How to Choose Car Rear Door Speakers: A Complete Guide

Replacing standard acoustics with high-quality speakers in the rear doors is one of the most effective ways to improve the sound in your car. But how not to make a mistake when choosing among hundreds of models? Key problem: 80% of car owners buy speakers without taking into account the features of their car, and as a result they get either weak bass or distorted sound at high frequencies.

In this article we will analyze 5 main selection criteria (size, type, power, sensitivity and material), compare top brands (Pioneer, Alpine, JBL, Focal) and give step-by-step installation instructions. And we’ll also reveal secret of professionals: why in 90% of cases they are optimal for rear doors coaxial speakers 16 cm, and when it’s still worth buying a component system.

Choosing rear door speakers isn't just a matter of volume. It is important to consider here acoustic features of the cabin, the location of the listeners (rear passengers usually sit further from the sound source) and even the material of the door trim. For example, in cars with dense sound insulation (Toyota Camry, Volkswagen Passat) you can install speakers with less sensitivity, and in budget cars (Lada Granta, Renault Logan) priority - high efficiency.

1. Speaker size: how not to make a mistake with the diameter

The first thing you need to know is standard seat sizes in the rear doors of most cars: 10 cm (4"), 13 cm (5.25"), 16 cm (6.5") and 17 cm (6.75"). 1 cm error may cause the speaker to either not fit or to wobble, creating vibrations.

How to accurately determine the size?

• 🔍 Measure the standard column (diameter along the outer edge of the body, not along the diffuser!).
• 📏 Seat depth - a critical parameter for cars with narrow doors (Ford Focus, Hyundai Solaris).
• 🔧 Check the mounting holes: Some Chinese speakers have non-standard screw pitches.

If your car has oval speakers 6x9 inches (for example, in Chevrolet Cruze or Kia Rio), they can be replaced with round 16 cm ones, but you will need transition frame (costs 300–800 ₽). An alternative is to keep the oval ones, but choose models with a good bass response, e.g. Pioneer TS-A6990F.

⚠️ Attention: In cars Mercedes-Benz and BMW Non-standard fastenings are often used. Before purchasing, check compatibility using the VIN code on the speaker manufacturer's website.

2. Coaxial vs component: which is better for rear doors

There is no universal answer here - it all depends on sound improvement purposes:

Speaker type	Pros	Cons	Who is it suitable for?
Coaxial (2- or 3-way)	Easy installation (all in one housing) 30–50% cheaper Good for bass and mids	Worse treble processing Difficult to adjust stereo effect	Budget sound improvement, daily driving
Component (separate HF/MF/LF)	Clear sound at all frequencies Flexible customization for the salon Better for audiophiles	2–3 times more expensive Difficult installation (experience required) Requires separate crossovers	Music lovers, subwoofer preparation, premium audio

Expert opinion: For 90% of cars the optimal option is - coaxial 2-way speakers 16 cm with silk tweeter. They provide balanced sound without breaking the bank. Component systems are only justified if:

• You already have it amplifier and you are ready to spend time setting it up.
• You listen to music with a wide dynamic range (classical, jazz, lossless audio).
• The car has standard places for separate installation of high-frequency speakers (for example, in windshield pillars).

Why don't they put 3-way speakers in the rear doors?

Three-way systems (with a separate midbass) are rarely installed in the rear for two reasons:

1. Lack of space — an additional speaker requires more depth, which is problematic for compact cars.

2. Not good for rear passengers - their ears are at the level of medium/high frequencies, and they perceive low bass frequencies worse than the driver. Therefore, 2-way speakers with a good high-frequency link will give better results for the same money.

3. Power and sensitivity: what parameters are important

Two key parameters that are often confused:

• RMS power (nominal) - shows how many watts the speaker can withstand constantly without distortion. Ideal for rear doors 50–80 W RMS.
• Sensitivity (dB) - the higher, the louder the sound will be at the same power. For a car without an amplifier, take from 90 dB.

Critical mistake: focus only on peak power (MAX). For example, a speaker labeled "300 W" may have a real RMS power of only 30 W - and will burn out when connected to a stock radio.

How to choose the power for your radio?

• 🔊 Standard radio (20–30 W RMS per channel): speakers 40–60 W RMS, sensitivity 90+ dB.
• 🎛️ External amplifier (50–100 W RMS): speakers 60–100 W RMS, sensitivity 88–92 dB.
• 🚗 Premium Audio (100+ W RMS): component systems 100–150 W RMS, sensitivity 85–89 dB.

⚠️ Attention: If you connect speakers more powerful than 80 W RMS to the standard radio, necessarily use a capacitor or attenuator to avoid clipping (distortion at peak loads).

4. Materials and design: what affects the sound

Sound quality is 60% dependent on diffuser and suspension materials. Let's consider popular options:

Diffuser (cone):

• 📦 Paper/cardboard - cheap, but good for mid frequencies. Wears out quickly in high humidity.
• 🧲 Polypropylene — optimal in terms of price/quality. Resistant to moisture, good bass performance.
• 💎 Kevlar/carbon fiber - premium material for component systems. Tough, durable, but expensive.
• 🧵 Fabric (silk, fiberglass) - used in tweeters for soft sound.

Suspension (sanwich):

• 🟡 Rubber - durable, but can harden in the cold.
• 🟢 Foam/butyl rubber - softer, damps vibrations better.

Magnet:

• 🧲 Ferrite - heavy, but cheap and reliable.
• 💎 Neodymium - lighter and more compact, but more expensive. Used in premium models.

5. Top 5 brands and models for rear doors (2026)

We analyzed reviews on Drive2, Auto.ru and YouTube teststo rank the best speakers in terms of price/quality ratio:

Model	Type	RMS power	Sensitivity	Price (per pair)	Better for
Pioneer TS-A1670F	Coaxial 2-way	60 W	90 dB	5 500 ₽	Budget sound upgrade, standard radio
Alpine SXE-1725S	Coaxial 2-way	80 W	92 dB	8 000 ₽	Cars with poor sound insulation, rock/metal
JBL Club 6520	Coaxial 2-way	70 W	91 dB	7 200 ₽	Versatile, good bass
Focal Integration IS 165	Component 2-way	70 W	91 dB	18 000 ₽	Premium audio, amplifier preparation
Hertz DCX 165.3	Coaxial 3-way	100 W	93 dB	22 000 ₽	Audiophiles, cars with good sound insulation

Secret life hack: If you want to save money, buy speakers Pioneer TS-G1644R (4,000 ₽ per couple). They are worse in bass, but after installation door soundproofing (for example, StP-Accent 8 mm) the sound becomes comparable to models for 10,000 ₽.

6. Installing speakers in the rear doors: step-by-step instructions

For installation you will need:

• 🔧 Screwdriver set (phillips, flat)
• 🔨 Drill with attachments (if you need to expand the holes)
• 📏 Caliper or ruler
• 🎧 Soldering iron + solder (if there are no connectors)
• 🧴 Sealant or silicone for waterproofing

Remove the rear door trim (be careful not to break the clips)|

Disconnect the negative terminal of the battery|

Check the integrity of the standard wiring|

Prepare new speakers (modify the mounts if necessary) |

Think over the cable route (if you are installing an amplifier)

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Step 1. Dismantling the old acoustics

Remove the door trim (usually it is held in place by 4-6 clips and 1-2 screws). Carefully disconnect the power connector from the speaker. If the connector is non-standard, don't cut the wires — buy an adapter or solder new connectors.

Step 2. Preparing the seat

If the new column is larger than the old one, use adapter frame (sold in car audio stores). If necessary, widen the hole with a drill, but do not allow any cracks in the metal of the door!

Step 3. Connect and test

Connect the speaker to the wiring, observing the polarity (+ to +, – to –). Play music at medium volume and check:

• Are there any extraneous vibrations (if so, add a foam pad).
• Is the sound clear at high frequencies (hissing indicates poor contact).

Step 4. Sealing and assembly

Before final assembly, apply a thin layer of sealant around the edge of the speaker to prevent moisture ingress and improve bass performance. Reinstall the trim, making sure all the clips snap into place.

⚠️ Attention: In cars with electric windows (for example, Skoda Octavia, Volkswagen Golf) when removing the door trim be sure to turn off the powerto avoid short circuit when accidentally pressing the glass button.

7. Common mistakes and how to avoid them

Even experienced car owners make mistakes when choosing and installing speakers. Here are the top 5 mistakes and their solutions:

Mistake 1: Ignoring Polarity

If you mix up “+” and “–” when connecting, the sound will be quiet and unclear. How to check: Turn on the music and touch the diffuser with your finger - if it retracts (not pushes out), the polarity is incorrect.

Mistake 2: Saving on wires

Thin or oxidized wires choke the sound. For speakers with a power >50 W, use a cable with a cross-section from 1.5 mm² (for example, KnuKonceptz Kable).

Error 3: No soundproofing

Without it, 50% of the bass “goes” into the metal of the door. Minimum set: vibroplast (on the outside of the door) + splen (on the inside).

Error 4: Overloading the head unit

If you connect speakers 100W RMS to the radio with output 20 W, the sound will be distorted. Solution: either take speakers with sensitivity 92+ dB, or install an amplifier.

Error 5: Unaccounted for clearance

In some machines (for example, Nissan Qashqai) the speaker rests against the window lifter. Before purchasing measure the depth of the seat!

FAQ: Answers to frequently asked questions

Is it possible to install more powerful speakers in the rear doors than in the front ones?

Technically it's possible, but it's irrational. Rear passengers sit further away from the sound source, so they don't need power, but sensitivity (from 90 dB). It is better to balance the system: front speakers - 60-80 W, rear speakers - 50-70 W.

Exception: if there is a subwoofer in the back, then the rear speakers can be made less powerful (they will only reproduce mid/high frequencies).

Do I need to change wires when replacing speakers?

Required if:

• Old wires are oxidized or have damaged insulation.
• You install speakers with a power >50 W RMS (standard wiring may not withstand the load).
• The length of the wire from the radio to the speaker is >3 meters (signal loss).

For most cases, it is enough to replace the last meter of wire (from the door to the column) with copper stranded cross section 1.5–2 mm².

How to check if the column is suitable in depth?

Take a ruler and measure:

1. Seat depth from the outer door panel to the internal mechanisms.
2. The height of the speaker magnet (indicated in the specifications).
3. Add 5-10mm to shock absorbing pads.

Example: if the door depth is 60 mm and the speaker magnet is 50 mm, then it won't fit — you need to look for a model with a magnet ≤45 mm.

What should I do if a whistle appears after installing the speakers?

Whistling at high frequencies is a sign acoustic short circuit. Causes and solutions:

• The tweeter is aimed at the glass → turn it towards the passenger compartment.
• Gaps between column and door → seal them with foam rubber or sealant.
• Poor sound insulation → add a layer Bitoplasta on the inside of the door.

Is it worth installing component speakers in the rear doors if there are coaxial speakers in the front?

Only if you are ready for complex setup amplifier/processor. Otherwise, the sound stage will be “ragged”: the front speakers will provide a wide range, and the rear speakers will only provide high/mid frequencies.

The best option for most cars: front - component system, behind - coaxial speakers with good bass sound.