Hertz DIECI POWER amplifier DP 4.400 is an audio powerhouse designed to elevate your car audio experience to unprecedented heights.
Buyer confidence
88%Highlights
- High-Resolution Audio Certification: Hi-Res Audio certification featuring a frequency response of 10 Hz – 45 kHz.
- Maximum Power in Compact Size: fully bridgeable 4-channel Class-AB 2Ω stable power outputs in a small and compact design.
- Attractive Design: elegant status LED, solid machined terminal block and removable top panel to protect controls and connections.
- Universal Compatibility: operating supply voltage from 9 to 16.5 V and speaker-in input sensitivity from 1.6 to 40 Vrms with integrated Universal Speaker Simulator.
Key specs
Full specs- 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
- Consumption, MIN load impedance (Max Musical Power)
- 30 A
- Remote IN
- 4 ÷ 15 VDC (1.5 mA)
Key specs
Full specs- 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
Highlights
Overview- High-Resolution Audio Certification: Hi-Res Audio certification featuring a frequency response of 10 Hz – 45 kHz.
- Maximum Power in Compact Size: fully bridgeable 4-channel Class-AB 2Ω stable power outputs in a small and compact design.
- Attractive Design: elegant status LED, solid machined terminal block and removable top panel to protect controls and connections.
Overview
Despite its compact size, the DP 4.400 packs a punch with its maximum power output, featuring fully bridgeable 4-channel Class-AB amplification and 2Ω stability. This innovative design allows for a potent audio performance without sacrificing space, making it an ideal choice for those seeking uncompromised sound in a limited footprint.
The amplifier's aesthetics are as impressive as its performance. An elegant status LED, solid machined terminal block, and a removable top panel that safeguards controls and connections contribute to a sleek and sophisticated design that seamlessly integrates into any car interior.
Universal compatibility is a key feature of the DP 4.400, offering an operating supply voltage ranging from 6.5 to 16.5 V and speaker-in input sensitivity from 1.6 to 40 Vrms. The integrated Universal Speaker Simulator enhances versatility, ensuring optimal performance with a wide range of audio sources.
Experience high-noise rejection with the balanced input circuitry of the Pre-in and Speaker-in, allowing for clean and interference-free signal transmission. The full set of controls, including adjustable input levels, high/low-pass crossover filters (50-4000Hz 12dB/Oct.), and bass boost, provides users with the flexibility to fine-tune the audio to their preferences.
Convenience meets intelligence with the Automatic Remote Turn-On/Off feature, seamlessly triggered by OEM radio speaker outputs. This ensures hassle-free operation and an efficient power management system.
Whether utilizing Speaker-In or Pre-In level inputs, the DP 4.400 offers full-range pre-outs, providing further flexibility in system configuration. Elevate your car audio system with the Hertz DIECI POWER Amplifier DP 4.400 – where power, precision, and style converge for an unparalleled listening experience on the road.
Key features
- High-Resolution Audio Certification: Hi-Res Audio certification featuring a frequency response of 10 Hz – 45 kHz.
- Maximum Power in Compact Size: fully bridgeable 4-channel Class-AB 2Ω stable power outputs in a small and compact design.
- Attractive Design: elegant status LED, solid machined terminal block and removable top panel to protect controls and connections.
- Universal Compatibility: operating supply voltage from 9 to 16.5 V and speaker-in input sensitivity from 1.6 to 40 Vrms with integrated Universal Speaker Simulator.
- High-noise rejection: Pre-in and Speaker-in featuring balanced input circuitry.
- Full set of controls: adjustable input levels, high/low-pass crossover filters (50-4000Hz 12dB/Oct.), and bass boost to fine-tune the sound according to your preferences.
- Automatic Remote Turn-On/Off: driven by OEM radio speak
- Full-Range pre-outs: available both when using Speaker-In and Pre-in level inputs.
- Technology
Technologies

Technology
Hi-Res Audio certification featuring a frequency response of 10 Hz – 45 kHz.

Technology
Thanks to the built-in USS technology (Universal Speakers Simulator), DIECI POWER amplifiers can be correctly

Technology
Dieci Power amplifiers are ultra-compact to ensure effortless installations in the increasingly narrow spaces of
Specs
General Specs
| 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 |
| Consumption, MIN load impedance (Max Musical Power) | 30 A |
| Remote IN | 4 ÷ 15 VDC (1.5 mA) |
| ART - Automatic Remote Turn on/off from SPK-IN (BTL radio only) | 1.5 VDC |
| Efficiency | 60% |
| Distortion - THD @ 100 Hz, 70% Rated Power | 0.01% |
| 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 |
| Adjustable Crossovers | yes |
Output Power
| 4Ch @ 4Ω | 75 W x 4 |
| 4Ch @ 2Ω | 105 W x 4 |
| 3Ch @ 4Ω | 75 W x 2 + 210 W x 1 |
| 3Ch @ 2Ω / 4Ω | 105 W x 2 + 210 W x 1 |
| 2Ch @ 4Ω | 210 W x 2 |
| 4Ch @ 4Ω | 90 W x 4 |
| 4Ch @ 2Ω | 125 W x 4 |
| 3Ch @ 4Ω | 90 W x 2 + 250 W x 1 |
| 3Ch @ 2Ω / 4Ω | 125 W x 2 + 250 W x 1 |
| 2Ch @ 4Ω | 250 W x 2 |
| Total Power | 500 W |
INPUTS / FILTERS
| Inputs | Pre-In / Speaker-In |
| Pre Out | Full Range (Front) |
| Pre-In sensitivity | 0.32 ÷ 8 VRMS |
| Speaker-In sensitivity | 1.6 ÷ 40 VRMS |
| Front Ch Hi-Pass | Full / 50-4000Hz 12dB/Oct. |
| Front Ch Lo-Pass | Full / 50-4000Hz 12dB/Oct. |
| Rear Ch Hi-Pass | Full / 50-4000Hz 12dB/Oct. |
| Rear Ch Lo-Pass | Full / 50-4000Hz 12dB/Oct. |
| Bass Boost 50Hz | 0 ÷ 9 dB |
Physical Specs

| Dimension | mm | in |
| A | 335 | 13.19 |
| B | 297 | 11.69 |
| C | 190 | 7.48 |
| D | 166 | 6.53 |
| E | 50 | 1.96 |
| Weight | Kg | lbs |
| 2.88 | 6.35 |
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