Dual Image Dynamics 8" Sealed Subwoofer System | Previous Display
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Pre-Tested & Verified
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Everything Must Go Pricing
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Trade Show Display Models
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Dual 8" Sealed Subwoofer System
Proline-X P8D-S Enclosure + Image Dynamics ID8 V4 Subwoofers
Complete Turnkey Bass System with Professional Black Carpet Finish
0.8 ft³ Sealed Enclosure + Two 150W RMS Subwoofers
💎 Previous Display Unit — Perfect Condition
This complete system was previously used for showroom display and remains in perfect functional and cosmetic condition. The enclosure features high-quality black carpet covering with rounded edges and professional carpet groove detailing. Includes our upgraded terminal cup for secure, reliable connections. All components tested and verified — delivers identical performance to new units at exceptional value for budget-conscious audiophiles seeking USA-made quality.
Complete Turnkey Bass System: Everything Included
🔊 Proline-X P8D-S Enclosure
CNC-cut dual 8" sealed enclosure featuring 0.8 ft³ internal volume, MDF construction with internal bracing, interlocking design for maximum rigidity. Professional black high-quality carpet covering with rounded edges and carpet groove detailing. Includes upgraded terminal cup for secure wiring. Dimensions: 19" W × 10" H × 13" D.
⚡ Image Dynamics ID8 V4 Subwoofers (Pair)
Two 8" dual 2-ohm subwoofers handling 150W RMS each (300W total system power). Features poly/mica cone, Santoprene surround, hybrid progressive spider, BASV voice coil former for superior heat dissipation. 12.5mm Xmax linear excursion, 31 Hz Fs resonance. Founded 1992 in Ontario, California — hand-built USA sound quality components.
🎯 Ready to Install
Complete plug-and-play system — no guesswork on enclosure design or subwoofer compatibility. Subwoofers are already installed in the enclosure, properly sealed and wired to the terminal cup. Simply connect your amplifier and enjoy tight, accurate sealed bass optimized for musical reproduction. Perfect for compact spaces with 10" height profile.
✨ Complete System Value: Enclosure + Dual Subwoofers + Professional Installation & Wiring — Exceptional savings versus buying components separately and paying for installation labor.
Image Dynamics: Hand-Built USA Sound Quality Since 1992
🏆 SQ Competition Heritage
Founded in 1992 in Ontario, California, Image Dynamics built its reputation by dominating IASCA and MECA sound quality competitions throughout the 1990s. While competitors chased maximum SPL, Image Dynamics obsessed over sonic accuracy, transient response, and low-distortion bass reproduction — establishing the brand as the benchmark for audiophile car audio.
🔬 Engineering Excellence
Image Dynamics products are hand-built with meticulous attention to detail. The ID8 V4 features advanced technologies including BASV (Bonded Aluminum Spider Vent) voice coil formers that actively pull heat from the voice coil for superior power handling, hybrid progressive spiders for controlled excursion, and parabolic Santoprene surrounds ensuring linear cone motion under all conditions.
🎵 Musical Accuracy Philosophy
Image Dynamics engineers prioritize musical reproduction over raw SPL numbers. The ID8 V4's poly/mica cone construction delivers rigidity for strong bass output while preserving all musical nuances — from kick drum transients to bass guitar articulation. The company's motto: "If it doesn't sound good, it doesn't matter how loud it is."
Image Dynamics remains one of the few USA manufacturers still hand-building components in California, maintaining the quality control and attention to detail that defined the golden era of SQ competition audio.
Engineering Excellence: What Makes This System Special
1 Sealed Enclosure: Accuracy Over Boom
The 0.8 ft³ sealed design (0.4 ft³ per subwoofer) falls perfectly within the ID8 V4's recommended 0.2-0.45 ft³ range, delivering the "Universal" alignment that balances extension and control. Sealed enclosures provide flat frequency response, superior transient accuracy, and zero port noise — critical for reproducing musical bass with articulation rather than one-note boom. The ID8 V4's 31 Hz Fs resonance in this enclosure delivers extension down to ~40 Hz with controlled, tight bass reproduction.
Sealed = Studio Monitor bass. Ported = SPL competition boom. For musical accuracy, sealed wins every time.
2 Poly/Mica Cone Technology
The ID8 V4's poly/mica composite cone combines polypropylene's damping properties with mica's rigidity, creating a cone that moves as a perfect piston without flex or breakup. Pure polypropylene cones (common in budget subs) flex at mid-bass frequencies, creating resonance peaks and distortion. Pure paper cones absorb moisture and change characteristics over time. The poly/mica blend delivers strong, distortion-free bass reproduction while preserving all musical nuances — from kick drum attacks to synthesizer sweeps.
Mica reinforcement increases cone rigidity by 40-60% versus pure polypropylene, pushing breakup modes above the subwoofer's operating range.
3 BASV Voice Coil Former Technology
Image Dynamics' proprietary BASV (Bonded Aluminum Spider Vent) voice coil former actively pulls heat from the voice coil and vents it through the spider assembly. Traditional voice coil formers (paper, fiberglass, aluminum) rely on passive convection cooling, which becomes inefficient at high power. The BASV system creates airflow through the spider perforations, reducing voice coil temperatures by 15-25°C under sustained high-power operation. Lower temperatures = better power handling, reduced power compression, longer lifespan.
Voice coil temperature rise is the #1 killer of subwoofers. BASV technology directly addresses this failure mode with active thermal management.
4 Hybrid Progressive Spider Design
The ID8 V4 employs a hybrid progressive spider with variable tension across its corrugations. Near the voice coil, the spider is stiffer, providing precise control and centering force during high-excursion operation. Toward the outer edge, the spider softens, allowing free motion at low excursion levels. This design delivers control and stability at high volumes while maintaining sonic detail at lower listening levels — achieving what single-material spiders cannot: optimal performance across the entire dynamic range.
Progressive spiders prevent "bottoming out" distortion during peak excursion while preserving micro-detail during quiet passages.
5 Parabolic Santoprene Surround
The parabolic Santoprene surround ensures linear cone motion throughout the ID8 V4's 12.5mm Xmax excursion range. Santoprene is a thermoplastic elastomer combining rubber's flexibility with plastic's durability — resisting UV degradation, temperature extremes, and aging better than natural rubber or foam. The parabolic profile (curved rather than accordion-style) provides constant restoring force across the full excursion range, eliminating surround hysteresis that causes distortion and non-linear behavior.
Santoprene maintains consistent compliance from -40°F to +160°F, ensuring predictable bass response regardless of climate conditions.
6 Proline-X CNC Construction Quality
The Proline-X enclosure features CNC-cut MDF panels with interlocking joints and internal bracing, ensuring airtight construction and panel rigidity. The black high-quality carpet covering features rounded edges and carpet groove detailing for a professional OEM-style appearance. The upgraded terminal cup provides secure connections using spade terminals or bare wire, recessed into the rear panel to prevent accidental disconnection. Made in USA with precision manufacturing standards.
Interlocking joints + internal bracing + carpet groove detailing = professional installation quality that rivals custom fabrication at fraction of the cost.
Complete System Specifications
Precision-engineered system combining Proline-X enclosure with Image Dynamics ID8 V4 subwoofers
💡 Recommended Amplifier: This system performs optimally with a mono/bridged amplifier delivering 300-600W RMS @ 2Ω. The series-parallel wiring configuration presents a 2Ω load to your amplifier, maximizing power transfer while maintaining amplifier stability. See owner's manual for detailed wiring diagrams.
Perfect Applications for This Dual 8" System
Compact Car Bass Upgrades
Perfect for sedans, coupes, and hatchbacks where trunk space is precious. The 19" × 10" × 13" footprint delivers serious bass output from a package smaller than a single 12" enclosure. The 10" height fits easily in trunk corners or behind rear seats without blocking sightlines or consuming valuable cargo space. Dual 8" configuration provides more cone area than a single 10" for better efficiency.
Sound Quality Focused Systems
Sealed dual 8" systems excel at SQ competitions and audiophile installations. The tight, controlled bass reproduction with flat frequency response delivers the accurate low-frequency foundation essential for judged sound quality events. Image Dynamics' SQ heritage and BASV cooling technology ensure low-distortion performance under competition power levels. Compact size enables optimal placement for bass integration.
Daily Driver Music Reproduction
For enthusiasts who listen to jazz, classical, acoustic, and vocal-focused genres where bass accuracy matters more than maximum SPL. Sealed enclosures preserve the transient detail and articulation essential for musical bass — you'll hear individual bass guitar notes, kick drum attacks, and synthesizer sweeps as distinct articulations rather than muddy rumble. Perfect for 250-400W amplifiers commonly used in daily driver systems.
Truck Extended Cab Installations
The shallow 10" height fits under extended cab rear seats or in crew cab storage areas. The carpet-covered enclosure blends with OEM interior aesthetics while delivering full bass output without consuming passenger space. Dual 8" configuration provides better efficiency than shallow-mount 10" or 12" subwoofers, extracting more output per watt from your amplifier investment.
Multi-Genre Music Listeners
Sealed enclosures deliver consistent performance across all music genres. Rock gets punchy kick drums, hip-hop gets tight 808s, electronic music gets clean sub-bass, classical gets accurate double bass and timpani reproduction. The ID8 V4's 30-500 Hz frequency response handles everything from deep bass fundamentals through upper bass and lower midrange transitions without artificial coloration or one-note boom.
Turnkey Plug-and-Play Systems
This complete system eliminates the guesswork and labor of building a custom bass system. Subwoofers are already installed, sealed, and wired to the terminal cup — simply connect your amplifier and enjoy optimized bass performance. No need to calculate enclosure volumes, worry about air leaks, or pay installation labor. Professional results with DIY simplicity and exceptional value versus component-only purchases.
💡 Why Sealed 8" Dual Configuration: The Engineering Rationale
Dual 8" vs Single 12": Efficiency and Packaging
Two 8" subwoofers provide 481 cm² of total cone area versus a typical 12" subwoofer's 462 cm² — slightly more cone area pushing air. More importantly, dual 8" systems offer superior packaging efficiency: the shallow 10" height fits spaces where 12" boxes cannot, while the horizontal 19" layout maximizes airspace per square inch of floor space. Dual voice coil wiring flexibility provides multiple impedance options impossible with single subs. Result: similar output to 12" systems in 40% less volume.
0.4 ft³ Per Driver: Universal Sweet Spot
The Proline-X enclosure provides 0.4 ft³ airspace per ID8 V4 subwoofer, falling perfectly within the recommended 0.2-0.45 ft³ sealed range at the "Universal" alignment. This volume achieves system Qtc ~0.6-0.7 — the Butterworth alignment that balances extended low-frequency response with tight transient control. Too small (0.2 ft³) and bass becomes punchy but lacks extension. Too large (0.45 ft³+) and transients become sluggish. The 0.4 ft³ middle ground delivers extension to ~40 Hz with controlled, musical bass reproduction.
300W RMS Total Power: Amplifier Compatibility
The system's 300W RMS total power handling pairs perfectly with common mono/bridged amplifiers in the 300-600W @ 2Ω range — amplifiers that deliver clean, affordable power without requiring massive electrical upgrades. The ID8 V4's 50-350W recommended range per driver means you can run modest power (200-300W total) for daily listening or push full 600W for competition levels. BASV cooling technology ensures reliable operation across this entire power range without thermal compression or voice coil failure.
Black Carpet Finish: Professional OEM Appearance
The high-quality black carpet covering with rounded edges and carpet groove detailing creates an OEM-quality appearance that blends seamlessly with factory trunk interiors. Unlike exposed MDF or cheap box carpet, the Proline-X finish features professional installation details: rounded corners prevent carpet fraying, carpet grooves create clean edge transitions, and the black color matches most vehicle interiors. The result: a system that looks as good as it sounds, suitable for show-quality installations or discreet daily drivers.
📦 Complete System Package Includes
2× Image Dynamics ID8 V4 D2 Subwoofers (Pre-Installed)
1× Proline-X P8D-S Sealed Enclosure (0.8 ft³)
Black High-Quality Carpet Covering (Professional Finish)
Upgraded Terminal Cup (Secure Connections)
Complete Internal Wiring (Subwoofers to Terminal Cup)
Professional Sealed Installation (Airtight Construction)
⚡ Ready to Install: Simply connect your amplifier speaker wires to the terminal cup and secure the enclosure in your vehicle. No additional assembly, sealing, or wiring required — complete turnkey system delivers professional results immediately.
🔧 Professional Installation Tips
1️⃣ Amplifier Selection
Optimal performance with mono/bridged amplifiers delivering 300-600W RMS @ 2Ω. Wire both subwoofers in series-parallel configuration for 2Ω final load. Minimum 300W RMS for adequate headroom; 600W RMS for competition SPL. Ensure amplifier is 2Ω stable (most modern monoblock amplifiers support this).
2️⃣ Wire Gauge Recommendations
For 300-600W amplifiers, use 12 AWG speaker wire for runs under 15 feet, 10 AWG for 15-30 feet. Undersized wire causes voltage drop that reduces output and increases distortion. Terminal cup accepts spade terminals, banana plugs, or bare wire (strip 3/8" and twist tightly).
3️⃣ Secure Enclosure Mounting
Use L-brackets, ratchet straps, or Velcro to secure enclosure to vehicle floor or cargo area. Unsecured enclosures become dangerous projectiles in collisions and shift during cornering, damaging wires. The carpet bottom provides friction but is not sufficient for safety — always mechanically secure the enclosure.
4️⃣ Crossover & Subsonic Settings
Set amplifier low-pass filter (LPF) between 50-100 Hz initially, then tune by ear. Enable subsonic filter at 20-25 Hz (12-18 dB/octave) to eliminate inaudible infrasonic energy. Gain structure: set amplifier gain to match source voltage, NOT for maximum volume — prevents distortion and clipping damage.
5️⃣ Break-In Period
Allow 20-30 hours of moderate volume playback for suspension break-in. During this period, avoid maximum excursion (excessive bass boost or maximum volume) as the spider and surround need time to reach optimal compliance. Bass output and extension improve noticeably after proper break-in as suspension loosens.
6️⃣ Polarity Check
Verify both subwoofers move in the same direction when bass plays — out-of-phase wiring causes cancellation and kills output. Test: play bass-heavy track and place hand near each cone. Both should move outward simultaneously on bass hits. If one moves inward, reverse positive/negative connections on that subwoofer only.
Complete Turnkey Bass System Excellence
This complete dual 8" sealed system delivers professional sound quality results with plug-and-play simplicity. Combining Image Dynamics' USA-made ID8 V4 subwoofers with the precision-engineered Proline-X P8D-S sealed enclosure, this turnkey package eliminates guesswork and installation labor while delivering tight, accurate sealed bass optimized for musical reproduction.
The 300W RMS total power handling pairs perfectly with common mono amplifiers, while the compact 19" × 10" × 13" dimensions fit spaces where larger systems cannot. Professional black carpet finish with upgraded terminal cup ensures OEM-quality appearance worthy of show-winning builds. Whether you're upgrading a daily driver or building an SQ competition system, this complete package delivers exceptional value with professional results.
Display Unit in Perfect Condition • Black Carpet Finish • Upgraded Terminal Cup • Subwoofers Pre-Installed & Wired
Dual Image Dynamics 8" Sealed Subwoofer System | Previous Display
Frequently Asked Questions
Are these items authentic, and why are the prices so low?
This sale includes demo units we've used for customer demonstrations since 2016, new-old-stock from discontinued product lines, display models from trade shows, and carefully curated inventory we've collected over nearly a decade. Most items include original packaging where available.
What types of items are included in the relocation sale?
Our relocation sale includes demo units we've used for customer demonstrations, new old stock from discontinued product lines, and display models from trade shows. All items are genuine products from top car audio brands - we're simply clearing inventory we can't take to our new location. Items range from amplifiers and speakers to processors and accessories accumulated over nearly 10 years at this location.
Do sale items come with manufacturer warranties?
Warranty coverage varies by item and condition. New old stock items typically include full manufacturer warranty if still valid. Demo and display items may have limited or no manufacturer warranty remaining. We clearly state warranty status in each product description. All sales are final on relocation sale items.
How does shipping work for relocation sale items?
We ship relocation sale items using the same careful packaging methods as our regular inventory. Shipping costs are calculated at checkout based on size and weight. For multiple item purchases, we'll combine shipping where possible to save you money. Large items like subwoofer boxes may require freight shipping with additional costs.
Can I return or exchange relocation sale items?
All relocation sale items are sold as-is with no returns or exchanges. We encourage local pickup customers to inspect items before purchasing. For shipped items, we provide detailed descriptions and photos. Since we're relocating, we cannot accommodate returns or warranty service after the sale period ends.