Hertz DP 4,400

Hertz DP 4.400 - 4-Channel Class-AB Amplifier with Hi-Res Audio and 1000 W Total Power

The Hertz DP 4.400 is a compact 4-channel amplifier that offers Hi-Res Audio playback and flexible configurations of 4-, 3- to 2-channels. With fully bridgeable Class-AB technology, stable at 2 Ω (multi-channel), and practical features like Auto Turn-On via speaker input, it is designed for reliable, high-performance setups in vehicles. Thanks to its wide frequency response up to 50 kHz and precise filter section, it integrates cleanly with both factory and aftermarket radios. Available at Carhifi.shop.

Technical Highlights

• Channels: 4 / 3 / 2 (fully bridgeable)
• Amplifier Class: AB
• Hi-Res Audio certified; frequency response up to 50 kHz
• Bandwidth (-3 dB): 10 Hz – 45 kHz
• Efficiency: 60 %
• THD: 0.01 % at 100 Hz and 70 % of rated power
• Damping Factor: 130 (1 kHz, 1 W)
• Signal-to-Noise Ratio (A-weighted, 1 V Input): 101 dBA

Power & Operating Modes

• RMS Power @ 1 % THD:
  • 4 Channels @ 4 Ω: 75 W x 4
  • 4 Channels @ 2 Ω: 105 W x 4
  • 3 Channels @ 4 Ω: 75 W x 2 + 210 W x 1
  • 3 Channels @ 2 Ω/4 Ω: 105 W x 2 + 210 W x 1
  • 2 Channels @ 4 Ω: 210 W x 2
• Power @ 14.4 V, 10 % THD:
  • 4 Channels @ 4 Ω: 90 W x 4
  • 4 Channels @ 2 Ω: 125 W x 4
  • 3 Channels @ 4 Ω: 90 W x 2 + 250 W x 1
  • 3 Channels @ 2 Ω/4 Ω: 125 W x 2 + 250 W x 1
  • 2 Channels @ 4 Ω: 250 W x 2
• Total Power: 1000 W
• Minimum Load Impedances:
  • 4-channel operation: 2 Ω
  • 3-channel operation: 2 Ω + 2 Ω + 4 Ω
  • 2-channel operation (bridged): 4 Ω

Connections & Filters

• Inputs: Pre-amplifier (RCA) and Speaker Input
• Pre-amplifier output: Front, Full Range
• Input Sensitivity:
  • Pre-In: 0.32 – 8 VRMS
  • Speaker-In: 1.6 – 40 VRMS
• Crossovers per channel pair (Front/Rear):
  • High-pass: Full / 50 – 4000 Hz, 12 dB/Oct.
  • Low-pass: Full / 50 – 4000 Hz, 12 dB/Oct.
• Bass Boost: 50 Hz, 0 – 9 dB

Power Supply & Control

• Rated Voltage (Fuse): 11 – 15 VDC (2 x 25 A)
• Operating Voltage: 6.5 – 16.5 VDC
• Idle Current: 0.85 A
• Standby Current Consumption: 10 µA
• Maximum Current at Music Power (min. load): 30 A
• Remote IN: 4 – 15 VDC (1.5 mA)
• ART – Automatic On/Off via SPK-IN (BTL radios only), Switching Threshold: 1.5 VDC

Installation & Compatibility

The DP 4.400 operates safely with factory and aftermarket radios. Thanks to high/low-level inputs, Auto Turn-On, and a flexible filter section, you can cleanly integrate front systems, rear speakers, or a sub in bridged operation. The 2-Ω stability in multi-channel operation gives you flexibility in speaker selection and system design.