Hertz DT 24.3 Review: Adding Real Tweeters to Factory Door Speakers
Updated: Oct 7
The Hertz DT 24.3 is a pair of 24 mm PEI-dome tweeters with neodymium magnets, supplied with inline 3.5 kHz high-pass filters and brackets for surface or flush mounting. Hertz rates them at 94 dB sensitivity and 80 W peak through that filter, and they need only 13 mm of mounting depth. The India MRP is ₹4,990, the lowest in our Hertz speaker range, and this is the tweeter inside the Hertz DSK 165.3 and DSK 130.3 kits. It suits owners who are keeping their factory door speakers but want proper treble up high. See the pair and today's price on our Hertz DT 24.3 tweeter kit page.
Quick summary
A tweeter-only upgrade: two 24 mm PEI domes with a gentle 6 dB per octave filter at 3.5 kHz, to sit alongside existing door speakers.
94 dB sensitivity means a head unit drives them easily; the bigger risk is too much treble, not too little.
Only 13 mm deep, with surface and flush brackets, so dash corners, A-pillars and sail panels are all possible.
Owner feedback on the standalone pair is thin but positive; the DSK 165.3 and DSK 130.3 kits use the same tweeter with a steeper filter.
Hertz DT 24.3 specifications
Specification | Hertz DT 24.3 |
|---|---|
Type | 24 mm (0.9 in) dome tweeter pair with high-pass filters |
Dome and magnet | PEI dome-cone with annular acoustic lens; neodymium magnet |
Impedance | 4 Ω (Re 3.3 Ω) |
Power handling | 80 W peak with the 3.5 kHz, 6 dB/oct filter |
Sensitivity | 94 dB |
Frequency response | 3 kHz – 23 kHz |
Filter | High-pass, 3.5 kHz, 6 dB per octave (inline) |
Resonance (Fs) | 2,800 Hz |
Mounting depth | 13 mm |
Weight | 0.03 kg per tweeter |
Mounting | Surface or flush accessories and grilles included |
India MRP | ₹4,990 |
Figures come from Hertz's official DT 24.3 page, and our store listing matches them. Hertz lists a peak rating only, so treat 80 W as a short-term ceiling rather than a continuous figure.
Why add tweeters to factory speakers?
In many cars the only speakers are full-range cones low in the doors. Treble is directional, so from that position it is aimed at your shins and partly blocked by seats and legs. The result is the familiar muffled factory sound: vocals sit low and cymbals barely register. A small tweeter mounted high, near the windscreen or on the A-pillar, restores that top octave and lifts the sound up to dashboard height.
The DT 24.3 is built for that job. Its PEI dome is a plastic chosen for stiffness and heat resistance, which matters on a dashboard baking in an Indian summer. Hertz's product copy, as carried by its UK dealer, credits the annular acoustic lens in front of the dome with wide dispersion, which helps when the tweeter can't be aimed perfectly at the listener.
The 3.5 kHz filter in plain terms
The supplied filter is a first-order high-pass: it lets treble through and reduces lower frequencies gently, by 6 dB per octave below 3.5 kHz. Gentle filters are forgiving and cheap, but they leave some midrange energy reaching the tweeter. Hertz quotes the tweeter's resonance at 2,800 Hz, quite close to the filter point, so playing very loud on a powerful amplifier asks the dome to work near its resonance with little protection.
On head-unit power this is rarely a problem. If you add an amplifier later, give the tweeters their own channels and use the amplifier's high-pass as well. The Dieci Hertz DP 4.300 has high-pass filters adjustable up to 4 kHz at 12 dB per octave. A DSP goes further, with steep slopes, level trims and time alignment; our article on why DSP matters in car audio covers the basics.
Head unit or amplifier?
At 94 dB these tweeters are efficient, and the factory door speaker keeps playing full range underneath them, so the usual problem is brightness rather than a lack of level. Aim the tweeters across the car towards the opposite seat and drop the head unit's treble a step or two. A stock touchscreen head unit runs them comfortably; an amplifier earns its place once the doors are upgraded too.
What owners and reviewers say about the Hertz DT 24.3
Little has been written about the standalone pair. This is what we found when we checked in October 2026.
Four Car Audio, a UK Hertz dealer, shows two reviews, from March 2017 and June 2025, both at the top of its scale. One buyer calls the tweeters an excellent piece of kit and recommends them highly; the other rates them simply as very good. Neither says which car, mounting position or amplifier was used. At Sonic Electronix there is a single five-star rating with no written review, which tells you nothing about the sound.
More feedback exists for the kit that uses this tweeter. Four Car Audio's DSK 165.3 page carries ten reviews dated 2014 to 2026, eight at the top score, including one describing a warm sound. That covers the full component kit, not the tweeter alone. If you've fitted the DT 24.3, tell us how it went.
DT 24.3 or a full Dieci kit?
If the door speakers are also due for replacement, a kit is the tidier route. The Hertz DSK 165.3 (6.5-inch) and DSK 130.3 (5-inch) both include this tweeter, at ₹10,990 MRP each. Hertz pairs it there with a 12 dB per octave filter at the same 3.5 kHz, a steeper slope that keeps more midrange out of the dome. Buy the DT 24.3 alone when the factory woofers are acceptable. A coaxial already has its own tweeter, so if you would rather replace the whole door speaker, look at the DCX 165.3 coaxials.
At the other end of Hertz's range, the Mille Legend ML 280.3 tweeter (₹39,990 MRP) has a 35 mm dome, is rated from 1 kHz and is specified with a 1.8 kHz filter, so it can be crossed considerably lower. That is a different class of system, built around an amplifier and usually a DSP.
Who should buy it, and who shouldn't
Buy the DT 24.3 if your car has no tweeters, or very basic ones, and you want clearer vocals and more air without replacing everything. It is also a low-cost option if the budget is tight.
Look elsewhere if your door speakers are worn out or distorting; tweeters won't fix weak midrange or missing bass. If you're planning a powerful amplified system from the start, a kit with a steeper crossover, or a DSP setup, will serve you better.
Installation notes for Indian cars
Surface mounting with the angled cups works on dash corners and A-pillars, and takes the least cutting. Flush mounting suits sail panels or an existing grille with an empty space behind it; the 13 mm depth helps where there's little room. Many modern cars have curtain airbags behind the A-pillar trim, so avoid drilling or routing wires anywhere they deploy.
Each tweeter, with its inline filter in series, normally connects in parallel with the door speaker on the same channel. Keep polarity consistent, insulate the filter and secure it away from moisture inside the door. Wired this way, the head unit sees a lower load in the treble, which most units handle, but have the factory wiring checked first. VA3 Car Studio in Ghaziabad offers professional installation if you'd rather have it done for you.
Price and where to buy
The Hertz DT 24.3 has an India MRP of ₹4,990 for the pair, including the filters and mounting hardware. Check today's price and stock on our DT 24.3 product page. Every pair we sell is a genuine Hertz product, and we can advise on placement before you order.
The bottom line
The DT 24.3 does one job well: it puts real treble up high in a car whose factory speakers sit low in the doors. It is efficient, compact and cheap enough to try. The simple filter is its limit, so keep the power modest or add proper crossover help with an amplifier. For a complete upgrade, choose a DSK kit instead.
Hertz DT 24.3 FAQ
Can I add the Hertz DT 24.3 to my car's factory speakers?
Yes. That is its main use. Each tweeter connects in parallel with a factory door speaker through the supplied 3.5 kHz filter, which keeps bass out of the tweeter. Have the wiring and load checked before fitting.
Do these tweeters need an amplifier?
No. With 94 dB sensitivity they play loudly on head-unit power. If you add an amplifier later, use its high-pass filter or a DSP on top of the inline filter to protect the tweeters.
Is the DT 24.3 the same tweeter as in the Dieci DSK kits?
Yes. The DSK 165.3 and DSK 130.3 include the DT 24.3, but with a steeper 12 dB per octave filter at the same 3.5 kHz point. The standalone kit uses a gentler 6 dB per octave filter.
Buy the Hertz DT 24.3 Dieci in India
You can buy the Hertz DT 24.3 Dieci online from VA3 Car Studio with pan-India shipping. See more Hertz speakers, compare other tweeters, or book tweeter installation in Ghaziabad.
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