Hertz HDP4 D-Class 4 Channel Amplifier



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HDP 4 is a D-Class four-channel car audio amplifiers, perfect to satisfy any need. It is the most compact HDP; nonetheless, like the other models, it can reach very high power levels: in less than 30 cm (12 inches) it can provide up to 1000W on 2 channels at 4 Ohm! It can be used in full range as well as with crossover settable as Lo-Pass/Hi-Pass. It has been thought to offer the user the maximum possible flexibility, both thanks to Speaker In and RCA inputs and to the controls, with a status monitor communicating to the user through a LEDs system. Using Speaker In inputs, the ART™ ( Automatic Remote Turn On-Off) function is available; the user can also switch it off. HDP 4 is the perfect choice for those who look for performance and non-bulky sizes. The double-extrusion heat sink and the Hertz logo, which is back lit and can be rotated, allow especially sophisticated installations.


Channel mode: 4-3-2 Output
Power (RMS) @ 14.4 VDC
   4 Ch: 150 W x 4 (4Ω)
   4 Ch: 250 W x 4 (2Ω)
   3 Ch: 150 W x 2 (4Ω) + 500 W x 1 (4Ω)
   3 Ch: 250 W x 2 (2Ω) + 500 W x 1 (4Ω)
   2 Ch: 500 W x 2 (4Ω)
   Hi-Pass: 50 ÷ 5k Hz (2 range) @ 12 dB/Oct.
   Lo-Pass: 80 ÷ 3.3k Hz @ 12 dB/Oct.
Distortion - THD (100Hz @ 4Ω): 0.08 %
S/N Ratio (A weighted @ 1V): 100 dB
Damping factor (100Hz @ 4Ω): 50
Size W x D x H mm: 171 x 284 x 46.70



4 LEDs monitor amplifier status and communicate with the user in real time. This system, while allowing the amplifier to operate, also identifies installation faults and leads to eliminate them.


Power supply stage featuring toroidal transformers with multi-layered windings, powerful TO220 Mosfets.


The heatsink boasts extremely efficient thermal conductivity, combined with exclusive cosmetics: scratch-resistant finish, end caps shaped for easy handling, control panel accessible from the top as well as a featured back lit Hertz logo which can also be rotated.


HDP IN system provides to interface with any OEM (through the Speaker In) and aftermarket (through the RCA In) sources. Using Speaker In inputs, the ART (Automatic Remote Turn On-Off) function is available; the user can also switch it off.

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