Rear speakers ŠKODA Octavia A5: how to choose and replace correctly

Rear speakers in ŠKODA Octavia A5 - one of the key elements of the speaker system, which is often ignored until it begins to “wheeze” or stops working altogether. Owners of this model often encounter a problem: standard acoustics, even in top trim levels, are not always pleased with the sound quality. This is especially noticeable when listening to music with pronounced bass or at high volumes, when the speakers begin to “mumble” or distort the sound.

In this article we will go over everything you need to know about rear speakers. Octavia A5: from standard sizes and connection diagrams to recommendations for choosing a replacement and step-by-step installation instructions. You will learn how to avoid common mistakes when dismantling the casing, which wires are responsible for power, and why even budget speakers can sound better than standard ones - if you install them correctly. And for those who are planning to upgrade their audio system, we have prepared a comparison table of popular acoustic models indicating compatibility and installation features.

Standard Rear Speaker Sizes and Specifications Octavia A5

B ŠKODA Octavia A5 (including restyled versions 2009–2013) rear speakers are installed in the doors and have a standard size 165 mm (6.5 inches). However, there are nuances here:

• 🔹 Seat depth: about 60–65 mm. This limitation is important to consider when choosing a replacement - speakers with a magnet larger than 30-35 mm may not fit without modifying the door.
• 🔹 Fastening: 3 or 4 holes for self-tapping screws (depending on the year of manufacture). In earlier versions (before 2009), sometimes there is a non-standard arrangement of fastening points.
• 🔹 Resistance: stock speakers have impedance 4 ohm, but the head unit works without problems with 2–8 ohms.
• 🔹 Power: original speakers are designed for 20–30 W RMS, but when replacing, you can install models up to 50–60 W (provided that the radio does not clip the signal).

Important: in versions with audio system Bolero or Amundsen The rear speakers may be connected through an amplifier, which requires checking the circuit before replacing. If your car has standard “premium” acoustics (for example, with a subwoofer), then the rear speakers often have a passive filter, which can distort the sound when installing non-original speakers.

Connection diagram: how not to mix up the wires

One of the most common questions when replacing rear speakers is which wire does what?. B Octavia A5 Standard color coding is used, but it may differ depending on the configuration:

Wire color	Purpose	Notes
Brown	Weight (GND)	Usually thicker than others, connected to the body
Gray	Right speaker (+)	May be with a stripe of a different color
Gray-black	Right speaker (–)	Sometimes replaced by gray with a black dot
Green	Left speaker (+)	In some versions - purple
Green-black	Left speaker (–)	Can be completely black with a green stripe

⚠️ Attention: If your car has an audio system with an amplifier (for example, Bolero), then the wires to the rear speakers may not go directly from the radio, but through a connector in the trunk. In this case, before replacing it is necessary turn off the amplifier (usually located under the trunk parcel shelf on the right) or use a voltage tester to check the voltage.

You can use a regular battery to check polarity AA: When connected correctly, the speaker cone will extend outward. If after installation the sound becomes “flat” or the bass disappears, most likely you have mixed up + and – on one of the speakers.

Step-by-step instructions for replacing rear speakers

To replace the rear speakers in Octavia A5, you will need:

• 🔧 Screwdriver set (T20, T25, flat and cross).
• 🔨 Plastic spatulas for removing trim (or an unnecessary bank card).
• 🔌 Soldering iron or terminal connectors (if wires are cut).
• 🧲 Magnet for finding fallen screws.

⚠️ Attention: When removing the door trim do not pull it towards you - first disconnect all the clips around the perimeter. B Octavia A5 the casing is secured with 8–10 plastic latches and 2–3 self-tapping screws (under the handle and at the bottom). If you tear off the clips, they can break, and new ones are hard to find!

Unscrew the screw under the door handle (T20)

Remove the plug under the opening lever and unscrew the hidden screw

Carefully pry up the trim with a spatula at the bottom corner (starting from the back)

Disconnect the power window button wiring connector (if equipped)-->

After removing the casing, you will see the speaker mounted on a metal panel. Unscrew 3-4 screws (usually T25), disconnect the connector and remove the column. When installing a new speaker, use o-ring (included or can be cut from foam rubber) - this will prevent vibrations and improve sound insulation.

If the new speaker is deeper than stock, the door may need to be modified. For example, in some cases, owners cut out part of the metal door frame with a grinder or use spacers. However, this is risky - if you make a mistake, you can damage the window regulator or wiring.

How to choose replacement speakers: review of compatible models

When selecting rear speakers for Octavia A5 pay attention to:

1. Size: strictly 165 mm (6.5"). Speakers 160 mm or 170 mm will not fit without modification.
2. Depth: before 65 mm (including the magnet). Models with a neodymium magnet are more compact than ferrite ones.
3. Sensitivity: from 90 dB - the higher it is, the better the system will sound without an amplifier.
4. Diffuser material: paper or polypropylene give a more natural sound, aluminum or Kevlar are bright, but sometimes “metallic”.

The table below shows proven speaker models that owners Octavia A5 installed without modifications:

Model	Type	Power (RMS)	Sensitivity	Price (≈)	Features
Pioneer TS-A1670F	Coaxial	30 W	90 dB	3 500 ₽	Soft sound, good mid/high frequencies, depth 55 mm
Alpine SXE-1725S	Component	50 W	88 dB	5 200 ₽	Requires external crossover, 60mm deep
JBL GTO629	Coaxial	60 W	92 dB	4 800 ₽	Bright treble, suitable for rock music
Hertz DCX 165.3	Component	100 W	93 dB	12 000 ₽	Premium sound, requires amplifier
Morele MLK 165	Coaxial	40 W	91 dB	2 200 ₽	Budget option, depth 45 mm

If you're planning a major audio upgrade, consider component acoustics (with separate tweeters). In this case, tweeters can be installed in the upper corners of the door or on racks, and midbass speakers can be installed in standard places. However, this will require new wiring and crossover adjustments.

What to do if new speakers don't sound?

If the speakers are silent after installation, check:

1. **Polarity** - “+” and “–” may be reversed.

2. **Recorder settings** - the rear channel can be disabled in the menu (Audio → Fader).

3. **Fuse** - in the fuse box (usually F37 or F42 responsible for the audio system).

4. **Amplifier connector** - if the system has an amplifier, check its connection in the trunk.

Typical replacement mistakes and how to avoid them

Even experienced car owners sometimes make mistakes that spoil the result. Here are the most common:

• 🚫 Ignoring soundproofing. Without it, the speakers will sound “empty”, and the bass will echo loudly through the door. Minimum set: vibroplast for metal + splen for sheathing.
• 🚫 Bad soldering of wires. Twists oxidize over time, especially in humid conditions. Use heat shrink tubing or terminals.
• 🚫 Pulling screws. The speaker may become deformed, and the threads in the plastic may break. Tighten the fasteners without fanaticism.
• 🚫 Poor polarity. If you mix up “+” and “–” on one speaker, the sound stage will “disintegrate” and the bass will disappear.

Another common problem is door trim vibration at high volume. This happens due to resonance. Solution:

1. Install the speaker onto the O-ring.
2. Seal the holes in the door with vibroplast.
3. Check to see if the speaker magnet is touching any metal parts of the door.

Upgrading your audio system: when to change more than just the speakers

Replacing the rear speakers is only the first step to good sound. If you want to dramatically improve the acoustics in your Octavia A5, consider the following modifications:

• 🎵 Amplifier. Even a budget 4-channel amplifier (for example, Pioneer GM-D8604) will unlock the potential of new speakers.
• 🎵 Subwoofer. Compact active subwoofer (for example, JBL BassPro SL) will add bass without losing trunk space.
• 🎵 Soundproofing. Full treatment of doors, floor and trunk (StP-Accent + Bitoplast) will eliminate extraneous noise.
• 🎵 Sound processor. Devices like DSP (eg Audison Bit One) allow you to fine-tune the sound stage.

If your budget is limited, start with front speakers — they provide up to 70% of the sound in the cabin. The rear speakers are responsible for the “atmosphere” and filling the space, so they can be upgraded secondarily. The best option for Octavia A5:

1. Front-mounted component speakers (e.g. Focal PS 165).
2. Coaxial speakers at the rear (e.g. JBL GTO629).
3. Active subwoofer in the trunk.

⚠️ Attention: When installing the amplifier, do not connect it directly to the battery with a thin wire! Use power cable with a cross-section of at least 4 mm² and be sure to install a fuse (for example, ANL 60A) in close proximity to the battery. Otherwise, the risk of fire or electronic failure increases significantly.

Where to buy speakers: trusted stores and selection tips

When purchasing speakers for Octavia A5 It is important to avoid counterfeits and overpayments. Focus on the following proven sites:

• 🛒 Official dealers of brands (for example, Alpine, Pioneer). Plus: guarantee, minus: high price.
• 🛒 Large online stores (AutoSound, CarAudioMarket, I'll take it). There are often discounts and delivery.
• 🛒 Used market (Avito, Drome). You can find almost new speakers with a guarantee, but the risk of running into defects is higher.
• 🛒 Foreign sites (Amazon, eBay, AliExpress). Cheaper, but there may be problems with delivery and warranty.

Buying tips:

• 🔍 Check article number dynamics on the manufacturer's website - fakes often have typos in the name.
• 🔍 Ask the seller photo of packaging and dynamics (especially the magnet and basket).
• 🔍 Pay attention to country of origin. For example, Pioneer for Europe they are assembled in Malaysia, and for Asia - in China (quality may vary).
• 🔍 When buying used, check diffuser mobility - it should move freely without squeaks.

If you are not sure about your choice, contact specialized car audio workshops. Many of them provide the service "auditions" — you can come with your own music and compare the sound of different speaker models.

FAQ: Frequently asked questions about rear speakers Octavia A5

Can I install 160mm speakers instead of 165mm?

Technically yes, but some modification will be required: either widening the hole in the door, or using adapter rings. However, this can weaken the fastening and reduce sound insulation. It's better to choose speakers strictly 165 mm.

Why did noise appear (background whistling) after replacing the speakers?

This is a sign tips or bad mass. Check:

1. The quality of grounding of the speakers (the ground must be securely screwed to the body).
2. Shielding of signal wires (if they go next to power ones).
3. Radio settings (sometimes a whistle appears when the LOUD mode).

If the problem persists, try installing capacitor (for example, 10,000 µF) to power the amplifier.

How to check if the rear speakers are working without removing the trim?

Verification methods:

• 🔊 Turn on the music and adjust the balance (Fader) in the radio settings. If the sound does not change when you move the slider back, the speakers are not working.
• 🔊 Place your ear near the door trim at medium volume - vibrations should be heard.
• 🔊 Use a tester: touch the probes to the speaker contacts (the resistance should be 2–8 ohms).

Do I need to change the front speakers if I change the rear ones?

Not required, but recommended. Rear speakers in Octavia A5 are responsible for the “volume” of sound, and the front ones are responsible for detail. If you leave the stock front speakers, the soundstage will be unbalanced. The best option is to replace the front ones first, then the rear ones.

Is it possible to connect the rear speakers directly to the radio if they previously went through an amplifier?

Yes, but there are two things to consider:

1. Radio power: if it is weak (for example, 15 W per channel), the speakers will sound quiet.
2. Resistance: if speakers 2 ohm, and the radio is designed for 4 ohm, overheating is possible.

In most cases, it is enough to reconnect the wires from the radio directly to the speakers, bypassing the amplifier. But if the sound gets worse, return the circuit back.