Hertz DP 4.300 Review: Hi-Res Class AB Four-Channel Amp for Speakers
Updated: Oct 6
The Hertz DP 4.300 is a four-channel Class AB amplifier from Hertz's Dieci Power range, rated at 60 W x 4 into 4 ohms and 85 W x 4 into 2 ohms, or 170 W x 2 bridged, all at 14.4 V and 1% distortion. It carries Hi-Res Audio certification with a 10 Hz to 45 kHz response, and its speaker-level inputs and automatic turn-on make it easy to add to a factory head unit. In India its MRP is ₹20,990, the lowest of the three Dieci Power amplifiers we sell. It suits a front-and-rear speaker upgrade, or front speakers plus a modest subwoofer from one amplifier. Find it on our Hertz DP 4.300 product page.
Quick summary
Class AB, Hi-Res certified, 60 W x 4 at 4 ohms; the 840 W in our listing title is Hertz's total-power figure, not a per-channel rating.
Stable at 2 ohms per channel and bridgeable to 4 ohms, so it can run four speakers, two bridged channels, or three channels with a sub.
Speaker-level inputs, automatic turn-on from factory speaker wires and full-range pre-outs.
We found no owner reviews or professional tests, so this post relies on Hertz's published data.
Hertz DP 4.300 specifications
Specification | Hertz DP 4.300 |
|---|---|
Type | 4-channel Class AB, Hi-Res Audio certified |
Power, 14.4 V, 1% THD | 60 W x 4 at 4 Ω; 85 W x 4 at 2 Ω; 170 W x 2 bridged at 4 Ω |
Three-channel mode | 60 W x 2 at 4 Ω plus 170 W x 1 bridged at 4 Ω |
Power, 14.4 V, 10% THD | 75 W x 4 at 4 Ω; 105 W x 4 at 2 Ω; 210 W x 2 bridged |
Minimum load | 2 Ω per channel; 4 Ω bridged |
Frequency response | 10 Hz – 45 kHz |
Crossovers | High-pass and low-pass, front and rear: Full or 50–4000 Hz, 12 dB/octave |
Bass boost | 0–9 dB |
Inputs | Pre-in 0.32–8 V RMS; speaker-in 1.6–40 V RMS |
THD / S/N / damping factor | 0.015% / 100 dBA / 105 |
Efficiency | 59% |
Supply / fuses | 11–15 V DC / 2 x 20 A |
Size / weight | 290 x 190 x 50 mm / 2.43 kg |
India MRP | ₹20,990 |
Figures are from Hertz's DP 4.300 page and our listing.
Power, and why Class AB
Read the 1% figures: 60 W per channel into 4 ohms suits many aftermarket 6.5-inch speakers. The 840 W total that Hertz publishes, and our listing repeats, is exactly double the 4 x 105 W it quotes at 2 ohms and 10% distortion. It isn't a useful number for matching speakers.
Class AB is the traditional choice for speaker amplifiers, and Hertz backs it with a Hi-Res Audio certification, a 0.015% distortion figure and a 100 dBA signal-to-noise ratio. The trade-off is efficiency. Hertz rates the DP 4.300 at 59%, against 86% for its Class D DP 1.500, so more of the power it draws becomes heat. That shapes where you mount it.
Factory head units, inputs and crossovers
For a car keeping its factory touchscreen, the speaker-level input accepts 1.6 to 40 V and the amplifier can switch itself on and off from the factory speaker outputs, so no remote wire is needed. Hertz says the inputs are balanced for noise rejection and that its Universal Speaker Simulator lets it connect correctly to head units with speaker-load detection. With an aftermarket head unit, the RCA input takes 0.32 to 8 V, and full-range front pre-outs can feed a second amplifier.
Front and rear channel pairs each get high-pass and low-pass filters from 50 Hz to 4 kHz at 12 dB per octave, plus up to 9 dB of bass boost. Set the high-pass around 80 Hz for door speakers if you add a subwoofer; it protects small woofers from deep bass they can't play. For time alignment and proper tuning, a DSP is the next step, and our guide on why a DSP helps explains it.
Matching speakers and subwoofers
Hertz's Uno K 165 component set (75 W continuous, 93.5 dB) and the Dieci DSK 165.3 (80 W continuous, 93 dB) are sensible partners at 60 W a channel. Bigger sets rated around 100 W continuous will work but leave headroom unused; the DP 4.400 suits them better.
In three-channel mode, one bridged channel gives 170 W into a 4-ohm sub such as Hertz's 12-inch Dieci DS 30.3, while the other two channels still drive your door speakers; check Hertz's manual for which pair to bridge. A bridged channel needs at least 4 ohms, so 2-ohm subs such as the MPBX 300 S2 need a mono amplifier instead.
What owners and reviewers say about the Hertz DP 4.300
When we checked in October 2026, we found no owner reviews and no professional test of the DP 4.300, including on Four Car Audio's page for it. We won't guess at a verdict.
What can be checked is Hertz's published data above. The mono DP 1.500 from the same range does have some owner feedback, covered in our DP 1.500 review, but it is a different amplifier and tells you little about this one. If you own a DP 4.300, please tell us how it performs.
DP 4.300 vs DP 4.400 and DP 1.500
The DP 4.400 costs ₹10,000 more at ₹30,990 MRP. It raises output to 75 W x 4 at 4 ohms, 105 W x 4 at 2 ohms and 210 W x 2 bridged, and Hertz quotes lower distortion (0.01%) and a higher damping factor (130 against 105). It is also larger at 335 mm long and 2.88 kg, and uses 2 x 25 A fuses. Choose it for speakers rated near 100 W continuous, or to give a bridged sub more power.
The DP 1.500 (₹24,990 MRP) is the subwoofer specialist: 500 W into 2 ohms. A common layout pairs it with a DP 4.300 for the speakers.
Who should buy it, and who shouldn't
Buy the DP 4.300 if you want clean power for front and rear speakers rated around 60 to 80 W, need factory head-unit compatibility, or want front speakers plus a modest 4-ohm sub from one amplifier.
Look elsewhere if your speakers are rated near 100 W continuous or more (the DP 4.400), you want serious bass from a 2-ohm sub (the DP 1.500), or space and heat are critical, where a Class D design would run cooler.
Installation notes for Indian cars
Heat is the main consideration. A Class AB amplifier in a closed boot in May needs airflow, so mount it on a panel or under a seat with clear space around it, never under carpet or luggage. Hertz rates it for -20 to 60 °C, and the 290 x 190 mm footprint needs a flat, well-ventilated spot.
Hertz gives its consumption at 14.4 V into 2 ohms as 24 A at maximum musical power, so don't treat that as a ceiling. It idles at 0.8 A and uses two 20 A fuses, so run a correctly sized, fused power cable and a solid earth. Hertz says it operates from 6.5 to 16.5 V, which should help when voltage dips at idle with the AC running. Our guide on why you need an amplifier covers the basics, and VA3 Car Studio in Ghaziabad can install and set it up for you.
Price and where to buy
The Hertz DP 4.300 has an MRP of ₹20,990 in our current Indian listing. Check today's price on the DP 4.300 product page, and ask us which speakers suit it. Every amplifier we sell is a genuine Hertz product.
The bottom line
The DP 4.300 is a straightforward, well-specified Class AB four-channel: Hi-Res certified, 2-ohm stable, bridgeable and ready for factory head units. It should run warmer than the Class D DP 1.500 and we found no owner reviews, so mount it carefully and judge it on Hertz's published figures. For speakers rated around 60 to 80 W, it is a sensible match at its price.
Hertz DP 4.300 FAQ
Can the Hertz DP 4.300 run a subwoofer?
Yes. In three-channel mode one bridged channel delivers 170 W into a 4-ohm subwoofer while the other two give 60 W each into 4 ohms. It can't drive a 2-ohm sub in bridged mode.
Does the DP 4.300 work with a factory head unit?
Yes. Its speaker-level input accepts 1.6 to 40 V and it can turn itself on and off automatically from the factory speaker outputs, so it doesn't need RCA outputs or a remote wire.
What does the 840 W figure mean?
It is the total power figure Hertz publishes, and it is exactly double the 4 x 105 W quoted at 2 ohms and 10% distortion. For matching speakers, use the 1% ratings: 60 W x 4 at 4 ohms or 85 W x 4 at 2 ohms.
Buy Hertz Amplifiers in India
Check the Hertz DP 4.300 4-Channel Class AB Car Amplifier 840W price in India, browse more Hertz amplifiers or compare all multi-channel amplifiers in India. Want it fitted properly? Book amplifier installation at our Ghaziabad studio.
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