4" 40 Watt RMS 4-Ohm 2-Way Coaxial Speaker Pair w/Tweeter DS18 SELECT Series S40

• Compact & Clear – 4" 2-way coaxial speakers ideal for OEM upgrades and small enclosures.
• Full-Range Output – Integrated mylar tweeter delivers clean, crisp highs.
• Strong Power Handling – 40W RMS / 120W MAX for daily use and consistent performance.
• Durable Build – Steel basket, rubber surround, and ferrite magnet for reliability.
• Easy Installation – Includes grilles and fits most factory openings.

6x9" 80W RMS 4-Ohm 3-Way Coaxial Speaker Pair DS18 SELECT Series / DS-S69

This Listing Includes:

• (2) 4" 40 Watt RMS 4-Ohm 2-Way Coaxial Speakers


• (2) Grilles


• Mounting Hardware


• User Manual

The DS18 S40 brings clear, full-range sound to tight spaces. This 4" 2-way coaxial speaker pair delivers balanced mids and crisp highs with a compact design that fits most factory and aftermarket locations.

Featuring 40W RMS / 120W MAX power handling, these speakers are ideal for upgrading stock systems or expanding multi-speaker builds. The ASV/EISV voice coil assembly provides durability and heat resistance, while the mylar tweeter ensures smooth, distortion-free highs.

A rubber surround, black matte steel basket, and barium ferrite magnet enhance mechanical control and reduce unwanted resonance. With a mounting depth of just 1.67", the S40 installs easily in doors, dashboards, and other tight-fit areas — no custom work required.

Experience reliable performance, tight response from 80Hz–20kHz, and the quality you expect from DS18.

Features:

• Compact 4" Coaxial Design – Perfect for OEM upgrades or tight-space installs.


• 2-Way Configuration – Woofer + tweeter for full-range clarity.


• 40W RMS / 120W MAX – Reliable performance at all listening levels.


• ASV/EISV Voice Coil – Built for heat resistance and long-lasting performance.


• Wide Frequency Range (80Hz–20kHz) – Balanced mids and smooth highs.


• Durable Construction – Rubber surround, PPI cone, and steel basket for longevity.


• Grilles Included – Protects the drivers while maintaining a clean appearance.

Specifications:

• Model: S40


• Nominal Diameter: 4" / 101.6mm


• Nominal Impedance: 4 Ohms


• RMS Power Handling: 40W


• MAX Power Handling: 120W


• Sensitivity (1w/1m): 85dB


• Frequency Response: 80Hz–20kHz


• Recommended Hi-Pass Crossover: 120Hz


• Number of Ways: 2


• Pair or Single: Pair


• Grill Included: Yes

Woofer Specifications

• Voice Coil Diameter: 1" / 25.5mm


• 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: 5.3Oz / 150g

Thiele & Small Parameters

• Equivalent Volume (Vas): 1.82L / 0.064ft


• Excursion (Xmax): 2.2mm


• Free Air Resonance (Fs): 120Hz


• Mechanical Factor (Qms): 5.677


• Electrical Factor (Qes): 1.911


• Total Factor (Qts): 1.429


• Mechanical Mass (Mms): 6.5g


• Mechanical Compliance (Cms): 0.444mm/N


• BL Factor: 2.35


• Voice Coil Inductance (Le): 0.030mH


• Cone Area (Sd): 55cm


• DC Resistance (Re): 3.7 Ohms

Tweeter Specifications

• Nominal Diameter: 1" / 25.5mm


• Voice Coil Diameter: 0.5" / 13.25mm


• Voice Coil Former Material: KSV


• Winding Material: EISVM


• Diaphragm Material: Mylar


• Magnet Material: Neodymium


• Magnet Weight: 1.8g

Dimensions:

• Overall Diameter: 4" / 104mm


• Overall Depth: 2.2" / 56.6mm


• Overall Diameter (With Grill): 5.28" / 134mm


• Overall Depth (With Grill): 2.73" / 69.3mm


• Front Mount Baffle Cutout: 3.6" / 92mm


• Mounting Depth: 1.67" / 42.5mm


• Motor Diameter: 2.76" / 70mm


• Tweeter Protrusion: 0.37" / 9.5mm