Image Dynamics SQ800.4 800W 4ch. Full Range Digital Amplifier | Previous Demo
Professionally Maintained Demo Units
Every demo unit has been carefully maintained by our certified technicians. These aren't customer returns or damaged goods - they're the same high-quality equipment we've used to demonstrate premium sound to our customers for years.
Pre-Tested & Verified
Unlike typical clearance sales, every item has been tested and verified by our technical team. We stand behind the quality of our relocation inventory.
Everything Must Go Pricing
These aren't regular sale prices - this is genuine "moving warehouse" pricing. Discounts you simply won't find under normal retail circumstances.
Trade Show Display Models
Many items are pristine display models from major audio trade shows - equipment that's been seen but never installed. These pieces often include special editions or limited releases not available through regular retail channels.
Image Dynamics SQ800.4
4-Channel Full Range Amplifier
International Rectifier® Class-D • 800W Total Power • 2-Ohm Stable • Active Crossovers
Hand-Built American Sound Quality Engineering Since 1992
USA Engineering Excellence
Since 1992, Image Dynamics has been the leader in advanced sound quality engineering. Hand-built in Ontario, California, every SQ Series amplifier embodies three decades of competition-winning expertise and uncompromising American craftsmanship.
Competition Proven Heritage
Image Dynamics dominated IASCA and MECA Sound Quality competitions throughout the 1990s. That same obsessive attention to sonic accuracy, imaging precision, and tonal neutrality flows through every SQ Series amplifier component.
Full Range Versatility
Unlike mono subwoofer amps, the SQ800.4 is a true full-range amplifier—power your entire front stage with pristine clarity, or bridge channels for subwoofer duty. Ultimate flexibility for active component systems and multi-amp setups.
Why Serious Audiophiles Choose the SQ800.4
The SQ800.4 isn't a compromise between power and sound quality—it's engineered to deliver both. International Rectifier® Class-D efficiency meets audiophile-grade signal path design, active crossovers with 40-click precision, and the sonic transparency that made Image Dynamics legendary.
International Rectifier® FRD Technology
Full Range Digital (FRD) Class-D architecture built on premium International Rectifier® MOSFETs—developed in partnership with Image Dynamics engineers over years of R&D. Delivers exceptional efficiency, ultra-low distortion (<0.1% THD), and minimal RF interference across the entire 10Hz–30kHz frequency spectrum.
40-Click Precision Active Crossovers
Industry-leading 40-detent rotary controls for both High-Pass (50Hz–300Hz) and Low-Pass (30Hz–300Hz) filters eliminate tuning guesswork. Set exact crossover points for seamless driver integration—no more "somewhere around 80Hz." Independent front/rear crossovers for ultimate system design flexibility.
Selectable Bass EQ (0/+9dB/+18dB)
Three-position bass boost centered at 45Hz (FULL/LPF modes only) compensates for cabin gain and personal preference without muddy mid-bass bloat. Conservative +9dB setting adds punch; +18dB delivers maximum impact for subwoofer duty. Works only when crossover is active—no accidental full-range boost.
Ultra-Low Current Draw & High Efficiency
High-efficiency SMD (Surface Mount Device) circuit technology with 4-layer copper-plated PCB minimizes idle current draw and maximizes power conversion. Class-D topology generates significantly less heat than Class-AB, allowing compact installation without thermal concerns.
Virtual Silence Turn-On/Off Muting
Sophisticated mute circuitry eliminates the annoying "pop" or "thump" when powering the system on or off—critical for preserving tweeter longevity. Combined with quiet switching technology and high-current voltage ripple rejection, this amplifier operates in near silence with zero alternator whine.
2/4 Channel Input Mode Switch
Intelligent input mode switching matches your source unit output—use a single stereo pair to drive all 4 channels (eliminates Y-adapters), or connect front/rear pairs independently for full fader control. Cleaner signal path, less noise, better sound quality.
Technical Specifications
💡 Pro Tip: The 40-click precision crossover controls work with the included reference chart—dial in exact frequencies matching your component speakers' specifications for seamless acoustic integration and phase-coherent soundstaging.
Ultimate System Design Flexibility
🎸 Configuration 1: Full Active Front Stage
Channels 1+2: Front tweeters (HPF 3kHz+)
Channels 3+4: Front midrange/midbass (HPF 80Hz, LPF 3kHz)
Active bi-amping eliminates passive crossover losses, provides precise time alignment capability (via DSP delays), and delivers reference-grade imaging. Add a monoblock for subwoofer duty to complete a competition-level 3-way active system.
🔊 Configuration 2: Full Range + Subwoofers
Channels 1+2: Front components (HPF 80Hz, FULL range)
Channels 3+4: Bridged subwoofer (LPF 80Hz, Bass EQ +9dB)
Classic 2.1 system configuration—front stage handles vocals and instrumentation with full fidelity, bridged rear channels deliver 400W to subwoofer. Perfect for enthusiasts who want clean, powerful bass without adding a separate mono amplifier.
🚗 Configuration 3: Front/Rear Full Range
Channels 1+2: Front components (HPF 80Hz)
Channels 3+4: Rear coaxials (HPF 80Hz or FULL)
Traditional 4-channel setup with independent front/rear tuning. HPF protects speakers from excessive low-frequency excursion while maintaining fader control. Add external subwoofer amplifier for complete system, or bridge channels 3+4 for single sub if rear fill isn't needed.
⚙️ Input Mode Flexibility
2-Channel Input Mode: Single stereo pair drives all 4 channels (eliminates Y-adapters, cleaner signal path)
4-Channel Input Mode: Front/rear pairs controlled independently (full fader control, separate tuning per stage)
Professional Installation Guidelines
🔧 Mounting Location
Compact 7.25" × 10.5" footprint fits under seats, trunk floors, or behind rear seats. Class-D efficiency generates minimal heat, but maintain 2" clearance on all sides for optimal airflow and access to controls.
⚠️ Never mount upside down—compromises heatsink cooling. Avoid mounting on subwoofer enclosures (vibration may cause malfunction).
⚡ Power Requirements
Minimum: 8 AWG power/ground wire (runs <7 feet)
Main Fuse: 60A within 18" of battery
Chassis Fuses: 2 × 30A ATC type
Consult included wire gauge chart for longer runs. Quality ground connection is critical for performance.
🎚️ Gain Structure Setup
Step 1: Set gains to minimum (CCW)
Step 2: Head unit volume to 2/3 max (tone controls flat)
Step 3: Increase gain until distortion begins, back off slightly
⚠️ Gain is NOT a volume control—proper setting critical for sound quality and preventing damage!
⚠️ Critical Crossover Tuning Guidelines
- Component Speakers (Active): HPF at tweeter's Fs × 2 (typically 2-3kHz), LPF for midbass at woofer's natural rolloff (typically 3-4kHz)
- Coaxial/Component (Full Range): HPF at 80Hz protects drivers from excessive excursion while maintaining vocal clarity
- Subwoofer Integration: LPF at 80Hz (Linkwitz-Riley equivalent), adjust by ear for seamless blend with front stage
- Bass EQ Usage: Start at 0dB, increase sparingly—excessive boost causes thermal protection engagement and muddy bass
- 40-Click Precision: Use included reference chart to dial exact frequencies—each click = specific Hz value
Perfect Applications for the SQ800.4
Active Component Systems
The ultimate configuration for sound quality competition. Active bi-amping with precise crossover control eliminates passive network losses, enables perfect time alignment (with DSP), and delivers reference imaging. Independent front/rear tuning allows you to optimize each driver pair separately.
Daily Driver Audiophile Builds
Compact footprint fits in tight spaces without sacrificing sound quality. Full-range capability with active crossovers means you can power entire front stage + bridged subwoofer, or run traditional 4-channel configuration. Class-D efficiency won't drain your battery or stress electrical system.
Multi-Amplifier System Foundation
Perfect foundation for expandable systems. Use SQ800.4 for front stage active components, add SQ600.1D or SQ1200.1D for dedicated subwoofer duty. Matched Image Dynamics SQ Series amplifiers ensure consistent sonic signature and complementary gain structures across the entire system.
What's Included & Condition Details
✅ Complete Package Includes
- Image Dynamics SQ800.4 amplifier
- Owner's manual with detailed wiring diagrams
- 40-click crossover frequency reference chart
- Mounting hardware kit
- Original retail box with factory packaging
⚠️ NOT Included (Sold Separately)
- Power cable (8 AWG or larger required)
- Ground cable (8 AWG or larger required)
- In-line fuse holder & 60A fuse
- RCA interconnect cables (2 or 4 channel)
- Speaker wire (16 AWG minimum, 10 AWG recommended)
EXCELLENT CONDITION • COMPLETE WITH ORIGINAL BOX
This amplifier is in excellent working and cosmetic condition. Carefully inspected, tested, and verified to meet Image Dynamics factory specifications. All features, controls, and protection circuits functioning perfectly.
Condition Highlights:
- Excellent cosmetic condition – minimal to no signs of use
- Complete with original retail box – factory packaging intact
- All accessories included – manual, mounting hardware, reference charts
- Fully tested and verified – all channels, crossovers, and protection circuits confirmed operational
- Ready for immediate installation – exceptional value pricing on proven USA-built quality
Image Dynamics USA offers a 1-year limited warranty on amplifiers (see manual for complete terms and conditions). Keep your dated receipt as proof of purchase for warranty service. Contact Image Dynamics at (909) 930-1377 for support.
Why Serious Enthusiasts Choose Image Dynamics
In a market flooded with inflated power ratings and compromised designs, Image Dynamics represents honest American engineering. Since 1992, they've built a reputation delivering exactly what they promise—measurable performance, competition-grade sound quality, and hand-built reliability.
Competition DNA
Decades of IASCA/MECA SQ titles
Made in USA
Hand-built in Ontario, California
Real Support
Actual engineers answer the phone
Honest Specs
No inflated ratings or marketing BS
Power Your Entire System with Competition-Grade American Engineering
International Rectifier® Full Range Class-D efficiency meets three decades of Image Dynamics sound quality expertise. 800W total power, 40-click precision crossovers, and the transparency that wins competitions—all in excellent condition with original box.
Excellent condition • Complete with original box • Includes all accessories • 1-year Image Dynamics warranty
Image Dynamics SQ800.4 800W 4ch. Full Range Digital Amplifier | Previous Demo
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.