Hertz DP 4.300 Dieci Power 4-Channel Class AB Amplifier 420W

Hertz DP 4.300 Dieci Power 4-Channel Class AB Car Amplifier 420W

A fully bridgeable 4-channel Class AB car amplifier from the Hertz Dieci Power range, the DP 4.300 delivers 420W total power across 4, 3, or 2 channel configurations with 2Ω stability, Hi-Res Audio certification at 10Hz-45kHz, Speaker-In and Pre-In inputs with Universal Speaker Simulator (USS) technology, adjustable high/low-pass crossovers, bass boost, balanced input circuitry, and automatic remote turn-on from OEM speaker outputs.

Product Overview

The Hertz DP 4.300 is a compact fully bridgeable 4-channel Class AB amplifier from the Dieci Power Series, designed to deliver maximum power output in a minimal footprint suited to modern vehicle installations including factory amplifier locations. The amplifier operates in 4-channel, 3-channel, and 2-channel configurations, with output power ranging from 60W x 4 at 4Ω to 85W x 4 at 2Ω in 4-channel mode, 60W x 2 + 170W x 1 in 3-channel mode, and 170W x 2 in 2-channel bridged mode at 1% THD and 14.4V. Maximum musical power is 420W total.

Hi-Res Audio certification with a 10Hz-45kHz bandwidth at -3dB ensures faithful reproduction of high-resolution audio sources. Speaker-In inputs with 1.6-40Vrms sensitivity and integrated Universal Speaker Simulator (USS) technology enable correct connection to head units with speaker load detection, including OEM and factory head units. Pre-In inputs cover 0.32-8Vrms. Balanced input circuitry on both Pre-In and Speaker-In provides high noise rejection for clean signal transmission. Automatic Remote Turn-On/Off is triggered by OEM radio speaker output at 1.5V DC.

Full set of controls includes adjustable input levels, front and rear high/low-pass crossover filters (50-4000Hz, 12dB/Oct.), and 0-9dB bass boost at 50Hz. Full-range pre-outs are provided from the front channel. Operating supply voltage range is 6.5-16.5V DC with a nominal 2 x 20A fuse rating. Elegant status LED, solid machined terminal block, and removable top panel. Dimensions are 290 x 252 x 50mm. Weight 2.43kg.

Features & Benefits

Hi-Res Audio Certification - 10Hz to 45kHz Bandwidth: The DP 4.300 holds Hi-Res Audio certification with a frequency response of 10Hz to 45kHz at -3dB, ensuring faithful reproduction of high-resolution audio sources well beyond the standard 20kHz upper limit of CD-quality audio.

Fully Bridgeable 4-Channel Class AB - 2Ω Stable: The fully bridgeable 4-channel Class AB topology delivers clean, efficient power across 4, 3, and 2 channel configurations with 2Ω stability, providing flexibility for a wide range of speaker and subwoofer system configurations.

420W Total Maximum Musical Power: The DP 4.300 delivers up to 420W total maximum musical power across its output configurations, providing ample headroom for dynamic musical passages.

Universal Speaker Simulator (USS) Technology: The integrated USS technology enables the DP 4.300 to be correctly connected to head units with speaker load detection, including OEM factory head units that require a low-impedance load on the speaker outputs to enable the audio outputs - a common requirement in modern factory audio system integration.

Speaker-In with Balanced Input Circuitry - 1.6 to 40Vrms: The Speaker-In input accepts 1.6-40Vrms with balanced input circuitry for high noise rejection, enabling direct connection from OEM factory head unit speaker outputs with clean signal transfer across a wide range of factory output levels.

Automatic Remote Turn-On/Off from OEM Speaker Output: The ART (Automatic Remote Turn-On/Off) feature activates the amplifier automatically from the OEM radio speaker output signal at 1.5V DC, eliminating the need for a dedicated remote wire from the factory head unit - particularly useful in factory integration installations where a remote output may not be available.

Adjustable High/Low-Pass Crossovers - 50-4000Hz 12dB/Oct.: Independent adjustable high and low-pass crossover filters on both front and rear channels (50-4000Hz, 12dB/Oct.) provide extensive flexibility for configuring the amplifier to drive tweeters, midrange speakers, and subwoofers within the same unit.

0-9dB Bass Boost at 50Hz: The adjustable bass boost provides up to 9dB of gain at 50Hz for additional bass emphasis when driving subwoofer loads in bridged configuration.

Full-Range Pre-Outs: Full-range front channel pre-outs are available regardless of whether Pre-In or Speaker-In inputs are in use, enabling connection of additional downstream amplifiers or signal processors.

Compact Design for Modern Vehicle Installations: The ultra-compact 290 x 252 x 50mm form factor is engineered for installation in the increasingly narrow spaces of modern vehicles, including factory amplifier locations beneath seats and within door panels.

Elegant Design with Removable Top Panel: The machined terminal block, status LED, and removable top panel that protects controls and connections provide a premium appearance and functional protection for the amplifier's inputs, outputs, and controls.

Technical Specs

Compatible With

The DP 4.300 is compatible with 6.5-16.5V DC vehicle electrical systems. Speaker-In inputs with USS technology and ART automatic turn-on enable direct integration with OEM factory head units. Pre-In inputs support aftermarket head units and signal processors. Full-range front channel pre-outs allow connection of additional downstream amplifiers. Confirm speaker impedance loads match the supported minimum impedance (2Ω for 4-channel, 4Ω for 2-channel bridged) before purchase.

Frequently Asked Questions

What is USS (Universal Speaker Simulator) technology and why is it important?

USS is Hertz's Universal Speaker Simulator technology that presents the correct low-impedance load to OEM factory head units with speaker load detection circuitry. Many modern factory head units monitor the presence of a speaker load on their outputs and will only enable audio output if a low-impedance load is detected. Without USS, connecting a high-impedance amplifier input directly to the factory head unit speaker output can cause the head unit to mute or error. USS resolves this, enabling clean OEM integration without additional adapters.

Does the DP 4.300 require a separate remote wire for turn-on?

Not necessarily. The ART (Automatic Remote Turn-On/Off) feature activates the amplifier from the OEM radio speaker output signal at 1.5V DC, eliminating the need for a dedicated remote wire in factory head unit integration installations. A conventional remote wire connection can still be used when installing with an aftermarket head unit.

What is the DP 4.300 rated at in bridged 2-channel mode?

In 2-channel bridged mode at 4Ω, the DP 4.300 is rated at 170W x 2 at 1% THD, or 210W x 2 at 10% THD and 14.4V DC.

Is the DP 4.300 Hi-Res Audio certified?

Yes. The DP 4.300 holds Hi-Res Audio certification with a frequency response of 10Hz to 45kHz at -3dB, confirming suitability for high-resolution audio source reproduction.

Can the DP 4.300 drive a subwoofer?

Yes. In 3-channel mode, the DP 4.300 delivers 170W x 1 into a 4Ω load on the bridged rear channel, suitable for driving a single subwoofer alongside two front channel speakers. In 2-channel bridged mode it delivers 170W x 2 into 4Ω for a stereo subwoofer or two dedicated subwoofer loads.