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Hertz HCP 4

4-channel car amplifier — 50 watts RMS x 4

3 Reviews

Overview

Our take on the Hertz HCP 4

Hertz' HCP 4 four-channel amplifier will deliver 50 watts RMS to each of your vehicle's front and rear speakers, improving the sound quality of your audio system as well as your listening experience. The amp's Class-AB technology gives it lower distortion and higher signal-to-noise ratio than a typical Class-D amplifier of the same configuration and size. The versatile HCP 4 can also be used to run a pair of speakers with the front channels while sending 170 watts RMS to a subwoofer from the bridged rear channels. A selectable bass boost on the rear channels helps your sub sound its best.

Power upgrade

Hertz' HCP 4 four-channel amplifier will deliver 50 watts RMS to each of your vehicle's front and rear speakers, improving the sound quality of your audio system as well as your listening experience. The amp's Class-AB technology gives it lower distortion and higher signal-to-noise ratio than a typical Class-D amplifier of the same configuration and size. The versatile HCP 4 can also be used to run a pair of speakers with the front channels while sending 170 watts RMS to a subwoofer from the bridged rear channels. A selectable bass boost on the rear channels helps your sub sound its best.

Works in almost any system

This amp will work with an aftermarket receiver using RCA connections, or a factory radio using speaker-level wiring and Hertz' ART™ automatic remote turn-on system. If your receiver only has a single L/R output, you can engage the Mono buttons on the front and rear input channels so the amp can power your four speakers from those two inputs.

About Hertz

When you think of Italian cars, you think of style, performance, and awesome sound. Same goes for Italian audio gear. Hertz speakers, subs, and amps have made cars sound super since 1998. Known for great sound and technological innovation, high-end gear from Hertz will bring powerful performance audio to any vehicle or vessel.

Hertz HCP 4

HCP 4 input and control panel

Product Highlights:

  • 4-channel car amplifier
  • 50 watts RMS x 4 at 4 ohms (85 watts RMS x 4 at 2 ohms)
  • 170 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode)
  • CEA-2006 compliant
  • Class-AB amplifier technology
  • frequency response: 10-45,000 Hz
  • switchable high-pass filters (80 Hz, 12 dB/octave) on front and rear channels
  • variable low-pass filters (50-500 Hz, 12 dB/octave) on front and rear channels
  • selectable bass boost (0, 6, 12 dB at 50 Hz) on rear channels
  • mono buttons allow 4 outputs from 2 inputs
Other Features:
  • preamp and speaker-level inputs
    • Automatic Remote Turn-on with speaker-level inputs
  • preamp outputs
  • fuse rating: 20A x 2
  • wiring and hardware not included with amplifier
    • 8-gauge power and ground wire recommended
  • 12-3/8"W x 2"H x 7-1/2"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

What's in the Box:

  • 4-Channel amplifier
  • Four 20A ATO fuses (2 installed)
  • Two 7" Speaker level input harnesses
  • 4mm Allen wrench
  • 2mm Allen wrench
  • Four M4 x 20mm mounting screws
  • 4 Flat washers
  • Quick Start Guide
  • Warranty Card
Reviews

Hertz HCP 4 Reviews

Average Customer Review(s):

(3 Reviews)

Hertz HCP 4

John from New Llano, LA on 2/17/2019

Crutchfield Customer Review (What's this?)

Excellent

Pros:

Cons:

Hertz HCP 4

Frankie from York, PA on 1/24/2019

Crutchfield Customer Review (What's this?)

I have a 2019 Toyota Camry. This Amplifier is running a set of HERTZ HCX 165 6.5" 2-Way Hi-Energy Coaxial Speakers HCX165 and a set of Hertz CPK 165 PRO 6-1/2" Component Speaker System. This amplifier is along with these, speakers, honestly sound amazing.

Pros: Sound quality, build quality, and performance.

Cons: Non at this point.

Awesome value do it all amp.

Jh from Marco Island, FL on 12/29/2018

Crutchfield Customer Review (What's this?)

Used this amp to run my mids in the doors of a Yukon. Very clean and solid sound paired with some Infinity Kappas. Highly recommend this amp for driving mids, have not tried it for subs yet.

Pros: Easy install to factory HU with Art system. Can be used 4 channel for 4 and or 2 ohm.

Cons: None really.

Details

Hands-on research

Product Research

Features

Overview: The Hertz HCP 4 is a 4-channel AB-class car amplifier that can drive up to two pairs of speakers or subwoofers. It is part of the Hertz Compact Power (HCP) series, that features compact chassis and minimized extruded aluminum heat sinks. Heat is transferred away from the internal components and out to the heat sinks where it is dissipated through the sides of the amp. The HCP 4 has both speaker-level and line-level inputs to accommodate factory and aftermarket head units.

CEA-2006 Power Output: The HCP 4 is compliant with the CEA-2006 Amplifier Power Standard, which makes it easy for consumers to compare amplifier power specs from one brand to another. The amplifier's CEA-2006 ratings include:

  • RMS Power (4Ω, ≤ 1% THD+N, 14.4 volts): 50 watts x 4
  • S/N Ratio (ref. 1W output): 82 dBA

Hertz Power Output Specs: Hertz publishes the following power output specs:

  • RMS Output Power (14.4 volts, THD 1%):
    • 4 Channel: 55 watts x 4 (4Ω stereo)
    • 4 Channel: 85 watts x 4 (2Ω stereo)
    • 3 Channel: 55 watts x 2 (4Ω stereo) + 170 watts x 1 (4Ω bridged)
    • 3 Channel: 85 watts x 2 (2Ω stereo) + 170 watts x 1 (4Ω bridged)
    • 2 Channel: 170 watts x 2 (4Ω bridged)
  • RMS Output Power (14.4 volts, THD 10%)
    • 4 Channel: 65 watts x 4 (4Ω stereo)
    • 4 Channel: 95 watts x 4 (2Ω stereo)
    • 3 Channel: 65 watts x 2 (4Ω stereo) + 190 watts x 1 (4Ω bridged)
    • 3 Channel: 95 watts x 2 (2Ω stereo) + 190 watts x 1 (4Ω bridged)
    • 2 Channel: 190 watts x 2 (4Ω bridged)

Auto Remote Turn-On (ART): The HCP 4 features ART (Auto Remote Turn-On) which automatically powers on and off the amplifier when an audio signal (or lack of one) is detected on the speaker-level inputs. This is especially helpful when connecting the amplifier to an OEM radio. It eliminates the need for running a remote lead from the head unit to the amp. ART is only available with Speaker Level inputs.

Amplifier Controls: The versatile Hertz HCP 4 has a full array of filters and controls to help you configure your audio system for maximum performance. The controls are located on one end of the amplifier, and include the following:

  • Level: The rotary Level control lets you match the input of the amplifier to the output of your head unit. The amp will accept either line level (RCA) or speaker level (harness) inputs. The sensitivity range is 0.2V to 5V (preamp level) or 0.8V to 20V (speaker level). There are separate Level controls for the Front and Rear channels.
  • Pass Mode: The amplifier has selectable low pass and high pass filters. This 3-way switch lets you choose Full (no filter), Hi (high pass, fixed at 80Hz), or Lo (low pass, variable from 50 to 500 Hz). There are separate Pass Mode switches for the Front and Rear channels.
  • Low Pass: When the Pass Mode is set to Lo, this rotary dial lets you set the cut off of the low pass filter between 50 to 500 Hz. It has a slope of 12dB/octave.
  • (In L) Mono: If you want to feed both of the front and/or rear channels with a single mono input, you can turn on the Mono operation mode by pressing in this 2-way button. The inputs should be plugged into the front and rear Left channel input.
  • Rear In: If you are connecting four channels of input to the amplifier, you should turn the Rear In switch to On. If you are connecting only two inputs, turning the Rear In switch to Off allows the amp to send the input signal to the rear channels, as well as the front. You will lose front-to-back fading capability if Rear In is turned off.
  • Bass Boost: The HCP 4 offers a selectable bass boost on the rear channel only to increase the output at 50Hz. This 3-way switch lets you select the amount of boost: 0, +6dB, or +12dB.
  • Auto Turn-On: You can activate or deactivate the ART (Automatic Remote Turn-On) feature with the 2-way push button.

Connections: The HCP 4 has the following connections:

  • Power/Ground/Remote Turn-on: The amplifier is equipped with set-screw type terminals for power, ground, and remote turn-on. The power and ground terminals will accept up to 4 AWG wire, while the remote terminal will accept up to 10 AWG wire. In most cases, 8 AWG power and ground wires are recommended. Typically, an 18 AWG remote turn-on lead is used, unless the Automatic Remote Turn-on (ART) is used. The set screws can be tightened/loosened with the supplied 4mm or 2mm Allen wrenches.
  • Fuses: Two 20A ATO (blade type) fuses are installed in the amplifier. Two spare fuses are also included. A 40A fuse should be placed within 18" of the battery on the +12V power wire as well.
  • Speaker Outputs: The amp provides set screw terminals for four speakers. The minimum impedance of the connected load is 2Ω. The set screws can be tightened/loosened with the supplied 2mm Allen wrench.
  • RCA Input: Two stereo RCA inputs are provided for connecting an aftermarket head unit to the amplifier. Mono connections for the front and rear channels can be made by plugging the RCA cables to the left channel only, and engaging the Mono Input feature (pressing in the In L (Mono) button). The inputs will accept a signal between 0.2V and 5V.
  • RCA Output: Stereo RCA outputs allow you to pass on the signal to another amplifier. The preamp output signal is full-range (or matches the input signal).
  • Speaker Input: The front and rear speaker inputs, labeled "Hi In," have 4-pin female Molex connectors. The source unit's speaker wires (L/R Front and L/R Rear) should be spliced to the Speaker Input harnesses. The included harnesses are 7" in length and have a male 4-pin Molex plug. The speaker inputs will accept a signal between 0.8V and 20V.

Additional Specifications:

  • Power Supply: 11-15 Volts DC
  • Idling Current: 1A (on); 0.04 mA (off)
  • Consumption (2Ω, 14.4V Max Musical Power): 21A
  • Remote In: 7-15 Volts DC / 1mA
  • Frequency Bandwidth: 10Hz to 45kHz
  • Distortion - THD (100Hz at 4Ω): 0.01%
  • S/N Ratio (A-weighted at 1V): 103dB
  • Damping Factor (100Hz at 4Ω): 120

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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