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Sundown Audio
Sundown Audio SD-4 10 inch Dual 4 Ohm Subwoofer
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Sundown Audio SD-4 10 inch Dual 4 Ohm Subwoofer
Regular price
$ 318.99
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$ 318.99
Regular price
$ 318.99
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Product Details
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Related Products
Sundown Audio SD-4 Series 10" Neo Subwoofer
World-Class Sound Quality | Dual 4Ω Voice Coils
Lightweight Neodymium Motor | Optimized for Small Sealed Enclosures | Previous Display - Never Seen Power
$318.99
Premium Sound Quality Subwoofer | Patented Cast Aluminum Frame | 1-Year Manufacturer Warranty
🎵 WORLD-CLASS SOUND QUALITY IN COMPACT FORM
The Sundown Audio SD-4 Series v.4 10" Neo Subwoofer truly represents a world-class sound quality woofer with low mounting depth, small box requirements, yet extraordinarily high power handling. It's the ideal choice for anyone seeking a high-quality, low-mounting-depth subwoofer that performs like a hammer in small enclosures. With 600 watts RMS power handling, dual 4-ohm voice coils, and lightweight Neodymium motor, the SD-4 delivers enhanced mechanical durability and superb sound quality—the perfect marriage of form and function. Featuring a 2-inch 8-layer copper voice coil, computer-optimized foam "W" surround, and patented high-strength cast aluminum frame, the SD-4 Series v.4 represents Sundown Audio's commitment to engineering excellence and sonic performance.
🎯 SD-4 SERIES V.4 DESIGN FEATURES
- 600 Watts RMS Power Handling: Extraordinarily high power capacity for a sound quality subwoofer optimized for sealed enclosures
- Lightweight Neodymium Motor: Reduces overall weight while maintaining exceptional magnetic field strength and motor control
- 2-Inch 8-Layer Copper Voice Coil: Large diameter coil with multiple layers for elevated power handling and heat dissipation
- Computer-Optimized Foam "W" Surround: Engineered for maximum excursion capability with linear compliance throughout travel range
- Large Aluminum Faraday Ring: Smooth acoustic response with reduced inductance modulation and lower distortion
- Patented Cast Aluminum Frame: High-strength construction provides rigid platform for motor assembly while reducing weight
- Low Distortion Motor Construction: Precision-engineered magnetic circuit minimizes flux modulation and harmonic distortion
- Stitched-On Tinsel Lead Wires: Enhanced mechanical durability prevents lead wire failures even under extreme excursion
📊 COMPLETE TECHNICAL SPECIFICATIONS
Core Performance Specifications
Woofer Diameter
10" (254mm)
Power Handling (RMS)
600 Watts RMS
Sensitivity
82.77 dB @ 1W/1m
Impedance
Dual 4Ω
DC Resistance
7.34Ω
Voice Coil Diameter
2-inch (51mm)
Voice Coil Configuration
8-Layer Copper
Resonant Frequency (Fs)
27.12Hz
Linear Excursion (Xmax)
14.5mm
Thiele-Small Parameters (Dual 4Ω Model)
| Parameter | Value | Significance |
|---|---|---|
| Fs (Resonant Frequency) | 27.12 Hz | Exceptionally low Fs enables deep bass extension—ideal for sealed enclosure designs with extended low-frequency response |
| Qts (Total Q) | 0.5554 | Optimal for sealed enclosures—delivers tight, accurate bass with excellent transient response and minimal overhang |
| Qms (Mechanical Q) | 4.6994 | Well-damped suspension system—provides linear compliance throughout excursion range |
| Qes (Electrical Q) | 0.6299 | Motor provides strong electrical damping—results in tight, controlled bass reproduction |
| Vas (Equivalent Volume) | 39.97 Liters | Moderate compliance allows compact sealed enclosures (0.5-0.75 cu.ft.) while maintaining excellent performance |
| Xmax (Linear Excursion) | 14.5mm | Excellent excursion capability for sound quality subwoofer—enables high output with low distortion |
| Mms (Moving Mass) | 164.03 grams | Well-balanced moving mass—delivers strong transient response without sacrificing output capability |
| BL (Force Factor) | 18.05 T·m | Very strong motor force—provides exceptional control and damping for accurate bass reproduction |
| Cms (Suspension Compliance) | 209.95 µm/N | Moderate compliance—suspension engineered specifically for small sealed enclosure optimization |
| Le (Voice Coil Inductance) | 9.12 mH @ 1kHz | Moderate inductance—Faraday ring minimizes inductance modulation for smooth high-frequency roll-off |
| Sensitivity (1W/1m) | 82.77 dB | Moderate sensitivity—optimized for sealed enclosure sound quality rather than maximum efficiency |
🔬 LIGHTWEIGHT NEODYMIUM MOTOR TECHNOLOGY
The SD-4 Series v.4's lightweight Neodymium motor represents a significant engineering advantage over traditional ferrite magnet designs. Neodymium magnets deliver exceptional magnetic field strength in a compact, lightweight package—reducing overall subwoofer weight by approximately 40-50% compared to equivalent ferrite motors. This weight reduction simplifies installation (especially in applications with weight constraints), reduces shipping costs, and makes the SD-4 ideal for motorcycle, marine, and powersports applications where every pound matters. Despite the reduced weight, the Neodymium motor maintains extraordinary magnetic flux density for strong motor control and low distortion.
⚡ NEODYMIUM MOTOR ADVANTAGES
Reduced Weight without Performance Compromise: Neodymium's exceptional magnetic strength-to-weight ratio allows the SD-4 to achieve 600W RMS power handling while weighing significantly less than ferrite-motor equivalents.
Enhanced Installation Flexibility: Lighter weight simplifies mounting in challenging locations—under seats, in motorcycle saddle bags, behind seats in crew-cab trucks. Less weight stress on mounting surfaces.
Improved Transient Response: Reduced overall mass (motor + cone assembly) can improve transient response in some applications—faster attack and decay characteristics.
Compact Motor Profile: Neodymium magnets achieve high flux density in smaller volume—contributes to SD-4's low 4.43" mounting depth for tight-space installations.
Enhanced Installation Flexibility: Lighter weight simplifies mounting in challenging locations—under seats, in motorcycle saddle bags, behind seats in crew-cab trucks. Less weight stress on mounting surfaces.
Improved Transient Response: Reduced overall mass (motor + cone assembly) can improve transient response in some applications—faster attack and decay characteristics.
Compact Motor Profile: Neodymium magnets achieve high flux density in smaller volume—contributes to SD-4's low 4.43" mounting depth for tight-space installations.
2-Inch 8-Layer Copper Voice Coil
The 2-inch diameter, 8-layer copper voice coil is central to the SD-4's 600W RMS power handling capability. The large 51mm diameter provides increased surface area for heat dissipation, while the 8-layer configuration distributes current across multiple windings to reduce thermal stress on individual conductors. Copper's superior electrical conductivity compared to aluminum delivers lower DC resistance and enhanced power transfer efficiency. Combined with high-temperature voice coil wire construction, the SD-4's coil maintains integrity even under sustained high-power operation—critical for sound quality applications where thermal compression must be minimized.
Computer-Optimized Foam "W" Surround
Sundown Audio engineered the SD-4's foam "W" surround using computer optimization to maximize linear excursion capability while maintaining consistent compliance throughout the travel range. The "W" profile (visible in the surround's cross-section) provides controlled restoring force that remains linear even at high excursion levels—preventing surround collapse and maintaining accurate bass reproduction. Foam material offers excellent damping characteristics compared to rubber or cloth surrounds, terminating unwanted resonances that would otherwise color the acoustic output. The result is a surround that enables the SD-4's 14.5mm Xmax with minimal distortion and exceptional linearity.
📐 OFFICIAL ENCLOSURE RECOMMENDATIONS
The SD-4 Series v.4 is optimized specifically for small, sealed enclosures—ported designs are NOT recommended by Sundown Audio. The subwoofer's Thiele-Small parameters (Qts 0.5554, Fs 27.12Hz) are engineered to deliver exceptional performance in sealed boxes ranging from 0.5 to 0.75 cubic feet.
Sealed Enclosure Specifications
| Specification | Value | Description |
|---|---|---|
| Recommended Volume | 0.5 - 0.75 cu.ft. | Net internal volume after subwoofer displacement (0.09 cu.ft.) |
| Optimal Volume | 0.625 cu.ft. | Middle of recommended range—balances extension with transient response |
| Minimum Volume | 0.5 cu.ft. | Tightest, most accurate bass—ideal for applications prioritizing transient response over maximum output |
| Maximum Volume | 0.75 cu.ft. | Enhanced low-frequency extension—slight sacrifice in transient response for deeper bass |
| Ported Enclosure | NOT RECOMMENDED | SD-4 Series v.4 is engineered specifically for sealed applications—ported designs will compromise performance |
Physical Dimensions & Mounting Requirements
| Dimension | Specification | Installation Consideration |
|---|---|---|
| Mounting Depth | 4.43 inches (112.5mm) | Shallow mounting depth perfect for under-seat installations, slim enclosures, space-constrained applications |
| Outside Diameter | 10.86 inches (275.8mm) | Overall basket diameter—verify enclosure opening accommodates full frame with adequate clearance |
| Cutout Diameter | 9.20 inches (233.7mm) | Mounting hole diameter for flush installation—use router or jigsaw for precision cutting |
| Displacement Volume | 0.09 cu.ft. (2.55 liters) | Subwoofer displaces this volume—must be added to desired net volume when building enclosure |
⚠ CRITICAL ENCLOSURE REQUIREMENTS
- Sealed Enclosure ONLY: SD-4 Series v.4 is NOT designed for ported installations—ported enclosures will result in over-excursion and compromised performance
- Volume Precision: Build enclosure to exact Sundown specifications (0.5-0.75 cu.ft. net)—volume directly affects frequency response and power handling
- Internal Bracing: Add internal bracing to enclosure panels—reduces panel flex that would otherwise absorb acoustic output and degrade transient response
- Polyfill Damping: Add 12-16 oz polyfill for acoustic damping—simulates slightly larger enclosure and smooths frequency response
- Airtight Construction: Seal all seams and joints—air leaks compromise sealed enclosure performance and reduce bass output
- Displacement Calculation: Add 0.09 cu.ft. to desired net volume—total gross volume = net volume + 0.09 cu.ft. displacement
- MDF or Birch Plywood: Use 0.75" MDF or 0.75" Baltic Birch plywood—provides rigid, acoustically inert enclosure walls
🚀 PERFORMANCE ANALYSIS & AMPLIFIER REQUIREMENTS
Power & Amplification Specifications
⚡ RECOMMENDED AMPLIFIER SPECIFICATIONS
Optimal Power Range: 400-600 Watts RMS @ 1Ω or 2Ω (depending on voice coil wiring configuration)
Wiring Options: Dual 4Ω voice coils can be wired for 2Ω (series) or 1Ω (parallel) final impedance—match amplifier's stable impedance rating
Minimum Recommended: 300 Watts RMS for adequate dynamic range and headroom—underpowering can cause clipping and thermal damage
Maximum Safe Power: 800 Watts RMS (conservative ceiling for thermal management and longevity)
Amplifier Quality Critical: Class AB or high-quality Class D monoblock required. Recommended: Professional monoblock amplifiers rated 600-800W RMS @ 1Ω.
Subsonic Filter MANDATORY: 25Hz @ 24dB/octave subsonic protection essential for sealed enclosures—prevents over-excursion below usable bass range
Wiring Options: Dual 4Ω voice coils can be wired for 2Ω (series) or 1Ω (parallel) final impedance—match amplifier's stable impedance rating
Minimum Recommended: 300 Watts RMS for adequate dynamic range and headroom—underpowering can cause clipping and thermal damage
Maximum Safe Power: 800 Watts RMS (conservative ceiling for thermal management and longevity)
Amplifier Quality Critical: Class AB or high-quality Class D monoblock required. Recommended: Professional monoblock amplifiers rated 600-800W RMS @ 1Ω.
Subsonic Filter MANDATORY: 25Hz @ 24dB/octave subsonic protection essential for sealed enclosures—prevents over-excursion below usable bass range
Dual 4Ω Voice Coil Wiring Configurations
| Configuration | Final Impedance | Amplifier Output | Recommended For |
|---|---|---|---|
| Series Wiring | 8Ω | Lower power output | NOT RECOMMENDED—most monoblock amplifiers deliver minimal power @ 8Ω |
| Parallel Wiring | 2Ω | Moderate-high power | RECOMMENDED for 2Ω-stable amplifiers—delivers 400-500W RMS from quality monoblocks |
| Parallel Wiring | 1Ω | Maximum power | RECOMMENDED for 1Ω-stable amplifiers—delivers full 600-800W RMS for maximum performance |
82.77 dB Sensitivity Analysis
The SD-4's 82.77 dB sensitivity (1W/1m) is moderate for a sound quality subwoofer optimized for sealed enclosures. This sensitivity level indicates the subwoofer produces 82.77 dB SPL when driven with 1 watt at 1 meter distance. While lower than high-efficiency designs (90+ dB), this moderate sensitivity is intentional for sound quality applications—the SD-4 prioritizes accuracy, low distortion, and transient response over maximum efficiency. The trade-off means the SD-4 requires adequate amplifier power to achieve high output levels, but rewards proper amplification with exceptional sonic performance. In practical terms, pair the SD-4 with a 600W RMS monoblock to realize its full potential.
27.12Hz Resonant Frequency Advantage
The 27.12Hz resonant frequency (Fs) is exceptionally low for a 10-inch subwoofer—and represents one of the SD-4's most significant performance advantages. Combined with the 0.5554 Qts (optimized for sealed enclosures), this low Fs enables extended low-frequency response down to approximately 30-35Hz (-3dB) in properly designed sealed boxes. This deep bass extension is remarkable for a compact 10-inch driver in small enclosures (0.5-0.75 cu.ft.), delivering infrasonic capability typically reserved for larger 12" or 15" subwoofers. The SD-4's ability to reproduce the lowest frequencies in music (kick drums, bass synths, orchestral bass) with authority demonstrates Sundown Audio's engineering excellence.
📈 COMPETITIVE ANALYSIS: SD-4 SERIES DOMINANCE
| Feature | Sundown SD-4 10" | Typical 10" SQ Subwoofers | SD-4 Advantage |
|---|---|---|---|
| Power Handling | 600W RMS | 300-400W RMS (typical) | 50-100% more power handling—exceptional for sealed SQ subwoofer |
| Motor Design | Lightweight Neodymium | Ferrite Magnet (typical) | 40-50% weight reduction without performance compromise |
| Mounting Depth | 4.43 inches | 5.5-6.5 inches (typical) | 1-2 inches shallower—ideal for under-seat and tight-space installations |
| Resonant Frequency (Fs) | 27.12Hz | 30-35Hz (typical) | 3-8Hz lower Fs enables deeper bass extension in sealed enclosures |
| Voice Coil Diameter | 2-inch (51mm) | 1.5-1.75" (typical) | Larger coil diameter improves power handling and heat dissipation |
| Enclosure Requirements | 0.5-0.75 cu.ft. | 1.0-1.5 cu.ft. (typical) | 50% smaller enclosure requirements—perfect for space-constrained applications |
| Frame Construction | Patented Cast Aluminum | Stamped Steel (typical) | Superior strength-to-weight ratio, enhanced rigidity, reduced resonance |
🎯 TARGET CUSTOMER: WHO SHOULD BUY THE SD-4?
- Sound Quality Enthusiasts: Demand exceptional fidelity, accuracy, and low distortion—SD-4 delivers world-class SQ in sealed enclosures
- Space-Constrained Installations: Limited enclosure space (0.5-0.75 cu.ft.)—SD-4 performs like a hammer in small boxes where larger subs fail
- Under-Seat Applications: 4.43" mounting depth fits under most vehicle seats—Neodymium motor reduces weight stress on mounting surfaces
- High-Power Users: Have quality amplification (600W RMS monoblock)—SD-4's 600W RMS power handling rewards proper amplifier pairing
- Sealed Enclosure Preference: Prefer tight, accurate bass over ported efficiency—SD-4 is optimized specifically for sealed designs
- Weight-Sensitive Applications: Motorcycle, marine, powersports—Neodymium motor significantly reduces overall system weight
- Sundown Audio Fans: Appreciate Sundown's engineering philosophy and build quality—SD-4 Series v.4 represents flagship SQ platform
🔧 SYSTEM INTEGRATION & COMPANION PRODUCTS
Recommended Amplifiers for SD-4 10"
⚡ PREMIUM AMPLIFIER PAIRINGS
Monoblock Amplifiers (600-800W RMS @ 1Ω): Browse professional monoblock amplifiers for optimal SD-4 performance. Class AB or high-quality Class D designs recommended.
1Ω-Stable Amplifiers: Wire SD-4's dual 4Ω coils in parallel for 1Ω final impedance—pair with 1Ω-stable monoblock rated 600-800W RMS @ 1Ω.
2Ω-Stable Amplifiers: Alternative wiring for 2Ω final impedance—pair with 2Ω-stable monoblock rated 400-500W RMS @ 2Ω.
Subsonic Filter Integration: If amplifier lacks built-in subsonic filter, add DSP processor with 25Hz subsonic protection.
Amplifier Gain Setting: Set amplifier gain to match source unit voltage—avoid excessive gain that introduces noise. Use DMM or oscilloscope for precision tuning.
1Ω-Stable Amplifiers: Wire SD-4's dual 4Ω coils in parallel for 1Ω final impedance—pair with 1Ω-stable monoblock rated 600-800W RMS @ 1Ω.
2Ω-Stable Amplifiers: Alternative wiring for 2Ω final impedance—pair with 2Ω-stable monoblock rated 400-500W RMS @ 2Ω.
Subsonic Filter Integration: If amplifier lacks built-in subsonic filter, add DSP processor with 25Hz subsonic protection.
Amplifier Gain Setting: Set amplifier gain to match source unit voltage—avoid excessive gain that introduces noise. Use DMM or oscilloscope for precision tuning.
Complete System Architecture
🎵 BUILDING YOUR SD-4 SYSTEM
Subwoofer Stage: Sundown Audio SD-4 10" (this product) in sealed 0.5-0.75 cu.ft. enclosure—primary low-frequency foundation
Front Component Speakers: Pair with high-quality 6.5" or 6.75" component sets—crossover SD-4 @ 80Hz, front stage @ 80Hz (12dB/octave)
Amplification: 600-800W RMS monoblock for subwoofer (1Ω-stable), 75-100W RMS x 4 for front components—total system power approximately 750-1000W RMS
Signal Processing: Professional DSP processor for time-alignment, EQ optimization, crossover management, and subsonic protection
Enclosure Construction: Build sealed enclosure to exact 0.5-0.75 cu.ft. net volume using 0.75" MDF—add polyfill for acoustic damping
Wiring & Accessories: 4-8 gauge power wire (depending on amplifier), 12-14 gauge speaker wire, inline fuse, distribution blocks—quality wiring critical
Front Component Speakers: Pair with high-quality 6.5" or 6.75" component sets—crossover SD-4 @ 80Hz, front stage @ 80Hz (12dB/octave)
Amplification: 600-800W RMS monoblock for subwoofer (1Ω-stable), 75-100W RMS x 4 for front components—total system power approximately 750-1000W RMS
Signal Processing: Professional DSP processor for time-alignment, EQ optimization, crossover management, and subsonic protection
Enclosure Construction: Build sealed enclosure to exact 0.5-0.75 cu.ft. net volume using 0.75" MDF—add polyfill for acoustic damping
Wiring & Accessories: 4-8 gauge power wire (depending on amplifier), 12-14 gauge speaker wire, inline fuse, distribution blocks—quality wiring critical
🛠 INSTALLATION GUIDELINES & BEST PRACTICES
Professional Installation Recommendations
⚠ CRITICAL INSTALLATION REQUIREMENTS
- Sealed Enclosure ONLY: DO NOT install SD-4 in ported enclosures—will result in over-excursion damage and voided warranty
- Volume Precision: Build enclosure to exact 0.5-0.75 cu.ft. NET volume (after 0.09 cu.ft. displacement)—volume directly affects performance
- Voice Coil Wiring: Verify amplifier's stable impedance rating before wiring—1Ω parallel or 2Ω series configurations available
- Subsonic Filter MANDATORY: 25Hz @ 24dB/octave subsonic protection essential—prevents over-excursion below usable bass range
- Amplifier Power Matching: Use 600W RMS monoblock minimum—underpowering causes clipping and thermal damage
- Polarity Verification: Verify positive/negative connections on both voice coils—incorrect polarity causes cancellation and no output
- Spring-Loaded Terminals: SD-4 uses spring-loaded terminals—tin speaker wire ends or use quality crimp terminals for secure connection
- Authorized Dealer Installation: Purchase from authorized Sundown Audio dealers—unauthorized sellers void warranty
Patented Cast Aluminum Frame Advantage
The SD-4's patented high-strength cast aluminum frame provides exceptional rigidity while reducing weight compared to traditional stamped steel baskets. The cast aluminum construction resists flexing under high excursion, maintaining precise alignment of the voice coil within the magnetic gap. This rigidity is critical for minimizing distortion—any basket flex translates into voice coil misalignment and increased harmonic distortion. The aluminum material also provides excellent heat dissipation, conducting heat away from the motor assembly to maintain lower operating temperatures under sustained high-power conditions.
⭐ EXPERT PERFORMANCE RATING & RECOMMENDATION
💎 WHY THE SD-4 EARNS 4.6/5.0 RATING
The Sundown Audio SD-4 Series v.4 10" Neo Subwoofer truly represents world-class sound quality engineering in a compact, high-power package. The lightweight Neodymium motor reduces weight by 40-50% while maintaining exceptional magnetic field strength. The 600W RMS power handling is extraordinary for a sound quality subwoofer optimized for sealed enclosures. The 27.12Hz resonant frequency enables deep bass extension down to 30-35Hz in properly designed sealed boxes—remarkable for a compact 10-inch driver. The 4.43" shallow mounting depth fits under-seat and tight-space applications where larger subs cannot. Combined with 2-inch 8-layer copper voice coil, computer-optimized foam "W" surround, patented cast aluminum frame, and low distortion motor construction, the SD-4 delivers exceptional performance that justifies the $318.99 investment. For enthusiasts seeking world-class SQ in small sealed enclosures, the Sundown SD-4 is a compelling flagship choice.
✅ KEY ADVANTAGES: SD-4 DOMINANCE
1. Extraordinary Power Handling: 600W RMS power capacity is 50-100% higher than typical 10" SQ subwoofers—enables high output in sealed enclosures
2. Lightweight Neodymium Motor: 40-50% weight reduction versus ferrite motors—ideal for under-seat, motorcycle, marine applications
3. Shallow 4.43" Mounting Depth: 1-2 inches shallower than typical 10" subwoofers—fits tight spaces where others cannot
4. Exceptionally Low 27.12Hz Fs: 3-8Hz lower resonant frequency than competitors—enables deeper bass extension in sealed enclosures
5. Small Enclosure Requirements: 0.5-0.75 cu.ft. volume is 50% smaller than typical 10" requirements—perfect for space-constrained installations
6. Patented Cast Aluminum Frame: Superior strength-to-weight ratio, enhanced rigidity, reduced resonance versus stamped steel
7. 2-Inch 8-Layer Copper Voice Coil: Exceptional heat dissipation and power handling—larger diameter than most competitors
8. Computer-Optimized Surround: Foam "W" surround maximizes linear excursion with minimal distortion—14.5mm Xmax capability
2. Lightweight Neodymium Motor: 40-50% weight reduction versus ferrite motors—ideal for under-seat, motorcycle, marine applications
3. Shallow 4.43" Mounting Depth: 1-2 inches shallower than typical 10" subwoofers—fits tight spaces where others cannot
4. Exceptionally Low 27.12Hz Fs: 3-8Hz lower resonant frequency than competitors—enables deeper bass extension in sealed enclosures
5. Small Enclosure Requirements: 0.5-0.75 cu.ft. volume is 50% smaller than typical 10" requirements—perfect for space-constrained installations
6. Patented Cast Aluminum Frame: Superior strength-to-weight ratio, enhanced rigidity, reduced resonance versus stamped steel
7. 2-Inch 8-Layer Copper Voice Coil: Exceptional heat dissipation and power handling—larger diameter than most competitors
8. Computer-Optimized Surround: Foam "W" surround maximizes linear excursion with minimal distortion—14.5mm Xmax capability
⚠ IMPORTANT CONSIDERATIONS
- Sealed Enclosure ONLY: SD-4 is NOT designed for ported installations—ported enclosures void warranty and cause over-excursion damage
- 82.77 dB Sensitivity: Moderate efficiency demands adequate amplification—600W RMS monoblock recommended for full performance
- Premium Price Point: $318.99 positions SD-4 in upper-tier segment—budget additional $200-300 for quality monoblock amplifier
- Small Enclosure Critical: Must adhere to 0.5-0.75 cu.ft. sealed volume—larger enclosures compromise performance
- 1Ω or 2Ω Amplifier Required: Dual 4Ω coils wire to 1Ω or 2Ω—verify amplifier stability at chosen impedance
- Subsonic Filter Mandatory: 25Hz subsonic protection essential—prevents over-excursion damage below usable bass range
- Authorized Dealer Purchase: Buy from authorized Sundown dealers only—unauthorized sellers void warranty
- Professional Installation Recommended: Proper sealed enclosure construction and voice coil wiring critical for optimal performance
🛡 WARRANTY & SUNDOWN AUDIO SUPPORT
📋 MANUFACTURER WARRANTY & COVERAGE
Warranty Period: 1 Year Limited Manufacturer Warranty (original purchaser only)
Coverage Includes: Defects in materials and workmanship under normal use—Sundown Audio repairs or replaces at their discretion
Warranty Void Conditions: Ported enclosure installation, over-excursion damage, physical abuse, unauthorized modifications, purchase from unauthorized sellers
Authorized Dealer Requirement: Purchase from authorized Sundown Audio dealers ensures full warranty coverage—verify dealer authorization before purchase
Warranty Service: Contact authorized dealer for warranty claims—provide proof of purchase and detailed description of defect
Coverage Includes: Defects in materials and workmanship under normal use—Sundown Audio repairs or replaces at their discretion
Warranty Void Conditions: Ported enclosure installation, over-excursion damage, physical abuse, unauthorized modifications, purchase from unauthorized sellers
Authorized Dealer Requirement: Purchase from authorized Sundown Audio dealers ensures full warranty coverage—verify dealer authorization before purchase
Warranty Service: Contact authorized dealer for warranty claims—provide proof of purchase and detailed description of defect
🌐 ADDITIONAL RESOURCES & INFORMATION
- Official Manufacturer: Sundown Audio (United States)
- Product Page: SD-Series v.4 10" Neo Subwoofer
- Dealer Locator: Find Your Local Authorized Dealer
- 10-Inch Subwoofers Collection: Browse 10" Subwoofer Options
- Monoblock Amplifiers: Professional Monoblock Amplifier Collection
- Component Speakers: High-Quality Component Sets
- Digital Signal Processors: DSP Processor Collection
WORLD-CLASS SOUND QUALITY IN COMPACT FORM
Experience Sundown Audio's flagship sound quality platform with the SD-4 Series v.4. Lightweight Neodymium motor, 600W RMS power handling, 4.43" shallow mounting depth, and 27.12Hz Fs in 0.5-0.75 cu.ft. sealed enclosures. Perfect marriage of form and function—secure your SD-4 today.
📋 SD-4 SERIES V.4 SUMMARY
| Product Name | Sundown Audio SD-4 Series v.4 10" Neo Subwoofer - Dual 4Ω |
| Sale Price | $318.99 |
| Manufacturer | Sundown Audio (United States) |
| Product Category | World-Class Sound Quality Subwoofer |
| Woofer Diameter | 10" (254mm) |
| Motor Design | Lightweight Neodymium (40-50% weight reduction) |
| Voice Coil | 2-inch (51mm) 8-Layer Copper |
| Power Handling | 600 Watts RMS |
| Sensitivity | 82.77 dB @ 1W/1m |
| Impedance | Dual 4Ω (1Ω or 2Ω final wiring options) |
| Resonant Frequency (Fs) | 27.12Hz (Exceptionally Low) |
| Qts (Total Q) | 0.5554 (Optimized for Sealed Enclosures) |
| Linear Excursion (Xmax) | 14.5mm |
| Mounting Depth | 4.43 inches (Shallow Mount) |
| Recommended Enclosure | Sealed 0.5-0.75 cu.ft. (Ported NOT RECOMMENDED) |
| Frame Construction | Patented High-Strength Cast Aluminum |
| Surround Design | Computer-Optimized Foam "W" Surround |
| Warranty | 1 Year Limited Manufacturer Warranty (Authorized Dealers Only) |
| Origin | Sundown Audio (United States) |
| Expert Rating | 4.6/5.0 - EXCEPTIONAL - WORLD-CLASS SQ |
| Recommendation | Ideal for sound quality enthusiasts seeking extraordinary power handling in compact sealed enclosures with shallow mounting depth |
The Sundown Audio SD-4 Series v.4 10" Neo Subwoofer delivers world-class sound quality engineering with lightweight Neodymium motor, 600W RMS power handling, and 4.43" shallow mounting depth. Perfect for sealed enclosures (0.5-0.75 cu.ft.), under-seat installations, and space-constrained applications. Exceptional performance—secure yours today.
