Hertz MP 70.3 Review: The Mille Pro 3-Inch Midrange for Active Three-Way Builds
Updated: Oct 6
The Hertz MP 70.3 is a 70 mm (3-inch) midrange driver from Hertz's Mille Pro range, built around a symmetrical dual neodymium magnet inside its 20 mm voice coil. Hertz rates it at 100 W peak with a 250 Hz high-pass filter, 88 dB sensitivity and a 180 Hz – 18 kHz response, and it is the same midrange used in the MPK 163.3 three-way kit. Its Indian MRP is ₹29,990, below the Mille Legend ML 700.3 midrange. It suits owners turning a two-way front stage into a three-way with a DSP, building a custom three-way, or adding a centre channel. Prices are on our MP 70.3 product page.
Quick summary
A driver, not a system: no crossover comes with it, so you need a DSP or a passive network to high-pass it.
Hertz's 100 W peak rating assumes a high-pass of at least 250 Hz at 12 dB/octave, and no continuous rating is published.
At 88 dB it is less sensitive than the Mille Pro woofers (93 to 94 dB), so plan the gain structure around it.
Owner feedback is limited to two short, moderated retailer reviews describing a warm, clear sound.
Hertz MP 70.3 specifications
Specification | Hertz MP 70.3 |
|---|---|
Type | 70 mm (3-inch) midrange |
Impedance | 4 Ω |
Power handling | 100 W peak (high-pass at 250 Hz, 12 dB/octave) |
Sensitivity | 88 dB |
Frequency response | 180 Hz – 18 kHz |
Voice coil | 20 mm CCAW, double layer, polyamide former |
Magnet | Neodymium, symmetrical dual structure |
Cone | V-cone pressed pulp with cotton fibres, Boundary Free surround |
Xmax | 1.5 mm |
Fs / Qts / Vas | 110 Hz / 0.82 / 1 l |
Weight | 0.17 kg |
Grilles | Included (metal mesh) |
India MRP | ₹29,990 |
Figures are from Hertz's MP 70.3 page; the impedance and the high-pass condition are from the Hertz Mille Pro owner's manual. The product page prints 2 ohms, but its own 3.7-ohm Re rules that out, and the manual and our listing both say 4 ohms.
How Hertz built it
Most of the engineering sits in the motor. Hertz developed the symmetrical dual neodymium magnet with FEM simulation for dynamics and control, and winds the 20 mm copper-clad aluminium coil in two layers on a polyamide former with eight decompression holes, which it says improves power handling and avoids compression. The cone is Hertz's exponential V-cone in pressed pulp with cotton fibres, and the Boundary Free rubber surround is meant to extend the driver further down into the midbass.
Two practical touches stand out. The anti-vibration rubber cover on the magnet can be removed where mounting depth is tight, and the metal mesh grille, with a mineral-powder-coated inner layer, protects the cone in an exposed pod. The basket is diamond-cut aluminium alloy.
What you need to add: crossover and power
The MP 70.3 must never see full-range bass. Hertz's own rating assumes a high-pass of at least 250 Hz at 12 dB/octave, and in the MPK 163.3 kit the MPCX 3.3 crossover runs it from 450 Hz to 5.5 kHz. With an Fs of 110 Hz and only 1.5 mm of Xmax, the higher you cross it, the more headroom it has.
The cleanest way to add it to an existing two-way is active: a DSP amplifier with a spare pair of channels, the midrange band-passed between the woofer and tweeter, and the woofer and tweeter levels trimmed to match the midrange's 88 dB. Around 50 W RMS per channel is plenty given the 100 W peak rating. Our guide to setting up a DSP in your car covers crossover points and time alignment, and this piece on why DSPs matter explains the case for one.
What owners and reviewers say about the Hertz MP 70.3
Feedback on this driver on its own is scarce, and we found no professional review. Here is what we found when we checked in October 2026.
OnlineCarStereo has two short reviews from 2024. One owner fitted the midranges in custom A-pillar pods with tweeters and describes a warm, natural sound for vocals and instruments; they used a second set as a centre channel and found it improved the centre image. The other, posted under the same reviewer name, describes a clear, warm sound. The site says it moderates reviews and does not publish negative comments it cannot verify, so read these as a favourable sample.
The eBay page for the MPK 163.3 kit, which includes this midrange, averages 5.0 out of 5 from 4 ratings, but those reviews cover the whole three-way set, not the MP 70.3 alone. A US retailer, ABT, lists the driver as a pair. If you run the MP 70.3 in your car, we would like to hear about it.
MP 70.3 vs ML 700.3 and the MPK 163.3 kit
The Mille Legend ML 700.3 (₹49,990) is the step up: also 70 mm, 4 ohms and 100 W peak, with 90 dB sensitivity and a response listed to 20 kHz, and a die-cast aluminium grille. The MP 70.3 reaches lower on paper (180 Hz against 200 Hz) and lists more Xmax (1.5 mm against 1.1 mm); both quote an Fs of 110 Hz. On paper, the ₹20,000 difference buys sensitivity and top-end extension rather than bass reach.
If you are starting from scratch, compare the full MPK 163.3 kit (₹69,990), which adds MP 165.3 woofers, MP 25.3 tweeters and the passive MPCX 3.3 crossovers. Adding the MP 70.3 to a two-way MPK 165.3 (₹49,990) costs more than the kit and still leaves you needing a DSP or a separate three-way crossover.
Who should buy it, and who shouldn't
Buy the MP 70.3 if you already run Mille Pro woofers and tweeters actively, or plan to, and want a dedicated midrange; you are building a custom three-way with a DSP; or you want a matched centre-channel speaker for a DSP-based front stage.
Look elsewhere if you want a plug-in upgrade without a DSP. A passive three-way like the MPK 163.3 is simpler, and a two-way such as the MPK 165.3 asks far less of the installation.
Installation notes for Indian cars
A 3-inch midrange belongs high, usually in A-pillar pods or dash corners close to the tweeter, aimed across the cabin; our article on aluminium pods for three-way systems shows the approach. Hertz lists the dimensions only as lettered figures without a legend, so measure the space or ask us to check. Removing the rubber magnet cover helps where depth is tight.
Give the driver a sealed, rigid enclosure behind it rather than an open cavity, and make sure pods are firmly fixed, as rattles show up quickly on broken roads. Many A-pillars hide curtain airbags, so leave pillar trims and wiring there to a professional. VA3 Car Studio in Ghaziabad offers professional installation.
Price and where to buy
The MP 70.3 has an MRP of ₹29,990. Our listing's box contents name midrange drivers, in the plural, with grilles; ask us if you want to confirm what the price covers. VA3 Car Studio often sells below MRP, so check the current offer on our Hertz MP 70.3 listing.
The bottom line
The Hertz MP 70.3 is a well-engineered 3-inch midrange with a dual neodymium motor, a removable magnet cover for shallow spaces and a protective grille. It needs a DSP or crossover, a sensible high-pass and careful placement, and owner feedback is thin. For an active three-way built on Mille Pro drivers, it is the natural fit.
Hertz MP 70.3 FAQ
Does the Hertz MP 70.3 need a crossover?
Yes. It comes without one, and Hertz's power rating assumes a high-pass of at least 250 Hz at 12 dB/octave. Use a DSP or a passive network; the MPK 163.3 kit runs it from 450 Hz to 5.5 kHz.
Is the MP 70.3 a 4-ohm or 2-ohm midrange?
It is 4 ohms. Hertz's product page prints 2 ohms, but the same page gives a 3.7-ohm Re, which a 2-ohm driver cannot have, and Hertz's owner's manual and our listing both say 4 ohms.
Can I add the MP 70.3 to a two-way component set?
Yes, but a two-way passive crossover has no midrange output, so you need a DSP amplifier or a separate three-way crossover. Running everything actively through a DSP gives the most control over levels and crossover points.
Buy Hertz Speakers in India
You can buy the Hertz MP 70.3 Mille Pro 3 Inch Component Midrange online from VA3 Car Studio with pan-India shipping. See more Hertz speakers, compare other midrange and midbass speakers, or book a speaker upgrade in Ghaziabad.
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