Hertz X 690 – 6x9" 340W 4-Way Coaxial Car Speakers 

If your factory 6x9" speakers are leaving you underwhelmed, the Hertz X 690 is the upgrade you've been looking for. This is a proper 4-way coaxial — not just a tweeter bolted onto a woofer — with a 340W peak power handling, a frequency range stretching from 45 Hz all the way to 22 kHz, and a double piezoelectric super-tweeter that most speakers at this price point simply don't have. It fits straight into your existing 6x9" slots, so the install is clean and straightforward.

What is the Hertz X 690?

The Hertz X 690 is a 6x9-inch 4-way coaxial car speaker from Hertz's Uno-Series lineup. It's designed as a direct replacement for factory 6x9" speakers and packs four separate sound-producing elements into one unit: a woofer, a 40mm PEI tweeter, and a double 15mm piezoelectric super-tweeter. Together, they cover a frequency range of 45 Hz to 22 kHz — wider than most coaxials on the market. It handles 85W RMS continuously and peaks at 340W at 4 Ohm impedance, making it compatible with both stock and aftermarket head units.

Why Choose the Hertz X 690?

• ✅ 4-way design — Dedicated drivers for bass, mids, highs, and super-highs means each frequency range is handled properly, not compromised
• ✅ Extended high-frequency response to 22 kHz — The piezoelectric super-tweeter pushes beyond what standard coaxials can reproduce, giving you a wider, more detailed stereo image
• ✅ Direct OEM fit — DIN-size basket drops into most factory 6x9" positions without cutting or modification
• ✅ Works with your stock head unit — 4 Ohm impedance and 85W RMS are well within what factory and aftermarket head units can drive
• ✅ Built for real-world use — Water-repellent cone and abrasion-resistant basket finish handle door humidity and daily wear
• ✅ Off-axis optimized — Tweeter and super-tweeter faceplate designed so every seat in the car sounds good, not just the driver's

Key Features

• 6x9" (6 × 9 inch) 4-Way Coaxial Design — Four dedicated drivers in one unit for full-spectrum sound
• 340W Peak / 85W RMS Power Handling — Plenty of headroom for dynamic music without distortion
• 4 Ohm Impedance — Standard impedance, compatible with all car audio systems
• Double 15mm Piezoelectric Super-Tweeter with PEI Dome — Extends response above 20 kHz for a wider stereo image
• 40mm PEI Tweeter with Ferrite Motor — Handles mid-high frequencies with clarity and detail
• Optimized Tweeter & Super-Tweeter Faceplate — Consistent off-axis sound for all passengers
• Water-Repellent Pressed-Paper Cone — Moisture-resistant for door-mounted use
• Foam Surround — High sensitivity combined with deep bass response
• 25mm Pure Copper Voice Coil Woofer — Handles high power cleanly without distorting
• 80mm High Flux Density Ferrite Magnet — Strong magnetic drive for accurate, powerful bass
• DIN Size Basket — Easy drop-in factory replacement, no cutting needed
• Abrasion-Resistant Dust Paint Finish — Basket protected against corrosion and wear
• Frequency Response: 45 Hz – 22 kHz — One of the widest ranges in its class
• Xmech: ±4.3 mm — Controlled cone excursion for clean bass at high volumes

Advanced Technologies

Double 15mm Piezoelectric Super-Tweeter: A piezoelectric super-tweeter uses a piezo crystal element rather than a traditional voice coil to reproduce the very highest frequencies — above 20 kHz. The X 690 uses two of these, each with a PEI dome, to push the frequency response to 22 kHz. This extends the stereo image and adds air and detail to the top end that a standard tweeter simply can't reach. It's a feature you'd normally only find in high-end component systems.

40mm PEI Tweeter with Ferrite Motor: The main tweeter handles the mid-high frequency range — vocals, guitars, cymbals — using a 40mm PEI (Polyetherimide) dome. PEI is stiff and heat-resistant, which means it moves air accurately without flexing or distorting. The ferrite motor provides a stable magnetic field to drive it cleanly. Together, this tweeter and the super-tweeter cover the entire high-frequency range in a way a single tweeter never could.

Water-Repellent Pressed-Paper Cone: The woofer cone is made from pressed paper treated with a water-repellent coating. Paper cones have excellent stiffness-to-weight ratios for audio use, and the moisture treatment protects them from the humidity that door-mounted speakers deal with every day. The result is consistent sound quality that doesn't degrade over time.

High Flux Density Ferrite Magnet (80mm): The large 80mm ferrite magnet creates a strong, stable magnetic field around the 25mm copper voice coil. More flux density means the woofer responds faster and more accurately to the audio signal — tighter bass, better transient response, and lower distortion when you push the volume.

Foam Surround: The foam surround lets the woofer cone travel freely while keeping its movement controlled. Compared to stiffer surround materials, foam gives you better sensitivity (more output from less power) and allows deeper bass extension — both at the same time. That's why the X 690 reaches down to 45 Hz.

DIN-Standard Basket with Abrasion-Resistant Finish: The basket is built to DIN dimensional standards so it fits the vast majority of factory 6x9" cutouts without any modification. The dust paint coating protects the metal basket from rust and scratches over years of use.

Benefits

• 🎵 Hear the full picture — 45 Hz to 22 kHz means deep bass, clear mids, crisp highs, and sparkling super-highs all from one speaker
• 🔊 No amp required — 85W RMS at 4 Ohm works perfectly with your existing head unit
• ⚡ Handles the loud moments — 340W peak gives you clean headroom during dynamic tracks
• 🚗 Fits without fuss — DIN basket drops into most factory 6x9" slots, no drilling or panel work needed
• 👥 Sounds good from every seat — Off-axis optimized faceplate means rear passengers get the same quality as the driver
• 🛡️ Built to last — Water-repellent cone and tough basket finish stand up to humidity, dust, and daily use
• 🎧 Wider stereo image — The piezo super-tweeter adds air and detail at the very top end that standard coaxials miss entirely

Who Should Buy the Hertz X 690?

• 6x9" speaker owners who want a serious upgrade over their factory setup without a complex install
• Car audio enthusiasts who want 4-way performance in a coaxial package
• Music lovers who listen to detailed, wide-range genres — jazz, classical, acoustic, hi-res audio
• Daily drivers who want noticeably better sound from their existing head unit
• DIY installers who want a clean, no-modification speaker swap
• Anyone with a sedan, SUV, MPV, or hatchback running factory 6x9" rear deck or door positions

Technical Specifications

Why Choose Dolphin Accessories?

• ✅ 100% Genuine Products — Sourced directly from authorised distributors. No fakes, no grey market.
• 🎧 Expert Guidance — Not sure what fits your car? Our team knows car audio and will help you get it right.
• 🚚 Pan-India Delivery — We ship reliably to every corner of India.
• 📦 Secure Packaging — Every order is packed carefully so it arrives in perfect condition.
• 🛠️ After-Sales Support — Questions after your purchase? We're here — not gone.
• ⭐ Trusted by Enthusiasts — Thousands of car audio fans across India shop with Dolphin Accessories.

Frequently Asked Questions (FAQ)

Q1: Will the Hertz X 690 work with my stock head unit?

Yes. The 4 Ohm impedance and 85W RMS rating are well within what factory head units can handle. You'll hear a clear improvement straight away without needing an amplifier.

Q2: What size are the Hertz X 690 speakers?

They're 6x9 inches and use a DIN-size basket, so they fit most factory 6x9" speaker positions in cars, SUVs, and MPVs without any cutting or modification.

Q3: What makes this a 4-way speaker?

The X 690 has four separate sound-producing elements: a woofer for bass, a 40mm PEI tweeter for mid-highs, and a double 15mm piezoelectric super-tweeter for the very top end above 20 kHz. Each handles its own frequency range, which is why the sound is more detailed and balanced than a standard 2-way coaxial.

Q4: Do I need an amplifier?

No. These run fine off a stock head unit. If you add an amplifier later, you'll unlock the full 340W peak and get even more out of them.

Q5: What is a piezoelectric super-tweeter and why does it matter?

A piezo super-tweeter uses a crystal element to reproduce frequencies above 20 kHz — beyond what a standard tweeter can reach. This adds air, detail, and width to the stereo image, especially noticeable on hi-res audio, acoustic music, and anything with a lot of high-frequency content.

Q6: What's the difference between 85W RMS and 340W peak?

RMS (85W) is the continuous power the speaker handles safely every day. Peak (340W) is the maximum it can take in short bursts during loud moments. For matching with an amplifier, always use the RMS figure.

Q7: What does off-axis performance mean?

It means the sound stays balanced even when you're not sitting directly in front of the speaker. Door and rear deck speakers are always angled away from most passengers, so this matters. The X 690's optimized faceplate ensures the back seat sounds as good as the front.

Q8: Are these speakers water-resistant?

The cone has a water-repellent treatment that handles the humidity door speakers deal with daily. They're not waterproof, but they're built to hold up in normal real-world conditions.

Q9: How hard is the installation?

Straightforward. The DIN basket fits most factory 6x9" cutouts directly — no drilling or panel modification needed in most cars. Basic tools and about 30–60 minutes per speaker.

Q10: What frequency range do the Hertz X 690 speakers cover?

45 Hz to 22,000 Hz — that's deep bass through to well above the upper limit of human hearing. It's one of the widest frequency ranges available in a coaxial speaker.

Q11: How do these compare to standard factory 6x9" speakers?

Factory 6x9" speakers are typically 2-way at best, with limited power handling and no super-tweeter. The Hertz X 690 brings 4-way design, 340W peak, a piezo super-tweeter, and a water-repellent cone — the difference in sound quality is immediately obvious.

Q12: Are they sold as a pair?

Please check the product listing or contact us at Dolphin Accessories and we'll confirm exactly what's included in your order.