooth high frequencies, while the woofer handles mids with power. The voice coil assembly includes ASV and EISV components for thermal stability and durability, even at louder volumes.
Tuned to Stay Tight
The S40 maintains tight response from 80Hz to 20kHz. Its mechanical design—featuring a rubber surround, black matte steel basket, and a barium ferrite magnet—helps control distortion while preserving output in small enclosures or OEM locations.
Built to Fit, Ready to Play
With a mounting depth of just 1.67″, the S40 installs easily into doors, dashboards, and other tight spaces. It comes with grilles included and is ready to drop into your system without needing custom fabrication.
Make the upgrade and experience the DS18 Difference for yourself!
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