Hertz MPX 165.3 Review: Mille Pro Coaxial Speakers Without a Component Install
Updated: Oct 7
The Hertz MPX 165.3 is a 6.5-inch (165 mm) two-way coaxial speaker from Hertz's Mille Pro range, rated at 100 W continuous and 200 W peak into 4 Ω, with 92 dB sensitivity and a 25 mm Tetolon dome tweeter mounted in the centre of the woofer. Its Indian MRP is ₹24,990, which makes it the most expensive Hertz coaxial we list; in our Hertz range, Mille Pro sits between Cento Pro and Mille Legend. It suits owners who want a clear step up from factory door speakers without cutting holes for tweeters. Check today's price on our MPX 165.3 product page.
Quick summary
A single-hole upgrade: the tweeter sits on the woofer's axis, so there is no separate tweeter to mount.
92 dB sensitivity lets it run from a head unit, but the 100 W continuous rating is meant for an amplifier.
Grilles are not in the box, and Hertz doesn't label a mounting depth or cutout, so check fitment before you buy.
Owner feedback is short but positive, including 4.9 out of 5 from 11 eBay ratings; long-term car reports are missing.
Hertz MPX 165.3 specifications
Specification | Hertz MPX 165.3 |
|---|---|
Type | 6.5-inch (165 mm) two-way coaxial |
Power handling | 100 W continuous / 200 W peak |
Impedance | 4 Ω |
Sensitivity | 92 dB |
Frequency response | 45 Hz – 21.5 kHz |
Woofer cone | Pressed pulp with cotton fibres, Boundary Free rubber surround |
Woofer voice coil | 36 mm pure copper on a polyamide former |
Tweeter | 25 mm Tetolon dome, 20 mm voice coil, neodymium magnet |
Fs / Qts | 90 Hz / 0.88 |
Xmech | ±6 mm |
Weight | 1.27 kg per speaker |
Grilles | Not included; MPG 165.3 grille sold separately |
India MRP | ₹24,990 |
Figures come from Hertz's official MPX 165.3 page, with the 25 mm tweeter size from the Hertz Mille Pro owner's manual. The grille note is from our listing.
What Hertz put inside the MPX 165.3
The woofer has a pressed-pulp cone with cotton fibres and a Boundary Free rubber surround, which Hertz says gives a larger emitting surface and more acoustic pressure. Its 36 mm pure copper voice coil is larger than the 25 mm coils listed for the woofers in the Mille Pro component sets we stock, so this is its own woofer, not a component-set driver with a tweeter added.
The concentric Tetolon tweeter gives one emission point, which Hertz says means a natural timbre. According to Hertz, a Center Tuning Duct and a tweeter support that acts as a rear chamber keep its resonance low so it can be crossed over lower, and an acoustic lens improves off-axis response. That matters because a door speaker fires at your knees, not your ears.
Hertz quotes an Fs of 90 Hz and a Qts of 0.88, a high Qts that suits free-air mounting in a door rather than a sealed box. It doesn't publish the tweeter's crossover point or slope.
Head-unit power or an amplifier?
At 92 dB, the MPX 165.3 is efficient enough to work on an aftermarket head unit's built-in amplifier. But a head unit runs out of clean power far below the 100 W continuous rating, and once it clips, the tweeter takes the damage.
The better plan is a four-channel amplifier giving roughly 50 to 100 W RMS per channel into 4 Ω, with a high-pass filter around 80 Hz so the woofer isn't asked for deep bass. Hertz's DP 4.300 is one four-channel option we stock. Factory touchscreens rarely offer RCA pre-outs, so pick an amplifier with speaker-level inputs or a DSP that accepts the factory signal; a DSP can also time-align the doors, as our article on the need for DSP in car audio systems explains.
What owners and reviewers say about the Hertz MPX 165.3
We found no professional reviews; this is retailer feedback as it stood when we checked in October 2026.
On OnlineCarStereo, three customer reviews from 2024 are all positive. One buyer, running a 150-watt amplifier, describes clear, punchy, loud sound without distortion. Another praises the sound and build quality and feels the higher price is justified. A third, with an aftermarket amplifier in a pickup truck, was impressed by the low end and found the highs clean and the mids well blended. The page shows no star ratings or verified-buyer labels.
The eBay product page averages 4.9 out of 5 from 11 ratings, with eight short written reviews dated 2018 to 2026, all marked as verified purchases. They mention good sound, good value over stock speakers and an easy install. Two came from Harley-Davidson riders, and one is about an open-box purchase rather than the sound.
A Harley-Davidson Forums thread on the MPX 165.3 runs to at least nine pages, and DIYMobileAudio has a thread weighing it against a component set, but neither site let us read the posts, so we take no opinions from them. We found no complaints, but no long-term reports from car owners either. If you have fitted a pair, tell us how they have held up.
MPX 165.3 vs MPK 165.3 and cheaper Hertz coaxials
The natural step up is the Mille Pro component set, the MPK 165.3 (₹49,990 MRP). It adds a separate 29 mm tweeter and an outboard MPCX 2.3 crossover at 3.5 kHz with a 0/+2 dB tweeter switch, and Hertz rates it at 110 W continuous and 40 Hz – 22.5 kHz against the MPX's 100 W and 45 Hz – 21.5 kHz. The bigger gain is placement: a tweeter mounted high on the A-pillar or dash lifts the stage towards ear level. It costs about twice as much and takes more work to fit. The 3-ohm MPK 165P.3 is the same idea built to draw more from an amplifier.
Cheaper Hertz coaxials include the Cento Pro CPX 165 (₹19,990) and the Uno X 165 (₹6,490). For the same ₹24,990 as the MPX, the Cento CK 165 gets you a component set instead, if separate tweeters matter more than Mille Pro drivers.
Who should buy it, and who shouldn't
Buy the MPX 165.3 if you want a clear upgrade over factory door speakers without drilling for tweeters, you have or plan a four-channel amplifier, or you need good rear-door speakers behind a Mille Pro component front stage. It also suits a new car you'd rather not cut into.
Look elsewhere if the front doors are your only speakers and a high, centred stage matters to you; a component set does that better. If you will never add an amplifier, a cheaper coaxial leaves money for damping and fitting.
Installation notes for Indian cars
Hertz lists the MPX's dimensions only as lettered figures without a legend, so there is no clearly stated mounting depth or cutout. Openings and window-glass clearance vary and many installs need an adapter ring, so measure your door or ask us to check your car. A foam gasket between ring and door stops buzzing over rough roads.
Damp the door skin while the panel is off, since a resonant door robs the woofer of midbass; our guide to applying sound damping covers the method. Keep the factory water shield in place so monsoon water running down inside the door stays off the pulp cone. The door trim usually covers the speaker, so the missing grille rarely matters. VA3 Car Studio in Ghaziabad offers professional installation.
Price and where to buy
The MPX 165.3 has an MRP of ₹24,990. VA3 Car Studio often sells below MRP, so check the current offer on our Hertz MPX 165.3 Mille Pro listing. Every MPX we sell is a genuine Hertz product.
The bottom line
The Hertz MPX 165.3 puts a well-specified woofer and a concentric tweeter into one coaxial speaker. Owner feedback is positive but thin. Run it from a modest amplifier in damped doors and it is a tidy upgrade without a component install; if you can mount tweeters high, a component set is still the better choice.
Hertz MPX 165.3 FAQ
Does the Hertz MPX 165.3 need an amplifier?
Not to work, but it benefits from one. Its 92 dB sensitivity lets it run from a head unit, while its 100 W continuous rating is far beyond what a head unit delivers cleanly. A four-channel amplifier giving 50 to 100 W per channel lets it play louder without strain.
Are grilles included with the MPX 165.3?
No. Our listing notes that grilles are not in the box and that the matching MPG 165.3 grille is sold separately. In most cars the door trim covers the speaker, so you only need one for exposed mounting.
Will the MPX 165.3 fit my car's doors?
Hertz doesn't clearly label a mounting depth or cutout for it; its page lists lettered dimensions without a legend. Whether it fits depends on your door's opening and the window glass clearance behind it, so measure first or ask us to check your car before ordering.
Buy the Hertz MPX 165.3 Mille Pro in India
You can buy the Hertz MPX 165.3 Mille Pro online from VA3 Car Studio with pan-India shipping. See more Hertz speakers, compare other coaxial speakers, or book a speaker upgrade in Ghaziabad.
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