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Hertz DP 4.400 4-Channel Class AB Car Amplifier
- 75W RMS x4 at 4 ohms
- 105W RMS x4 at 2 ohms
- 210W RMS x2 bridged
- Hi-Res Audio certified
- RCA and speaker-level inputs
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Product Info
| Brand | HERTZ |
|---|---|
| Model / SKU | DP4-400 |
| UPC | 8018823141895 |
| Availability | In stock and ready to quote |
The Hertz DP 4.400 is a four-channel Class AB car amplifier designed to add clean, configurable power to factory or aftermarket audio systems. It provides 75 watts RMS to each of four channels at 4 ohms, making it well suited to powering upgraded front and rear speakers. Its bridgeable design also allows it to support systems that combine stereo speakers with higher-power channels.
This amplifier is a practical option for listeners who want greater output and control than a head unit can provide without moving to a large amplifier chassis. It is stable down to 2 ohms per channel in four-channel operation and can be configured for four-, three-, or two-channel use. That flexibility supports a range of speaker layouts as a system grows.
The DP 4.400 uses a Class AB output stage with a specified 10 Hz to 45 kHz bandwidth at -3 dB, along with Hi-Res Audio certification covering 10 Hz to 50 kHz. Its 0.01% THD specification at 100 Hz and 70% rated power, 101 dBA signal-to-noise ratio, and balanced input circuitry are intended to support low-noise signal transfer. The result is an amplifier built for detailed full-range speaker amplification rather than subwoofer-only duty.
Installation options include RCA preamp inputs for aftermarket radios and speaker-level inputs for integration with many OEM systems. The built-in Universal Speaker Simulator helps maintain compatibility with source units that monitor speaker load, while ART automatic remote turn-on can activate the amplifier from compatible BTL speaker-level signals. A full-range front pre-out can also feed an additional amplifier.
Independent front and rear high-pass and low-pass filter sections allow the DP 4.400 to be tailored for full-range speakers, component systems, or mixed amplified systems. Each filter section adjusts from 50 Hz to 4,000 Hz with a 12 dB/octave slope, and the rear section includes selectable 50 Hz bass boost. Its compact footprint, protected controls, and solid terminal arrangement make it a capable foundation for a carefully planned vehicle audio upgrade.
Key Features
- Four-Channel Class AB Power: Delivers 75 watts RMS per channel at 4 ohms.
- 2-Ohm Stable Outputs: Supports 105 watts RMS per channel at 2 ohms.
- Bridgeable Channel Design: Provides up to 210 watts RMS per bridged pair.
- Hi-Res Audio Certified: Supports a certified 10 Hz to 50 kHz response range.
- OEM and Aftermarket Inputs: Includes RCA pre-in and speaker-level input connections.
- Adjustable Crossovers: High- and low-pass filters help match speakers and system roles.
Design & Installation
The DP 4.400 uses a compact chassis with a removable top panel that protects its controls and connections. It features a status LED and machined terminal blocks for power and speaker wiring. The amplifier measures 335 x 190 x 50 mm and weighs 2.88 kg.
Use RCA pre-in connections with an aftermarket head unit, or use the speaker-level inputs when retaining a compatible factory radio. Configure each channel pair with its level control and high-pass, low-pass, or full-range setting before finalizing speaker wiring. For bridged operation, use 4-ohm speaker loads and follow the terminal markings and instructions in the supplied documentation.
| Model | DP 4.400 |
|---|---|
| UPC | 8018823141895 |
| Amplifier Type | 4-channel car audio amplifier |
| Channel Configurations | 4 / 3 / 2 channels |
| Amplifier Class | Class AB |
| RMS Power, 4 Channels at 4 Ohms | 75 W x 4 at 1% THD |
| RMS Power, 4 Channels at 2 Ohms | 105 W x 4 at 1% THD |
| RMS Power, 3 Channels at 4 Ohms | 75 W x 2 + 210 W x 1 at 1% THD |
| RMS Power, 3 Channels at 2/4 Ohms | 105 W x 2 + 210 W x 1 at 1% THD |
| RMS Power, 2 Channels Bridged at 4 Ohms | 210 W x 2 at 1% THD |
| Power at 4 Channels, 4 Ohms | 90 W x 4 at 14.4 VDC, 10% THD |
| Power at 4 Channels, 2 Ohms | 125 W x 4 at 14.4 VDC, 10% THD |
| Power at 3 Channels, 4 Ohms | 90 W x 2 + 250 W x 1 at 14.4 VDC, 10% THD |
| Power at 3 Channels, 2/4 Ohms | 125 W x 2 + 250 W x 1 at 14.4 VDC, 10% THD |
| Power at 2 Channels Bridged, 4 Ohms | 250 W x 2 at 14.4 VDC, 10% THD |
| Total Power | 500 W |
| Minimum Load, 4-Channel Mode | 2 ohms |
| Minimum Load, 3-Channel Mode | 2 ohms + 2 ohms + 4 ohms |
| Minimum Load, 2-Channel Mode | 4 ohms |
| Hi-Res Audio Certification Response | 10 Hz to 50 kHz |
| Bandwidth | 10 Hz to 45 kHz at -3 dB |
| Total Harmonic Distortion | 0.01% at 100 Hz, 70% rated power |
| Signal-to-Noise Ratio | 101 dBA, A-weighted at 1 V input |
| Damping Factor | 130 at 1 kHz, 1 W |
| Efficiency | 60% |
| Inputs | RCA pre-in and speaker-in |
| Pre-Out | Full-range front |
| Pre-In Sensitivity | 0.32 to 8 Vrms |
| Speaker-In Sensitivity | 1.6 to 40 Vrms |
| Input Circuitry | Balanced pre-in and speaker-in circuitry |
| Universal Speaker Simulator | Integrated |
| Automatic Remote Turn-On/Off | ART from speaker-in, BTL radio only |
| ART Turn-On Threshold | 1.5 VDC |
| Remote In | 4 to 15 VDC, 1.5 mA |
| Front High-Pass Filter | Full or 50 to 4,000 Hz, 12 dB/octave |
| Front Low-Pass Filter | Full or 50 to 4,000 Hz, 12 dB/octave |
| Rear High-Pass Filter | Full or 50 to 4,000 Hz, 12 dB/octave |
| Rear Low-Pass Filter | Full or 50 to 4,000 Hz, 12 dB/octave |
| Bass Boost | 0 to 9 dB at 50 Hz |
| Nominal Power Supply Voltage | 11 to 15 VDC |
| Operating Power Supply Voltage | 6.5 to 16.5 VDC |
| Fuse Rating | 2 x 25 A |
| Idle Current Draw | 0.85 A |
| Standby Current Draw | 10 µA |
| Maximum Musical Power Consumption | 30 A at minimum load impedance |
| Length | 335 mm / 13.19 in |
| Width | 190 mm / 7.48 in |
| Chassis Width | 166 mm / 6.53 in |
| Height | 50 mm / 1.96 in |
| Secondary Length Dimension | 297 mm / 11.69 in |
| Weight | 2.88 kg / 6.35 lb |
| Included Fuses | Two installed 25A ATO fuses and two spare 25A fuses |
| Included Speaker-Level Harnesses | Two 8-inch, 4-pin harnesses |
| Included Mounting Hardware | Four M4 x 25 mm mounting screws with washers |
Can the DP 4.400 work with a factory radio?
Yes. It has speaker-level inputs with 1.6 to 40 Vrms input sensitivity and an integrated Universal Speaker Simulator. ART automatic remote turn-on is available from compatible BTL radio speaker outputs.
How much power does it deliver?
It delivers 75 watts RMS x 4 at 4 ohms or 105 watts RMS x 4 at 2 ohms, rated at 1% THD. Bridged operation provides 210 watts RMS x 2 at 4 ohms.
Can I bridge this amplifier?
Yes. The amplifier can operate in two-channel bridged mode at 4 ohms, or in three-channel configurations. It is not specified for 2-ohm bridged loads.
What speakers are a good match?
It is appropriate for speakers that can handle its RMS output at the intended impedance. In four-channel use, match speakers to 75 watts RMS at 4 ohms or 105 watts RMS at 2 ohms per channel.
What is included with the amplifier?
The confirmed package contents include the amplifier, two installed 25A ATO fuses, two spare 25A fuses, two speaker-level input harnesses, 4 mm and 2 mm Allen wrenches, four mounting screws, a quick-start guide, and an owner's manual.
Does it have crossovers for component speakers or subwoofers?
Yes. Front and rear channels each have selectable full-range, high-pass, and low-pass filtering from 50 to 4,000 Hz at 12 dB/octave. The rear channels also provide 0 to 9 dB bass boost at 50 Hz.
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