{"product_id":"ds18-8-400-watt-rms-dual-4-ohm-water-resistant-marine-audio-subwoofer-psw8-4d","title":"DS18 8\" 400 Watt RMS Dual 4-Ohm Water Resistant Marine Audio Subwoofer PSW8.4D","description":"\u003cul\u003e\n\u003cli\u003eSHALLOW-MOUNT POWER BEAST: 8″ subwoofer delivers 400W RMS \/ 800W MAX with a compact 3.5″ mounting depth, perfect for under-seat boxes and tight enclosures that still demand real bass.\u003c\/li\u003e\n\u003cli\u003eDUAL 4-OHM VOICE COILS = FLEXIBLE WIRING: Dual 4-ohm configuration lets you wire series or parallel for easy amplifier matching, cleaner power delivery, and better system tuning.\u003c\/li\u003e\n\u003cli\u003eBUILT FOR HEAT, BUILT TO LAST: Features a 2″ aluminum voice coil, ferrite motor, and water-resistant paper cone with aluminum reinforcement for improved cooling and long-term durability.\u003c\/li\u003e\n\u003cli\u003eDEEP, CONTROLLED LOW-END RESPONSE: Plays down to 20 Hz with a sensitivity of 81 dB, delivering tight, accurate bass that hits hard without overpowering the rest of your system.\u003c\/li\u003e\n\u003cli\u003ePERFECT FOR COMPACT \u0026amp; MARINE BUILDS: Designed for sealed enclosures from 0.35–1.3 cu ft, making it ideal for trucks, boats, powersports, and space-limited installs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eDS18 8\" 400 Watt RMS Dual 4-Ohm Water Resistant Marine Audio Subwoofer PSW8.4D\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eThis Listing Includes\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003e(1) DS18 8\" Marine Subwoofer PSW8.4D\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eThe DS18 PSW8.4D is a shallow-mount 8†dual voice coil subwoofer built to deliver serious low-end impact where space is limited. Rated at 400W RMS \/ 800W MAX, this sub is engineered for tight installs without sacrificing bass authority.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eTight Spaces, Deep Bass. With a 3.5†mounting depth and a total depth of only 4â€, the PSW8.4D fits cleanly into under-seat enclosures, compact truck boxes, and space-restricted builds, while reaching frequencies as low as 20Hz =  Big bass, small footprint.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eDual 4-Ohm Voice Coils = Wiring Flexibility. The dual 4-ohm voice coil design allows series or parallel wiring, giving you more options to match your amplifier and fine-tune your system. That flexibility means cleaner power delivery and more reliable performance at higher output levels.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eBuilt to Hit Hard and Stay Cool: A 2†aluminum voice coil paired with a water-resistant paper cone reinforced with aluminum improves heat dissipation and durability. The ferrite motor, high-roll rubber surround, and solid suspension components are designed for long play sessions at elevated volume without losing control.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eBalanced, Accurate Bass.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eWith an 81dB sensitivity rating and an optimal sealed enclosure volume of 0.35–1.3 ft, the PSW8.4D delivers tight, controlled bass that blends smoothly into your system while still hitting hard when called on. Bring powerful low-end performance to tight mounting spaces with the DS18 PSW8.4D.\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eShallow-mount 8†marine subwoofer for tight installations\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003e400W RMS \/ 800W MAX power handling\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eDual 4-ohm voice coils for flexible wiring configurations\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eWater-resistant paper cone with aluminum reinforcement\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eCompact 3.5†mounting depth ideal for small enclosures\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eDesigned for marine, powersports, and off-road use\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cp\u003eGeneral\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eNominal Diameter: 8 in \/ 203 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eNominal Impedance: Dual 4 Ohm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eRMS Power Handling: 400 Watts\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMAX Power Handling: 800 Watts\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eSensitivity (1W\/1M): 81 dB\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eFrequency Response: 20 Hz – 300 Hz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eRecommended Low-Pass Crossover: 100 Hz\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eMotor\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Diameter: 2 in \/ 50.8 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Former Material: Aluminum\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eWinding Material: Copper\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eCone Material: Water-resistant paper with aluminum reinforcement\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eSurround Material: Rubber\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMagnet Material: Ferrite\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMagnet Weight: 38 oz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eDisplacement Volume: 0.5 L \/ 0.017 cu ft\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eBasket Material: Steel\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eBasket Finish: Matte Black\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eThiele \u0026amp; Small Parameters\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eEquivalent Volume (Vas): 9.38 L \/ 0.33 cu ft\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eExcursion (Xmax, One Way): 8.5 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eFree Air Resonance (Fs): 42 Hz\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMechanical Q (Qms): 4.08\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eElectrical Q (Qes): 1.06\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eTotal Q (Qts): 0.84\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMoving Mass (Mms): 98.43 g\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eCompliance (Cms): 141.08 mm\/N\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eBL Factor: 12.61\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eVoice Coil Inductance (Le): 1.83 mH\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eDiaphragm Area (Sd): 216 sq cm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eDC Resistance (Re): 3.2 + 3.2 Ohms\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eEfficiency Bandwidth Product (EBP): 39.6\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003eRecommended Enclosure\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eSealed Internal Volume Range: 10 – 37 L \/ 0.35 – 1.3 cu ft\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eSealed Box Output Response (F3): 38 – 43 Hz\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e\u003c\/p\u003e\u003cbr\u003e\n\u003cul\u003e\n\u003cbr\u003e\n  \u003cli\u003eOverall Diameter: 8.6 in \/ 220 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eOverall Depth: 4 in \/ 102 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eFront Mount Baffle Cutout: 7.5 in \/ 191 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMounting Depth: 3.5 in \/ 90 mm\u003c\/li\u003e\n\u003cbr\u003e\n  \u003cli\u003eMotor Diameter: 5.27 in \/ 134 mm\u003c\/li\u003e\n\u003cbr\u003e\n\u003c\/ul\u003e","brand":"DS18","offers":[{"title":"Default Title","offer_id":47911593378040,"sku":"DS-PSW8.4D","price":124.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0029\/9384\/8365\/files\/DS18_PSW8.4D_8_Inch_Shallow_Marine_Subwoofer_400W_RMS_Dual_4_Ohm_Main_image.jpg?v=1769092615","url":"https:\/\/bigjeffaudio.com\/products\/ds18-8-400-watt-rms-dual-4-ohm-water-resistant-marine-audio-subwoofer-psw8-4d","provider":"Big Jeff Online Inc","version":"1.0","type":"link"}