Hertz DP 4.300 4-Channel Class-AB Car Amplifier – 420W Hi-Res Audio

If you want your entire car audio system — front speakers, rear speakers, and a subwoofer — powered by a single, compact amplifier that doesn't cut corners on sound quality, the Hertz DP 4.300 is exactly what you're looking for. It carries Hi-Res Audio Certification, which means it reproduces frequencies all the way up to 45 kHz, well beyond what standard amplifiers offer. Whether you're building a system from scratch or upgrading a factory setup, the DP 4.300 gives you the flexibility and performance to do it properly.

What is the Hertz DP 4.300?

The Hertz DP 4.300 is a 4-channel Class-AB car audio amplifier from the Hertz DIECI POWER series. It can be configured as a 4-channel, 3-channel, or 2-channel amplifier, making it one of the most versatile options in its class. With fully bridgeable outputs and 2Ω stability across all four channels, it handles everything from component speakers to subwoofers. The Hi-Res Audio Certification sets it apart from most car amplifiers — it's built to reproduce music the way the artist intended, with a frequency response of 10 Hz to 45 kHz and a THD of just 0.015%.

Why Choose the Hertz DP 4.300?

• ✅ Hi-Res Audio Certified — 10 Hz–45 kHz frequency response for studio-quality sound in your car
• ✅ 420W maximum power across 4 fully bridgeable channels
• ✅ Class-AB amplification — the gold standard for low distortion and natural sound reproduction
• ✅ 2Ω stable on all 4 channels — works with a wide range of speaker and subwoofer configurations
• ✅ 3-in-1 flexibility — run it as a 4-ch, 3-ch, or 2-ch amplifier depending on your system
• ✅ Universal OEM compatibility — Speaker-In accepts 1.6–40 Vrms, works with factory head units
• ✅ Automatic Remote Turn-On/Off — no extra wiring needed for OEM installations
• ✅ Balanced input circuitry — eliminates noise and interference for a dead-silent background
• ✅ Ultra-low distortion — THD of just 0.015% at 100 Hz, 70% rated power

Key Features

• Channels: 4 / 3 / 2 (configurable) — run front + rear + bridged sub from a single amp
• Amp Class: AB — Class-AB for the best balance of power efficiency and audio fidelity
• Maximum Power: 420W — across all channels for a complete car audio system
• Hi-Res Audio Certified — frequency response of 10 Hz–45 kHz, certified for high-resolution audio playback
• 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 × 20A) — standard car battery compatible
• Efficiency: 59% — typical for Class-AB, prioritising sound quality over raw efficiency
• S/N Ratio: 100 dBA — exceptional signal-to-noise ratio for a completely quiet background
• THD @ 100 Hz, 70% Rated Power: 0.015% — extremely low distortion for accurate, natural sound
• Damping Factor @ 1 kHz, 1W: 105 — tight, controlled speaker response
• Bandwidth @ -3 dB: 10 Hz–45 kHz — full Hi-Res Audio 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 by OEM radio speaker signal
• Idling Current: 0.8A | Standby Current: 5 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: Most car amplifiers cut off somewhere around 20 kHz — the upper limit of standard human hearing. The DP 4.300 goes all the way to 45 kHz, which is the benchmark for Hi-Res Audio certification. This matters because modern high-resolution audio files (FLAC, DSD, 24-bit WAV) contain information above 20 kHz that adds air, space, and realism to music. With the DP 4.300, you're hearing everything the recording engineer intended, not a compressed version of it.

Class-AB Amplification: Class-AB is the preferred amplifier topology for audiophiles who want the best possible sound quality. Unlike Class-D, which prioritises efficiency, Class-AB operates in a way that minimises crossover distortion — the subtle but audible artefact that occurs when an amplifier switches between its positive and negative output stages. The result is a more natural, musical sound that's particularly noticeable on vocals, acoustic instruments, and high-frequency detail. The DP 4.300's THD of just 0.015% is a direct result of this design philosophy.

Universal Speaker Simulator: Connecting an aftermarket amplifier to a factory head unit is usually complicated by impedance mismatches. The DP 4.300's integrated Universal Speaker Simulator accepts speaker-level inputs from 1.6 to 40 Vrms, covering virtually every OEM radio on the market. This means you can upgrade your sound without replacing your factory head unit, and without needing a separate line output converter in most cases.

ART – Automatic Remote Turn-On/Off: The DP 4.300 detects 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. No remote wire, no relay, no complicated wiring — it just works.

Balanced Input Circuitry: Both the Pre-In and Speaker-In inputs use balanced circuitry, which actively cancels out electrical interference from your car's wiring. Alternator whine, engine noise, and ground loop hum are eliminated before they ever reach the amplifier stage. The 100 dBA signal-to-noise ratio is a direct result of this design — it's one of the quietest car amplifiers in its class.

Benefits

• 🎵 Studio-quality sound in your car — Hi-Res Audio Certification means you hear music as it was recorded
• 🚗 Powers your entire system — front, rear, and bridged subwoofer from a single compact amplifier
• 🔌 Plug-and-play with OEM radios — no line output converter needed in most setups
• 🔇 Dead-silent background — 100 dBA S/N ratio and balanced inputs eliminate all noise
• 🎛️ Full onboard control — adjust input level, crossover, and bass boost without any external processor
• 📦 Compact chassis — fits under seats or in tight boot spaces without sacrificing performance
• ⚡ Minimal battery drain — 0.8A idling current and 5 µA standby draw protect your car battery
• 🛡️ Ultra-low distortion — 0.015% THD means what you hear is exactly what was recorded

Who Should Buy the Hertz DP 4.300?

• Car audio enthusiasts who want Hi-Res Audio quality from a single, compact 4-channel amplifier
• Anyone upgrading from a factory head unit who wants to keep the OEM radio and add amplification
• Installers building complete front + rear + sub systems in a single-amp configuration
• Audiophiles who demand Class-AB sound quality and ultra-low distortion in their car
• Drivers who want a versatile amplifier that can be configured as 4-ch, 3-ch, or 2-ch as their system evolves
• Anyone who listens to high-resolution audio files (FLAC, DSD, 24-bit) and wants an amplifier that can reproduce them faithfully

Technical Specifications

Why Choose Dolphin Accessories?

• ✅ 100% Genuine Products — every product is sourced directly from authorised distributors
• ✅ Expert Guidance — our team understands car audio and helps you build the right system for your vehicle
• ✅ Pan-India Delivery — we ship to every corner of India, fast and reliably
• ✅ Secure Packaging — your amplifier 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 4.300?
A: The Hertz DP 4.300 delivers a maximum power output of 420W across its 4 channels, making it capable of powering a complete car audio system including front speakers, rear speakers, and a bridged subwoofer.

Q: Is the Hertz DP 4.300 Hi-Res Audio certified?
A: Yes. The DP 4.300 carries official Hi-Res Audio Certification with a frequency response of 10 Hz to 45 kHz. This means it can faithfully reproduce high-resolution audio files such as FLAC, DSD, and 24-bit WAV formats.

Q: Can I use the Hertz DP 4.300 with my factory (OEM) head unit?
A: Yes. The DP 4.300 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 4.300 can handle?
A: In 4-channel mode, the DP 4.300 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 ART (Automatic Remote Turn-On/Off) mean?
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: What is the difference between Class-AB and Class-D amplifiers?
A: Class-AB amplifiers like the DP 4.300 prioritise sound quality with very low distortion (0.015% THD), making them the preferred choice for audiophiles. Class-D amplifiers prioritise efficiency and are typically used for subwoofer duty. For full-range speakers, Class-AB is generally considered the better-sounding option.

Q: Can the Hertz DP 4.300 power a subwoofer?
A: Yes. By bridging two channels, the DP 4.300 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: Does the Hertz DP 4.300 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.

Q: What fuse rating does the Hertz DP 4.300 require?
A: It requires two 20A fuses at the nominal operating voltage of 11–15 VDC. Always install fuses as close to the battery as possible for safety.

Q: What is the signal-to-noise ratio of the Hertz DP 4.300?
A: The S/N ratio is 100 dBA (A-weighted at 1V input), which is outstanding for a car amplifier and ensures a completely quiet background with no audible noise or hiss.

Q: Is the Hertz DP 4.300 available with Pan-India delivery?
A: Yes. Dolphin Accessories ships the Hertz DP 4.300 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 4.300 in India?
A: The Hertz DP 4.300 is available at Dolphin Accessories at ₹20,990. This price includes GST and comes with full after-sales support and warranty assistance.