Description
DS18 PSW8.4D
The PSW8.4D is a compact yet powerful 8-inch shallow-mount car subwoofer designed to deliver deep, punchy bass even in tight installation spaces. Featuring dual 4 Ω voice coils for flexible wiring options and a water-resistant paper cone with aluminum reinforcement, it offers strong performance with reliable durability. With a 400 W RMS power handling and 800 W peak power, the PSW8.4D produces rich low frequencies from approximately 20 Hz to 300 Hz, making it ideal for under-seat mounts, small enclosures, trucks, and custom audio builds where space is limited but bass impact is still essential. Its 3.5-inch mounting depth and robust construction help balance compact size with deep bass performance for enthusiast car audio setups.
Specifications
| Parameter | Value |
|---|---|
| Nominal Diameter | 8″ / 203 mm |
| Nominal Impedance | 4 + 4 Ohms |
| RMS Power Handling | 400 W |
| MAX Power Handling | 800 W |
| Sensitivity (1W/1M) | 81 dB |
| Frequency Response | 20–300 Hz |
| Recommended Low-Pass Crossover | 100 Hz |
Motor Specifications
| Parameter | Value |
|---|---|
| Voice Coil Diameter | 2″ / 50.8 mm |
| Voice Coil Former Material | Aluminum |
| Winding Material | Copper |
| Cone Material | Water-resistant paper with aluminum reinforcement |
| Surround Material | Rubber |
| Magnet Material | Ferrite |
| Magnet Weight | 38 oz |
| Displacement Volume | 0.5 L / 0.017 ft³ |
| Basket Material | Steel |
| Basket Finish | Matte Black |
Thiele & Small Parameters
| Parameter | Value |
|---|---|
| Equivalent Volume (Vas) | 9.38 L / 0.33 ft³ |
| Excursion (Xmax, one way) | 8.5 mm |
| Free Air Resonance (Fs) | 42 Hz |
| Mechanical Factor (Qms) | 4.08 |
| Electrical Factor (Qes) | 1.06 |
| Total Factor (Qts) | 0.84 |
| Moving Mass (Mms) | 98.43 g |
| Compliance (Cms) | 141.08 mm/N |
| BL Factor | 12.61 |
| Voice Coil Inductance (Le) | 1.83 mH |
| Diaphragm Area (Sd) | 216 cm² |
| DC Resistance (Re) | 3.2 + 3.2 Ohms |
| Efficiency Bandwidth Product (EBP) | 39.6 |
Recommended Enclosure
| Parameter | Value |
|---|---|
| Sealed Internal Volume Range | 10–37 L / 0.35–1.3 ft³ |
| Sealed Box Output Response (F3) | 43–38 Hz |
Measurements
| Parameter | Value |
|---|---|
| Overall Diameter | 8.6″ / 220 mm |
| Overall Depth | 4″ / 102 mm |
| Front Mount Baffle Cutout | 7.5″ / 191 mm |
| Mounting Depth | 3.5″ / 90 mm |
| Motor Diameter | 5.27″ / 134 mm |
Product Overview
8” Dual Voice Coil Shallow-Mount Subwoofer – 400W RMS / 800W MAX
The PSW8.4D is a shallow-mount 8” subwoofer engineered to deliver serious low-end punch in minimal space.
Tight Spots and Deep Drops
With a mounting depth of just 3.5 inches and a total depth of 4”, the PSW8.4D fits clean into under-seat boxes, truck enclosures, and other compact builds but reaches frequencies as low as 20Hz
Dual 4-Ohm Voice Coils for Flexible Wiring
Wired in series or parallel, the dual 4-ohm voice coils give you options for system matching and amp tuning. That means more control over your setup and more reliable performance under pressure.
Hit Hard and Stay Cool
A 2″ aluminum voice coil and water-resistant paper + aluminum cone allow for better heat dissipation and long-lasting performance. The ferrite motor and high-roll rubber surround deliver strength and stability for extended play at high volume.
Tuned for Accuracy
With a sensitivity of 81dB and an optimal sealed box volume of 0.35–1.3 ft³, the PSW8.4D balances deep bass with tonal precision.
Bring the boom to any mounting space with DS18’s PSW8.4D!
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