Hertz Dieci DP 4.400 4 Channel Stereo Amp Hi Res Class A B Amplifier 500w RMS
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The Hertz Dieci DP 4.400 is a Hi-Res Audio certified 4-channel Class AB car amplifier delivering 500W total power, with 4 x 75W RMS at 4 ohm, bridgeable operation, and a 10 Hz to 45 kHz frequency response. It is part of the Hertz Dieci Power range.
This listing is the DP 4.400 (500W). The Hertz Dieci Power amplifier range is also available as the DP 4.300 (340W).
Key specifications
- Channels: 4, 3 or 2 (bridgeable)
- Amplifier class: AB, Hi-Res Audio certified
- Power (RMS @ 14.4 V, 1% THD): 4 x 75W @ 4 ohm, 4 x 105W @ 2 ohm, 2 x 210W bridged @ 4 ohm
- Bandwidth: 10 Hz to 45 kHz
- Minimum load: 2 ohms (4-channel), 4 ohms (2-channel bridged)
- Operating voltage: 6.5 to 16.5 V DC; fuse 2 x 25 A
- Inputs: Pre-In and Speaker-In (1.6 to 40 V RMS)
- Crossovers: high and low-pass, 50 to 4000 Hz at 12 dB/oct
- S/N ratio: 101 dBA
- Automatic remote turn-on from speaker inputs
Hi-Res Audio and frequency response
Hi-Res Audio certification backs a frequency response of 10 Hz to 45 kHz, ensuring fine musical detail is accurately reproduced across the full audible range and beyond.
Compact 4-channel Class AB design
The DP 4.400 is fully bridgeable and 2Ω stable, offering genuine 4-channel Class AB amplification in a compact footprint. It can be configured in 4, 3 or 2-channel mode to suit a wide variety of car audio system layouts.
Build and aesthetics
The amplifier features a status LED, solid machined terminal block, and a removable top panel that protects controls and connections, giving a clean, integrated appearance in any vehicle.
Universal compatibility and inputs
An operating supply voltage of 6.5 to 16.5 V and Speaker-In sensitivity of 1.6 to 40 V RMS make the DP 4.400 compatible with a wide range of head units, including factory OEM radios. The integrated Universal Speaker Simulator supports seamless connection to OEM systems. Balanced Pre-In and Speaker-In circuitry provides high noise rejection for a clean, interference-free signal.
Controls and outputs
Adjustable input levels, high/low-pass crossover filters (50–4000 Hz, 12 dB/oct), and a bass boost give precise control over the sound. Full-range pre-outs are available regardless of whether Speaker-In or Pre-In inputs are used, adding further flexibility when building or expanding a system. Pair the DP 4.400 with speakers such as the Hertz Dieci DSK 165.3 component speakers for a well-matched Hertz system.
Automatic remote turn-on
The automatic remote turn-on/off function is triggered by OEM radio speaker outputs, removing the need for a dedicated remote turn-on wire and simplifying installation.
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Specification
| Channels | 4 - 3 - 2 |
|---|---|
| Amp class | AB |
| Nominal power supply voltage (fuse) | 11 - 15 VDC (2 x 25 A) |
| Operating power supply voltage | 6.5 - 16.5 VDC |
| Idling current | 0.85 A |
| Standby current draw | 10 uA |
| Remote IN | 4 - 15 VDC (1.5 mA) |
| Efficiency | 60% |
| Damping factor @ 1 kHz, 1W | 130 |
| Bandwidth @ -3 dB | 10Hz - 45kHz |
| S/N ratio (A-weighted @ 1 V Input) | 101 dBA |
| @ 4 Ch | 2 Ω |
| @ 3 Ch | 2 Ω + 2 Ω + 4 Ω |
| @ 2 Ch | 4 Ω |
| Output power (RMS) @ 14.4 VDC, 1% THD | 4 x 75 W @ 4 Ω; 4 x 105 W @ 2 Ω; 2 x 210 W @ 4 Ω bridged |
| Output power (RMS) @ 14.4 VDC, 10% THD | 4 x 90 W @ 4 Ω; 4 x 125 W @ 2 Ω; 2 x 250 W @ 4 Ω bridged |
More specs
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What's Included
- Hertz Dieci DP 4.400
Hertz
About the Hertz DP 4.400
From our tech experts at CEN
A 4-channel amplifier from the Hertz Dieci line, rated at 500w RMS. Enough channels for a front and rear stage, or a front stage with the remaining channels bridged onto a sub.
Who it suits
Drivers who have upgraded their speakers and found the head unit cannot drive them properly. This is the step that makes good speakers sound like good speakers.
Our tech experts advise
Power figures mean little until the amplifier is matched to the speakers and the gains are set with a meter rather than by ear. It needs a fused feed from the battery on the correct cable gauge. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full Hertz range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Hertz
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Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: What wiring do I need to install this amplifier?
A: You will need an amplifier wiring kit sized to the amplifier's power draw, typically including power and earth cable, a fuse, RCA leads and a remote wire. CEN stocks complete wiring kits, and the amplifier's fuse rating is the guide to the cable gauge required.
Q: What class of amplifier is this and does it matter?
A: Class D amplifiers are compact and efficient, ideal for subwoofers and modern installs. Class AB designs are traditionally favoured for outright sound quality on mid and high frequencies. The class is listed in the Specification tab where provided.
Q: Can CEN install this amplifier?
A: Yes. CEN offers professional amplifier installation from our Nottingham premises, including secure mounting, wiring and setup. Contact us to book.
Q: How many channels does the Hertz DP 4.400 have?
A: It is a 4-channel amplifier that can also be configured for 3-channel or 2-channel (bridged) operation.
Q: Can the DP 4.400 connect to a factory head unit?
A: Yes. It has balanced speaker-level inputs (1.6 to 40 V RMS) with a Universal Speaker Simulator and turns on automatically from the radio's speaker outputs.
Q: Is the DP 4.400 Hi-Res certified?
A: Yes. It carries High-Resolution Audio certification, with a bandwidth of 10 Hz to 45 kHz.
Q: How much power does the Hertz DP 4.400 produce?
A: Hertz rates it at 4 x 75W RMS into 4 ohms or 4 x 105W RMS into 2 ohms, and 2 x 210W RMS bridged into 4 ohms (at 14.4 V, 1% THD).
