{"product_id":"ds18-x4-ultra-compact-4-channel-class-d-amplifier-140w-rms","title":"X4 DS18 Ultra-Compact Class D 4-Channel Amplifier | 4 x 70W RMS @ 4 Ohms | 1320W Max","description":"\u003ch2\u003eDS18 X4 Ultra-Compact Class D 4-Channel Amplifier | 4 x 70W RMS @ 4 Ohms | 1320W Max \u003c\/h2\u003e\n\u003cp\u003eDon't let its size fool you. The \u003cstrong\u003eDS18 X4\u003c\/strong\u003e is an ultra-compact Class D 4-channel amplifier engineered to deliver impressive full-range power while fitting into installation spaces where traditional amplifiers simply won't fit.\u003c\/p\u003e\n\u003cp\u003eProducing up to \u003cstrong\u003e140 Watts RMS x 4 at 2 Ohms\u003c\/strong\u003e, \u003cstrong\u003e70 Watts RMS x 4 at 4 Ohms\u003c\/strong\u003e, or \u003cstrong\u003e220 Watts RMS x 2 bridged at 4 Ohms\u003c\/strong\u003e, the X4 is an ideal solution for upgrading factory speakers, powering component systems, or adding clean amplification to custom installations without sacrificing valuable space.\u003c\/p\u003e\n\u003cp\u003eBuilt with advanced Class D technology, a four-layer PCB design, premium surface-mount components, and Audio Precision verified sound quality, the X4 combines efficiency, reliability, and performance into one of the most compact amplifiers in the DS18 lineup.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\n\u003cp\u003e✔ Ultra-Compact chassis fits where larger amplifiers can't\u003c\/p\u003e\n\u003cp\u003e✔ Delivers \u003cstrong\u003e140 Watts RMS x 4 @ 2 Ohms\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e✔ Efficient Class D design for clean, reliable performance\u003c\/p\u003e\n\u003cp\u003e✔ Bridgeable to \u003cstrong\u003e220 Watts RMS x 2 @ 4 Ohms\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e✔ Excellent for factory audio upgrades and custom installations\u003c\/p\u003e\n\u003cp\u003e✔ Four-layer PCB design improves durability and efficiency\u003c\/p\u003e\n\u003cp\u003e✔ Audio Precision verified sound quality\u003c\/p\u003e\n\u003cp\u003e✔ Advanced protection circuitry helps safeguard your equipment\u003c\/p\u003e\n\u003cp\u003e✔ Ideal for cars, trucks, Jeeps, motorcycles, and powersports applications (installed in protected locations)\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHidden amplifier installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUnder-seat mounting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBehind-dash installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eClassic and restoration vehicles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTrucks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eJeeps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMotorcycles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUTVs and Side-by-Sides (protected sealed installation)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompact custom audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFactory radio upgrades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eDS18 X4\u003c\/strong\u003e was engineered for enthusiasts who need quality amplification without the space requirements of a traditional amplifier. Its ultra-small footprint makes it possible to install clean, efficient power in vehicles where every inch of available space matters.\u003c\/p\u003e\n\u003cp\u003eDespite its compact size, the X4 delivers impressive RMS power capable of driving aftermarket coaxial speakers, component systems, and high-performance midrange speakers with excellent clarity and dynamic range. Advanced Class D circuitry helps maximize efficiency while minimizing heat, making it an outstanding solution for everyday use and custom installations alike.\u003c\/p\u003e\n\u003cp\u003eConstructed with premium surface-mount technology and a four-layer PCB, the X4 is built for long-term reliability while maintaining a remarkably small footprint. Audio Precision verified sound quality ensures dependable performance that enthusiasts can appreciate.\u003c\/p\u003e\n\u003cp\u003eWhether you're restoring a classic vehicle, upgrading a factory sound system, building a motorcycle audio system, or designing a hidden custom installation, the DS18 X4 provides powerful, efficient performance without demanding valuable installation space.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cp\u003eThe DS18 X4 is an excellent choice for customers looking to add quality amplification while keeping their installation compact and discreet.\u003c\/p\u003e\n\u003cp\u003eIt performs exceptionally well in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eFactory speaker upgrades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eComponent speaker systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFour-speaker audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHidden amplifier installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUnder-seat installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTrucks and SUVs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eJeep audio builds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMotorcycle audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUTV and Side-by-Side builds (protected mounting)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eClassic car restorations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompact custom audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts combination of clean RMS power and ultra-compact dimensions makes it an ideal solution when installation flexibility is just as important as performance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eUltra-Compact Class D 4-Channel Amplifier\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1320 Watts Max Power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e140 Watts RMS x 4 @ 2 Ohms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e70 Watts RMS x 4 @ 4 Ohms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e220 Watts RMS x 2 Bridged @ 4 Ohms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBridgeable 4-Channel Design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFour-Layer PCB Construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePremium Surface-Mount Technology\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAudio Precision Verified Sound Quality\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEfficient Digital Circuit Design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAdvanced Protection Circuitry\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompact Installation-Friendly Chassis\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e DS18\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeries:\u003c\/strong\u003e X Series\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eModel:\u003c\/strong\u003e X4\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e X4\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAmplifier Type:\u003c\/strong\u003e 4-Channel Full-Range\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAmplifier Class:\u003c\/strong\u003e Class D\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eChannels:\u003c\/strong\u003e 4\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePeak Power:\u003c\/strong\u003e 1,320 Watts\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRMS Power @ 4 Ohms:\u003c\/strong\u003e 4 × 70 Watts\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRMS Power @ 2 Ohms:\u003c\/strong\u003e 4 × 140 Watts\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBridged RMS Power @ 4 Ohms:\u003c\/strong\u003e 2 × 220 Watts\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMinimum Impedance:\u003c\/strong\u003e 2 Ohms Stereo \/ 4 Ohms Bridged\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCircuit Design:\u003c\/strong\u003e Class D Digital\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConstruction:\u003c\/strong\u003e Four-Layer PCB with Surface-Mount Components\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAudio Verification:\u003c\/strong\u003e Audio Precision Tested\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProtection Features:\u003c\/strong\u003e Thermal, Overload \u0026amp; Short Circuit Protection\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBridgeable:\u003c\/strong\u003e Yes\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Full-Range Speaker Systems\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e(1) DS18 X4 Ultra-Compact Class D 4-Channel Amplifier\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInstallation Hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOwner's Manual\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eWhat This Amplifier Powers Best\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eDS18 X4\u003c\/strong\u003e is engineered to deliver clean, efficient power for a wide variety of full-range speaker systems while fitting into installation spaces where traditional amplifiers simply aren't practical.\u003c\/p\u003e\n\u003cp\u003eIt is an excellent choice for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eFour aftermarket coaxial speakers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFour component speaker systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFront stage plus rear fill audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-performance OEM speaker upgrades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMotorcycle audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eJeep audio systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUTV and Side-by-Side builds (protected installation)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eClassic vehicle restorations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHidden amplifier installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts combination of compact size and impressive RMS output makes the X4 an outstanding solution for customers who want significantly better sound quality without sacrificing valuable installation space.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eOne of the X4's greatest strengths is its ultra-compact chassis, allowing it to be installed in locations that larger amplifiers simply cannot accommodate.\u003c\/p\u003e\n\u003cp\u003ePopular installation locations include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eUnder front seats\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBehind rear seats\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBehind dashboards\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInside center consoles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUnder cargo floors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustom amplifier racks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMotorcycle saddlebags and fairings (protected locations)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor the best performance, use high-quality OFC power and speaker wire, properly adjust amplifier gain, and configure the crossover settings to match your speakers. Careful tuning helps maximize clarity while protecting both the amplifier and connected speakers.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003ePro Audio Center Tip\u003c\/h3\u003e\n\u003cp\u003eAdding an amplifier isn't just about increasing volume—it's about giving your speakers the clean power they need to perform their best.\u003c\/p\u003e\n\u003cp\u003eEven factory replacement speakers often benefit from dedicated amplification, producing cleaner vocals, stronger midbass, and improved overall detail when driven with adequate RMS power. The X4 is an excellent way to achieve those improvements without requiring a large amplifier or extensive installation space.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eBuild Your System\u003c\/h3\u003e\n\u003cp\u003eComplete your installation with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOFC amplifier wiring kit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePremium RCA interconnects\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-quality speaker wire\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSound deadening material\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eVehicle-specific speaker adapters\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eComponent or coaxial speaker upgrades\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDSP or line output converter for factory radio integration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eExpert Recommendation from Pro Audio Center\u003c\/h3\u003e\n\u003cp\u003eThe DS18 X4 is one of our favorite amplifiers for customers who need maximum installation flexibility without giving up meaningful performance.\u003c\/p\u003e\n\u003cp\u003eIts ultra-compact footprint opens installation possibilities that simply aren't practical with many traditional amplifiers, making it an excellent option for classic cars, trucks, Jeeps, motorcycles, and custom builds where available space is limited.\u003c\/p\u003e\n\u003cp\u003eFor customers looking to dramatically improve speaker performance while keeping their installation clean and discreet, the X4 delivers an outstanding combination of efficiency, reliability, and real-world usability.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWhy Buy From Pro Audio Center?\u003c\/h3\u003e\n\u003cp\u003eAt Pro Audio Center, we believe the best amplifier isn't necessarily the largest one—it's the one that best fits your system and your vehicle.\u003c\/p\u003e\n\u003cp\u003eThat's why we focus on helping customers choose equipment that complements their installation goals, whether you're building a high-performance daily driver, restoring a classic vehicle, or creating a space-conscious custom installation.\u003c\/p\u003e\n\u003cp\u003eEvery product we offer is selected with real-world performance and long-term reliability in mind, so you can shop with confidence knowing you're getting equipment we would proudly install ourselves.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch1\u003eFrequently Asked Questions\u003c\/h1\u003e\n\u003ch4\u003eHow much RMS power does the DS18 X4 produce?\u003c\/h4\u003e\n\u003cp\u003eThe X4 delivers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e4 × 140 Watts RMS @ 2 Ohms\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e4 × 70 Watts RMS @ 4 Ohms\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e2 × 220 Watts RMS Bridged @ 4 Ohms\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch4\u003eCan I bridge this amplifier?\u003c\/h4\u003e\n\u003cp\u003eYes. The X4 can be bridged to provide \u003cstrong\u003e220 Watts RMS × 2 @ 4 Ohms\u003c\/strong\u003e, making it suitable for higher-powered speaker applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch4\u003eIs the X4 a good amplifier for factory speaker upgrades?\u003c\/h4\u003e\n\u003cp\u003eAbsolutely. The X4 is an excellent choice for customers upgrading factory speakers or adding aftermarket component speakers while retaining a compact installation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch4\u003eCan I install the X4 under a seat?\u003c\/h4\u003e\n\u003cp\u003eIn many vehicles, yes. Its ultra-compact chassis makes it ideal for under-seat mounting, behind interior panels, or other tight installation spaces. Always verify available clearance before installation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch4\u003eIs this amplifier suitable for motorcycles and UTVs?\u003c\/h4\u003e\n\u003cp\u003eYes, provided it is installed in a \u003cstrong\u003eprotected location\u003c\/strong\u003e away from direct exposure to the elements. The X4's compact size makes it a popular choice for motorcycles, UTVs, and other space-constrained applications. For installations requiring full weather resistance, consider a dedicated marine-grade amplifier.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch4\u003eIs the X4 a good amplifier for everyday use?\u003c\/h4\u003e\n\u003cp\u003eYes. The efficient Class D design, compact footprint, and clean RMS power make the X4 an excellent amplifier for daily-driven vehicles where improved sound quality and installation flexibility are top priorities.\u003c\/p\u003e","brand":"DS18","offers":[{"title":"Default Title","offer_id":55734257778856,"sku":"X4","price":215.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0631\/9508\/7016\/files\/X4-2000x2000_3000x_jpg.webp?v=1783634503","url":"https:\/\/proaudiocenter.com\/products\/ds18-x4-ultra-compact-4-channel-class-d-amplifier-140w-rms","provider":"Pro Audio Center","version":"1.0","type":"link"}