The Xcelsus Audio DEFINIO 4 represents the pinnacle of Class D amplifier technology, delivering exceptional audio performance in an ultra-compact design. This revolutionary 4-channel digital amplifier combines the efficiency of Class D topology with the sound quality traditionally associated with Class AB amplifiers, making it an ideal choice for discerning audiophiles seeking both power and precision.
Engineered by Swedish audio specialists, the DEFINIO 4 delivers robust 105 watts RMS per channel at 4 ohms, escalating to an impressive 165 watts at 2 ohms. When bridged, this compact powerhouse produces up to 320 watts, revealing its true potential for driving demanding speaker configurations. The amplifier's advanced circuitry ensures pristine audio reproduction with minimal distortion and maximum efficiency.
Superior Audio Engineering
The DEFINIO 4 showcases remarkable technical specifications that set it apart from conventional amplifiers. With a signal-to-noise ratio of 90 dB (A-weighted) and total harmonic distortion below 0.02% at 5W, 1 kHz, this amplifier delivers crystal-clear audio reproduction across its expansive 10 Hz to 40 kHz frequency response. The damping factor exceeding 100 ensures tight control over connected speakers, resulting in accurate bass response and detailed midrange clarity.
Compact Design Meets High Performance
Despite its impressive power output, the DEFINIO 4 maintains an incredibly compact footprint measuring just 41.8 x 104 x 270mm. This space-efficient design makes installation possible in tight spaces while maintaining optimal thermal management. The amplifier's elegant black finish with gold accents adds a premium aesthetic that complements any audio system installation.
Advanced Control Features
The DEFINIO 4 includes sophisticated control options including adjustable high-pass and low-pass filters, allowing precise tuning for various speaker configurations. The included bass remote control provides convenient subwoofer level adjustment from the driver's seat. Input sensitivity ranges from 0.2 to 6V with 5 kohm input impedance, ensuring compatibility with a wide range of source units and audio processors.
Revolutionary Class D Technology with Class AB Sound Quality
The DEFINIO 4 employs cutting-edge Class D switching technology that delivers the warm, natural sound characteristics traditionally associated with Class AB amplifiers while maintaining the efficiency and compact size benefits of digital amplification. This breakthrough design provides high transient response and dynamic performance that accurately reproduces even the most complex musical passages with exceptional clarity and detail.
Ultra-Compact Installation Flexibility
Measuring just over 10 inches in length and less than 2 inches in height, the DEFINIO 4 fits in locations where traditional amplifiers simply cannot. This compact design eliminates the need to sacrifice valuable trunk space or find mounting locations under seats, making it perfect for vehicles with limited installation space. The lightweight construction and efficient heat dissipation allow for flexible mounting orientations without compromising performance.
Comprehensive Filtering and Tuning Capabilities
Advanced crossover controls provide precise frequency management for optimal speaker integration. The adjustable high-pass and low-pass filters allow customization of frequency response to match specific speaker characteristics and listening preferences. Variable gain controls on each channel enable perfect level matching, while the included bass remote provides real-time subwoofer level adjustment for different musical genres and listening environments.
Universal Source Compatibility and Easy Integration
The DEFINIO 4's wide input sensitivity range from 0.2V to 6V ensures seamless compatibility with aftermarket head units, factory radios, and digital signal processors. High-quality RCA inputs accept line-level signals while maintaining signal integrity throughout the amplification process. The amplifier integrates effortlessly into existing audio systems without requiring extensive modifications or additional interface devices.
Professional-Grade Build Quality and Reliability
Swedish engineering excellence is evident in every aspect of the DEFINIO 4's construction. Premium components and advanced circuit board design ensure long-term reliability even under demanding operating conditions. The amplifier's robust thermal management system prevents overheating during extended high-output operation, while comprehensive protection circuits safeguard against electrical faults that could damage connected components.
Energy-Efficient Operation for Extended Performance
Class D technology delivers exceptional power efficiency, reducing electrical system strain and heat generation compared to traditional amplifier designs. This efficiency translates to longer battery life during engine-off listening sessions and reduced alternator load during normal operation. The low idle current consumption makes the DEFINIO 4 an excellent choice for vehicles with sensitive electrical systems or limited charging capacity.
What makes the DEFINIO 4 different from other Class D amplifiers?
The DEFINIO 4 combines advanced Swedish engineering with proprietary Class D technology, delivering Class AB sound quality characteristics. Unlike typical Class D amplifiers that can sound harsh or clinical, the DEFINIO 4 produces warm, natural audio reproduction with exceptional detail and dynamics. The compact design and premium components set it apart from budget alternatives while maintaining competitive pricing.
Can the DEFINIO 4 drive low-impedance speakers safely?
Yes, the DEFINIO 4 is 1-ohm stable and designed to handle demanding speaker loads safely. It delivers 165W RMS per channel at 2 ohms and can drive 1-ohm loads without overheating or activating the protection circuit. The advanced thermal management and robust power supply ensure stable operation even with challenging speaker configurations that would stress lesser amplifiers.
How does the bass remote control function work?
The included bass remote allows real-time adjustment of subwoofer output level from the driver's seat when channels are configured for subwoofer use. This feature enables instant bass level adjustments for various music genres, listening preferences, or acoustic environments, all without leaving your seat. The remote connects via standard cable and provides smooth, precise level control.
What speaker configurations work best with the DEFINIO 4?
The DEFINIO 4 excels with component speaker systems, coaxial speakers, and small subwoofers. Standard configurations include front and rear speakers (4-channel), front speakers plus bridged subwoofer (3-channel), or bridged front speakers with separate subwoofer amplification. The adjustable crossover controls accommodate various speaker types and installation requirements for optimal sound quality.
Does the amplifier require special wiring or installation considerations?
Standard amplifier installation practices apply, with 4-gauge power wire recommended for whole power operation. The compact size allows for mounting in locations that are impossible with larger amplifiers, but adequate ventilation remains essential. RCA inputs accept standard line-level signals, and their wide input sensitivity range accommodates most source units without the need for additional interface equipment.
How does the DEFINIO 4 compare to traditional Class AB amplifiers?
The DEFINIO 4 delivers comparable sound quality to premium Class AB amplifiers while offering significant advantages in size, efficiency, and heat generation. Power output rivals much larger Class AB units, and the advanced Class D design eliminates the warm-up time and power consumption penalties associated with traditional amplifiers. Installation flexibility is dramatically improved due to the compact dimensions.
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What protection features are built into the amplifier?
Comprehensive protection includes thermal shutdown, short circuit protection, reverse polarity protection, and overcurrent limiting. These features safeguard both the amplifier and connected speakers from damage due to installation errors, electrical faults, or extreme operating conditions. The protection circuits are designed to be transparent during normal operation while providing robust safeguards when needed.
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