Hertz ML 1800.3 Review: A 7-Inch Mille Legend Woofer for Active and Custom Builds
Updated: Oct 6
The Hertz ML 1800.3 is a 7-inch (180 mm) Mille Legend woofer sold on its own, without a tweeter or crossover: a neodymium motor and 50 mm voice coil, 93 dB sensitivity and a rating of 200 W continuous (400 W peak) into 4 Ω. It is a building block for a custom front stage, run either actively from a DSP or passively through a separate Hertz crossover. Its Indian MRP is ₹89,990, above the 6.5-inch ML 1650.3 at ₹69,990. It suits sound-quality builders whose doors or kick panels can take a 7-inch driver. See today's price on our ML 1800.3 product page.
Key takeaways
A bare woofer: no crossover is included, so plan an active DSP system or a separate passive network before you buy.
Against the 6.5-inch ML 1650.3 it has a bigger coil (50 mm against 36 mm), a higher rating (200 W against 125 W continuous) and a lower resonance (60 Hz against 65 Hz).
Italy's AudioReview tested it in 2015 in an article Hertz hosts, found it more controlled and freer in the bass than the ML 1650.3, and called it a true champion.
It needs 76 mm of depth and, in a door built for 6.5-inch speakers, a custom ring or baffle.
Hertz ML 1800.3 specifications
Specification | Hertz ML 1800.3 |
|---|---|
Type | 7-inch (180 mm) woofer, sold without crossover |
Impedance | 4 Ω |
Power handling | 200 W continuous / 400 W peak |
Sensitivity | 93 dB |
Frequency response | 38 Hz – 6 kHz |
Voice coil | 50 mm (2 in), two-layer CCAW on a polyamide former |
Magnet | Neodymium |
Cone | Pressed pulp with cotton fibres, V-cone profile |
Xmax / Xmech | ±4 mm / ±10 mm |
Fs / Qts / Vas | 60 Hz / 0.5 / 12.2 litres |
Mounting depth | 76 mm |
Weight | 1.71 kg |
Grille | Die-cast aluminium, included |
India MRP | ₹89,990 |
Figures come from Hertz's official ML 1800.3 tech sheet. The mounting depth is dimension D on Hertz's drawing and matches our listing.
A single driver: how it is meant to be used
Unlike a component kit, the ML 1800.3 needs something else to tell it which frequencies to play. There are two routes.
Active: a DSP splits the signal and each driver gets its own amplifier channel. AudioReview suggested crossing it to a tweeter between 1.8 and 2.5 kHz in a two-way, or to a midrange between 700 Hz and 1 kHz in a three-way; Hertz's 3-inch ML 700.3 is the matching Legend midrange. An active three-way with the ML 280.3 tweeter needs six channels for the front stage, which JL Audio's VX800/8i, an eight-channel amplifier with built-in DSP, can supply.
Passive: Hertz designed its MLCX 2 TW.3 crossover to build a two-way from the ML 1800.3 and the ML 280.3 tweeter, with switches to adapt it to the car. We do not list that crossover separately online, so ask us about options. Our guide to why DSP matters in car audio explains what the active route adds.
What the extra inch buys
The ML 1800.3 shares its basic recipe with the 6.5-inch ML 1650.3: an FEA-optimised neodymium magnet, an aluminium-covered pole, a pressed-pulp V-cone with cotton fibres, a Boundary Free butyl surround and a vented three-spoke aluminium basket. The differences are in size and motor. Its effective cone diameter is 149 mm against 132 mm, about 27 per cent more cone area, but its linear excursion is ±4 mm against ±5 mm, so on paper the two move a similar volume of air within their linear limits.
Where the 7-inch pulls ahead is the motor: a 50 mm coil instead of 36 mm, a 200 W continuous rating instead of 125 W, and a 60 Hz resonance instead of 65 Hz. That points to a driver built to take more power cleanly and start a little lower.
What owners and reviewers say about the Hertz ML 1800.3
When we checked in October 2026, OnlineCarStereo showed no customer reviews, and Crutchfield's review page would not load for us. The main assessment is a magazine test.
AudioReview tested the ML 1800.3 in September 2015; Hertz hosts the article, so treat it as a favourable selection. Its lab measured 58 Hz resonance, a Qts of 0.49 and 14.5 litres Vas, with an impedance minimum of 3.7 Ω at 250 Hz and distortion it called decidedly contained. Output passed 103 dB at 80 Hz, and above 250 Hz the woofer took the test amplifier's full power at about 117 dB. In listening, the reviewer heard tighter control than from the ML 1650.3, freer bass and a very natural blend through the crossover, likening it to a wiser, more capable older brother that reaches excellent results with naturalness. The catch was fitting: an 18 cm woofer in a mounting made for a 16.5 cm speaker needed adapter work.
A 2018 RamForum thread on fitting it in truck doors had no owners, but one member argued that with 93 dB sensitivity and 4 mm Xmax it is closer to a midrange-leaning woofer than a dedicated mid-bass driver. If you run a pair, we would like to hear how they perform.
Hertz ML 1800.3 vs ML 1650.3 and MLK 1650.3
The ML 1650.3 (₹69,990 MRP) is the 6.5-inch alternative. It needs less depth (69 mm against 76 mm) and fits standard openings more easily, but it is rated lower and uses the smaller coil. The MLK 1650.3 kit (₹1,09,990 MRP) packages the ML 1650.3 with ML 280.3 tweeters and the MLCX 2 TW.3 crossover; because Hertz designed that crossover to accept the ML 1800.3 too, the 7-inch is a natural upgrade path for the same tweeter.
Who should buy it, and who shouldn't
Buy the ML 1800.3 if you are planning an active two-way or three-way with a DSP, your doors or kick panels can take a 7-inch driver, and you want the extra power handling over the ML 1650.3.
Look elsewhere if you want a ready-made kit with crossovers in the box, your doors are tight on depth, or you want heavy mid-bass from the doors alone; its 4 mm Xmax suggests pairing it with a subwoofer.
Installation notes for Indian cars
If your door was designed for a 6.5-inch speaker, as the mounting in AudioReview's test car was, expect a custom ring or baffle, and check that the window glass clears the 76 mm depth. A rigid, sealed and damped door is essential; our sound damping guide explains how. Use rings made from moisture-resistant material, since doors take in water during the monsoon.
Plan the DSP and amplifier location, wiring and tuning before any panel comes off. VA3 Car Studio in Ghaziabad offers professional installation.
Price and where to buy
The Hertz ML 1800.3 carries an MRP of ₹89,990. VA3 Car Studio often sells below MRP, so check the current offer on the ML 1800.3 product page. The listing includes the die-cast grilles; tweeters, crossovers and amplification are separate. Every unit we sell is a genuine Hertz product.
The bottom line
The ML 1800.3 is a woofer for people building a system rather than buying one. It brings a bigger coil, more power handling and a lower resonance than the 6.5-inch Legend woofer, and the one magazine test we found, which Hertz hosts, rates it highly. It asks for a DSP or a separate crossover, a door that can take a 7-inch driver, and a subwoofer for the deepest bass.
Hertz ML 1800.3 FAQ
Does the Hertz ML 1800.3 come with a crossover?
No. It is sold as a woofer with grilles only. Run it actively from a DSP with its own amplifier channel, or passively through a crossover such as Hertz's MLCX 2 TW.3, which is designed to pair it with the ML 280.3 tweeter.
Will the ML 1800.3 fit a 6.5-inch door opening?
Usually not directly. It is a 180 mm driver needing 76 mm of depth, and AudioReview needed adapter work to fit it in a mounting designed for a 16.5 cm speaker. Plan on a custom ring or baffle.
What crossover frequency suits the ML 1800.3?
Hertz rates it from 38 Hz to 6 kHz. AudioReview suggested 1.8 to 2.5 kHz when crossing to a tweeter in a two-way system, and 700 Hz to 1 kHz when crossing to a midrange in a three-way.
Buy Hertz Speakers in India
Check the Hertz ML 1800.3 Mille Legend 7 Inch Component Woofer price in India, browse more Hertz speakers or compare all midrange and midbass speakers in India. Want it fitted properly? Book a speaker upgrade at our Ghaziabad studio.
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