Hertz DP 4.400 4-Channel Class-AB Car Amplifier – 500W Hi-Res Audio

When you want the absolute best from a 4-channel car amplifier — lower distortion, more headroom, and a higher damping factor for tighter speaker control — the Hertz DP 4.400 is where the DIECI POWER range steps up. It delivers 500W of maximum power with a THD of just 0.01%, one of the lowest figures you'll find in a car amplifier at this price point. Add Hi-Res Audio Certification, a 101 dBA signal-to-noise ratio, and full OEM compatibility, and you have an amplifier that's genuinely hard to fault.

What is the Hertz DP 4.400?

The Hertz DP 4.400 is a premium 4-channel Class-AB car audio amplifier from the Hertz DIECI POWER series. Like the DP 4.300, it can be configured as a 4-channel, 3-channel, or 2-channel amplifier, but it steps up the performance with 500W maximum power, a damping factor of 130, and an even lower THD of 0.01% at 100 Hz. It carries Hi-Res Audio Certification with a frequency response of 10 Hz to 45 kHz, making it one of the most capable compact 4-channel amplifiers available for car audio use. It is 2Ω stable across all four channels and fully compatible with OEM factory head units via its integrated Universal Speaker Simulator.

Why Choose the Hertz DP 4.400?

• ✅ 500W maximum power across 4 fully bridgeable channels — more headroom than the DP 4.300
• ✅ Ultra-low THD of 0.01% — among the lowest distortion figures in its class
• ✅ Hi-Res Audio Certified — 10 Hz–45 kHz frequency response for studio-quality sound
• ✅ Damping factor of 130 — tighter, more controlled speaker response than the DP 4.300
• ✅ 101 dBA S/N ratio — exceptional signal-to-noise performance for a completely silent background
• ✅ Class-AB amplification — the audiophile standard for natural, low-distortion sound
• ✅ 2Ω stable on all 4 channels — works with a wide range of speaker and subwoofer configurations
• ✅ 3-in-1 flexibility — configure as 4-ch, 3-ch, or 2-ch as your system evolves
• ✅ Universal OEM compatibility — Speaker-In accepts 1.6–40 Vrms, no line output converter needed
• ✅ Automatic Remote Turn-On/Off — seamless OEM integration with no extra wiring

Key Features

• Channels: 4 / 3 / 2 (configurable) — run front + rear + bridged sub from a single amplifier
• Amp Class: AB — Class-AB for the best balance of audio fidelity and power output
• Maximum Power: 500W — 50W more headroom than the DP 4.300 for demanding speaker loads
• Hi-Res Audio Certified — frequency response of 10 Hz–45 kHz, certified for high-resolution audio playback
• THD @ 100 Hz, 70% Rated Power: 0.01% — exceptionally low distortion for natural, accurate sound
• Damping Factor @ 1 kHz, 1W: 130 — tighter bass and more controlled speaker movement
• S/N Ratio: 101 dBA — outstanding signal-to-noise ratio for a completely quiet audio background
• Minimum Load Impedance: 2Ω (4-ch), 2Ω+2Ω+4Ω (3-ch), 4Ω (2-ch) — flexible for any speaker wiring
• Operating Voltage: 6.5–16.5 VDC — compatible with a wide range of vehicle electrical systems
• Nominal Voltage (Fuse): 11–15 VDC (2 × 25A) — higher fuse rating than DP 4.300 to support increased power
• Efficiency: 60% — Class-AB efficiency, prioritising sound quality
• Bandwidth @ -3 dB: 10 Hz–45 kHz — full Hi-Res Audio frequency range
• High/Low-Pass Crossover: 50–4000 Hz @ 12 dB/Oct. — wide range for precise speaker management
• Bass Boost: Yes — onboard bass enhancement control
• Speaker-In Input Sensitivity: 1.6–40 Vrms — direct connection to OEM speaker outputs
• ART (Auto Remote Turn-On): 1.5 VDC — triggered automatically by OEM radio speaker signal
• Idling Current: 0.85A | Standby Current: 10 µA — minimal battery drain at rest
• Full-Range Pre-Outs — available with both Speaker-In and Pre-In inputs
• Adjustable Crossovers: Yes — onboard high and low-pass filters for precise system tuning

Advanced Technologies

Hi-Res Audio Certification: The DP 4.400 is certified for Hi-Res Audio playback, with a frequency response that extends from 10 Hz all the way to 45 kHz. Standard amplifiers typically roll off at 20 kHz — the upper limit of human hearing. The extra headroom to 45 kHz matters when you're playing high-resolution audio files (FLAC, DSD, 24-bit WAV), because these formats contain musical information above 20 kHz that adds air, space, and realism to the sound. The DP 4.400 reproduces all of it faithfully.

Class-AB Amplification with 0.01% THD: Class-AB is the amplifier topology of choice for audiophiles, and the DP 4.400 takes it further than most. Its total harmonic distortion of just 0.01% at 100 Hz and 70% rated power is genuinely exceptional — lower than many dedicated home audio amplifiers. This means the sound you hear is an extremely accurate reproduction of the original recording, with no audible colouration or harshness. Combined with a damping factor of 130, the DP 4.400 also keeps your speakers under tight control, delivering bass that is punchy and precise rather than loose and boomy.

Universal Speaker Simulator: Connecting an aftermarket amplifier to a factory head unit is usually complicated by impedance mismatches between the radio's speaker outputs and the amplifier's line-level inputs. The DP 4.400's integrated Universal Speaker Simulator accepts speaker-level inputs from 1.6 to 40 Vrms, which covers virtually every OEM factory radio on the market. In most installations, no separate line output converter is needed — you simply connect the amplifier directly to the factory speaker wires.

ART – Automatic Remote Turn-On/Off: The DP 4.400 monitors the audio signal from your OEM radio's speaker output and automatically powers on when music plays and off when it stops. It activates at just 1.5 VDC, making it compatible with almost all factory radios without needing a dedicated remote turn-on wire or relay. This makes installation significantly simpler, especially in vehicles where the remote wire is difficult to access.

Balanced Input Circuitry: Both the Pre-In and Speaker-In inputs use balanced circuitry, which actively rejects electrical interference from your car's wiring. The result is a 101 dBA signal-to-noise ratio — one of the best figures in its class — meaning no alternator whine, no engine noise, and no ground loop hum. Just clean, accurate audio from the first note to the last.

Benefits

• 🎵 Hear every detail — Hi-Res Audio Certification and 0.01% THD mean nothing is lost between the recording and your ears
• 🚗 Powers your entire system — front, rear, and bridged subwoofer from a single compact amplifier
• 🔌 Works with your factory radio — Universal Speaker Simulator means no extra converters in most setups
• 🔇 Completely silent background — 101 dBA S/N ratio and balanced inputs eliminate all noise and interference
• 🎸 Tight, controlled bass — damping factor of 130 keeps your speakers moving exactly as they should
• 📦 Compact chassis — fits under seats or in tight boot spaces without compromising on performance
• ⚡ Minimal battery drain — 0.85A idling current and 10 µA standby draw protect your car battery
• 🎛️ Full onboard control — adjust input level, crossover, and bass boost without any external processor

Who Should Buy the Hertz DP 4.400?

• Audiophiles who want the lowest possible distortion from a 4-channel car amplifier
• Anyone upgrading from the DP 4.300 who wants more power, a higher damping factor, and lower THD
• Car audio enthusiasts building a complete front + rear + sub system with Hi-Res Audio playback
• Installers who need a premium, OEM-compatible 4-channel amplifier for high-end client builds
• Drivers who listen to high-resolution audio files (FLAC, DSD, 24-bit) and want an amplifier that does them justice
• Anyone who wants a set-and-forget amplifier with automatic OEM turn-on and full onboard tuning controls

Technical Specifications

Why Choose Dolphin Accessories?

• ✅ 100% Genuine Products — every product is sourced directly from authorised Hertz distributors
• ✅ Expert Guidance — our team understands car audio and helps you build the right system for your vehicle and budget
• ✅ Pan-India Delivery — we ship to every corner of India, fast and reliably
• ✅ Secure Packaging — your amplifier is packed carefully and arrives safely, every time
• ✅ After-Sales Support — we're here after your purchase for installation queries and warranty assistance
• ✅ Trusted by Enthusiasts — thousands of happy customers across India trust Dolphin Accessories for their car audio needs

Frequently Asked Questions

Q: What is the maximum power output of the Hertz DP 4.400?
A: The Hertz DP 4.400 delivers a maximum power output of 500W across its 4 channels, giving you plenty of headroom to power a complete car audio system including front speakers, rear speakers, and a bridged subwoofer.

Q: How does the Hertz DP 4.400 differ from the DP 4.300?
A: The DP 4.400 steps up from the DP 4.300 in three key areas: it delivers 500W versus 420W, has a lower THD of 0.01% versus 0.015%, and a higher damping factor of 130 versus 105. It also uses a larger 2×25A fuse to support the increased power output. The result is more headroom, tighter speaker control, and even lower distortion.

Q: Is the Hertz DP 4.400 Hi-Res Audio certified?
A: Yes. The DP 4.400 carries official Hi-Res Audio Certification with a frequency response of 10 Hz to 45 kHz, making it capable of faithfully reproducing high-resolution audio files such as FLAC, DSD, and 24-bit WAV formats.

Q: Can I use the Hertz DP 4.400 with my factory (OEM) head unit?
A: Yes. The DP 4.400 features an integrated Universal Speaker Simulator that accepts speaker-level inputs from 1.6 to 40 Vrms, covering virtually all OEM factory radios. In most cases, no separate line output converter is needed.

Q: What is the minimum impedance the DP 4.400 can handle?
A: In 4-channel mode, the DP 4.400 is stable down to 2Ω per channel. In 3-channel mode, it handles 2Ω + 2Ω + 4Ω. In 2-channel (bridged) mode, the minimum impedance is 4Ω.

Q: What does a damping factor of 130 mean in practice?
A: The damping factor measures how well an amplifier controls the movement of a speaker cone after a signal stops. A higher damping factor means tighter, more precise bass with less overhang or boominess. The DP 4.400's damping factor of 130 is notably higher than the DP 4.300's 105, which translates to more controlled, accurate bass reproduction.

Q: Can the Hertz DP 4.400 power a subwoofer?
A: Yes. By bridging two channels, the DP 4.400 can be configured as a 3-channel amplifier (front stereo + bridged sub) or a 2-channel bridged amplifier for a single subwoofer. The minimum bridged impedance is 4Ω.

Q: What is ART (Automatic Remote Turn-On/Off) and how does it work?
A: ART detects the audio signal from your OEM radio's speaker output and automatically powers the amplifier on when music plays and off when it stops. It activates at just 1.5 VDC, so no extra remote wire or relay is needed in most OEM installations.

Q: Does the Hertz DP 4.400 have onboard crossovers?
A: Yes. It includes adjustable high/low-pass crossover filters covering 50–4000 Hz at 12 dB/Oct., along with a bass boost control, giving you full system tuning capability without an external processor or DSP.

Q: What fuse rating does the Hertz DP 4.400 require?
A: It requires two 25A fuses at the nominal operating voltage of 11–15 VDC. Always install fuses as close to the battery as possible for safety and to protect your wiring.

Q: Is the Hertz DP 4.400 available with Pan-India delivery?
A: Yes. Dolphin Accessories ships the Hertz DP 4.400 across India with secure packaging and reliable courier partners, so it reaches you safely wherever you are.

Q: What is the price of the Hertz DP 4.400 in India?
A: The Hertz DP 4.400 is available at Dolphin Accessories at ₹30,990. This price includes GST and comes with full after-sales support and warranty assistance.