How to Wire Component Speakers: the best Car Audio Guide
By Robert Jones · 2026-03-09
Learn how to wire component speakers like a pro to transform your car's audio. This guide covers crossovers, tweeter placement, and top product recommendations.
Upgrading your car’s factory audio system is one of the most rewarding DIY projects a petrolhead or music lover can undertake. While "coaxial" speakers are the easy route, true audiophiles know that **component speakers** are the gold standard for soundstage and clarity. By separating the woofer from the tweeter and using a dedicated crossover, you lift the music from your footwell up to your dashboard, creating a "live" listening experience. However, many enthusiasts are intimidated by the wiring. Unlike standard speakers that simply plug and play, component sets require a bit of strategic planning. You have to find a home for the external crossover, route fresh wires through door bellows, and ensure your tweeters are mounted for optimal imaging. If you’ve been staring at a box of wires wondering where to start, you’ve come to the right place. In this guide, we will break down exactly how to wire component speakers, from understanding the signal flow to mounting your hardware. We’ll also review some of the best component sets on the UK market today to help you find the perfect match for your vehicle. ## Top Component Speaker Recommendations Before we let's look at the "how-to," let’s look at the hardware. Here are five of the best component speaker sets currently available. ### 1. Focal PS 165 FE Flax Evo Focal is the royalty of French audio, and the Flax Evo series is legendary for its natural, warm sound profile. The unique flax cone provides rigidity without the weight, resulting in incredibly precise mid-bass. * **Pros:** Exceptional mid-range clarity, high-quality crossovers included, beautiful aesthetics. * **Cons:** Premium price point; requires a powerful amplifier to truly shine. ### 2. Hertz CK 165 Cento If you want punchy, energetic sound that cuts through road noise, the Hertz Cento series is a fantastic mid-range choice. These are known for their high sensitivity, meaning they perform well even with lower-powered head units (though an amp is always better). * **Pros:** Very efficient, detailed silk dome tweeters, rugged build quality. * **Cons:** Tweeters can be slightly bright for some tastes. ### 3. JL Audio C2-650 JL Audio is synonymous with "clean." The C2-650 set offers a very balanced frequency response. It doesn't try to over-emphasise the bass, making it perfect for listeners of jazz, classical, or rock. * **Pros:** Smooth transition between woofer and tweeter, slim mounting depth. * **Cons:** Not as "loud" as some competitors; bass enthusiasts will definitely need a sub. ### 4. Alpine S-S65C S-Series For those on a tighter budget who don’t want to sacrifice quality, the Alpine S-Series is a staple. It features a carbon fibre reinforced plastic cone that handles modern pop and hip-hop with ease. * **Pros:** Very affordable, compact crossover (easy to hide in doors). * **Cons:** Tweeters are plastic-domed; slightly less refined than silk alternatives. ### 5. Morel Maximo Ultra 602 MKII Morel is a boutique brand that focuses on "musicality." The Maximo Ultra series offers a high-end sound for a mid-tier price. Their soft dome tweeters are often cited as the smoothest in their class. * **Pros:** Incredibly smooth highs, great power handling for the price. * **Cons:** Crossover housing is a bit bulky. ## Component Speaker Comparison | Model | Size | Power (RMS) | Sensitivity | Tweeter Material | |-------|------|-------------|-------------|------------------| | **Focal PS 165 FE** | 6.5" | 70W | 91.5dB | TMD (Aluminium/Mag) | | **Hertz CK 165** | 6.5" | 95W | 93dB | Tetolon (Silk) | | **JL Audio C2-650** | 6.5" | 60W | 91dB | Silk Dome | | **Alpine S-S65C** | 6.5" | 80W | 88dB | Silk Dome | | **Morel Maximo 602**| 6.5" | 90W | 90.5dB | Soft Dome | ## Step-by-Step: How to Wire Component Speakers Wiring components is all about the **Crossover**. This "brain" receives one full-range signal and splits it: sending low frequencies to the woofer and high frequencies to the tweeter. ### 1. Preparation and Routing Disconnect your car battery. Remove your door panels and identify where your factory wiring enters the door. * **The Challenge:** Most factory systems use one pair of wires for the whole door. You will need to intercept these wires to feed your new crossover. ### 2. Mounting the Crossover The crossover must stay dry. Mount it inside the door skin using industrial Velcro or screws, but ensure it doesn't interfere with the window glass moving down. * **Tip:** If your crossover is too large, you can mount it under the dashboard, but you will have to run two sets of wires into the door (one for the woofer, one for the tweeter). ### 3. Making the Connections Most crossovers have six terminals: * **IN (+/-):** Connect the wires coming from your car stereo or amplifier here. * **W F / WOOFER (+/-):** Connect these to your large 6.5" mid-bass driver. * **T W / TWEETER (+/-):** Connect these to your small tweeter. ### 4. Tweeter Placement Tweeters are directional. For the best "soundstage," try to mount them at ear level (A-pillars or the top of the door). Most sets include "flush mount" or "surface mount" cups. ### 5. Testing Before putting the door panels back on, reconnect the battery and play music at a low volume. Ensure sound is coming from both components. Check for "phase"—if the bass sounds thin, you might have swapped the (+) and (-) on one of the woofers. ## Buying Guide: What to Look For When shopping for component speakers, don't just look at the "Max Power" (which is mostly marketing); pay attention to these British-standard specs: * **RMS Power:** This is the continuous power the speaker can handle. Match this to your amplifier's output for the best results. * **Sensitivity:** If you are using a standard factory head unit, look for high sensitivity (90dB+). If you have an external amp, this is less critical. * **Crossover Adjustability:** Some crossovers have a jumper or switch (e.g., 0dB, -3dB, +3dB). This allows you to "quieten" the tweeter if it sounds too harsh in your specific car. * **Mounting Depth:** UK cars (like the VW Golf or Ford Fiesta) can have shallow doors. Check the mounting depth of the woofer to ensure it won't hit the window glass. * **Tweeter Material:** Silk/Soft domes provide a warm, smooth sound. Metal (Aluminium/Titanium) domes are much brighter and crisper—choose based on your musical preference. ## FAQ **Q: Do I need an amplifier for component speakers?** A: While not strictly required, it is highly recommended. Component speakers have complex crossovers that "soak up" power. A dedicated amp will provide the headroom needed for the speakers to sound their best without distortion. **Q: Can I use the factory wiring?** A: Yes, you can use the factory "input" wire to feed the crossover. However, you will usually need to run new, high-quality speaker wire from the crossover to the tweeter, as factory tweeters often have different wiring routes. **Q: Where should I put the crossover?** A: Inside the vehicle cabin is safest, but inside the door is most common. If mounting in the door, wrap it in a plastic bag or mount it high up to avoid water damage from rain seeping down the window seals. **Q: What is "Active" vs "Passive" wiring?** A: This guide covers "Passive" wiring (using the provided crossover box). "Active" wiring involves using a Digital Signal Processor (DSP) and a separate amp channel for every single speaker. It's much more expensive and complex. **Q: Why do my component speakers have no bass?** A: This is usually due to a "phase" issue. If one speaker is pushing while the other is pulling, they cancel each other's bass out. Check that your (+) and (-) wires are consistent on both sides of the car. ## Conclusion Wiring component speakers is a significant step up from a basic speaker swap, but the sonic rewards are undeniable. By separating the frequencies, you gain a level of detail and "air" that coaxial speakers simply cannot match. If you're looking for the best balance of price and performance, the **Hertz CK 165** is our top recommendation for the average UK listener. For those who want the absolute best and have the budget for an amplifier, the **Focal Flax Evo** remains the gold standard in car audio. Take your time with the wiring, ensure your connections are secure, and enjoy a transformed driving experience!