An MG4 came into our Cardiff workshop with a simple problem. The owner loved the car, but he wasn’t happy with the sound. So he asked us for an MG4 audio upgrade that felt as modern as the car itself.
He didn’t want cheap. Instead, he wanted quality. That’s why we built the system around Audison, from the amplifier to the subwoofer, and soundproofed all four doors first. The factory screen stays exactly where it was.
MG has history with us, too. Back in 2023 we upgraded the sound in a retro MG, with a DAB radio and new speakers. This time the MG is electric, and the brief was bigger.
The MG4 Audio Upgrade Kit List
- Audison Forza 8-channel DSP amplifier
- Voce II component speakers in the front doors, with AV 1.0 II tweeters
- Prima APX 6.5 coaxial speakers in the rear doors
- An Audison Prima APBX 10 AS2 active 10-inch subwoofer
- Connection cables throughout
- Comfort Mat three-stage soundproofing on all four doors
- SCR Distribution speaker spacers and fitting accessories
How the MG4 Audio Upgrade Works
In short, the factory screen stays as the source. Then a DSP amplifier sits between the screen and the speakers. It takes the car’s own signal, cleans it up, and sends each speaker exactly what it should play.
The signal path, from the factory screen to every speaker.
We chose an Audison Forza because it does two jobs in one box. First, it powers the door speakers. Second, its built-in processor lets us tune every channel for this car’s cabin. You can read more about how we set these up on our DSP processor tuning page.
MG4 Audio Upgrade Step One: Soundproofing an EV
Before a single speaker went in, we soundproofed all four doors. This matters more on an electric car than most people expect. After all, there is no engine noise to cover road roar and wind noise. So every rattle and every hum from the doors is easy to hear.
Thin door panels also flex when a speaker plays. As a result, bass turns muddy and the door buzzes. Comfort Mat stops that. In fact, it is the cheapest way to make good speakers sound like great ones.
| Stage 1 | Door outer skin | Comfort Mat Aerospace Volt stops the metal ringing |
| Stage 2 | Inner skin and access holes | Seals the door so the speaker has a solid, airtight box |
| Stage 3 | Back of the door card | Stops the plastic trim buzzing and rattling |
Stage 1: the outer skin
First, we lined the inside of the door’s outer skin with Comfort Mat Aerospace Volt. This is the big flat panel you see from outside the car. Once it is damped, it stops ringing like a drum.
Stage 2: the inner skin
Next, we covered the large access holes in the inner skin. That turns the door into a sealed box for the speaker. Without it, the sound from the back of the cone cancels out the bass at the front.
Stage 3: the door cards
Finally, we treated the back of each door card. Modern trims are mostly thin plastic with lots of clips. So we covered the flat areas to stop buzzing at volume.
Audison Voce II Speakers Up Front
For the front doors we fitted Audison Voce II component speakers. The 6.5-inch woofers mount on vehicle-specific brackets, so they fit the factory locations properly. Spacers then give the woofer room to move without touching the door trim.
Voce tweeters in the factory positions
The matching AV 1.0 II tweeters sit in the factory tweeter positions behind the trim. As a result, the cabin looks completely standard. However, the sound now comes from a proper high-end tweeter instead of a basic paper one.
Prima Coaxials in the Rear Doors
In the rear doors we fitted Audison Prima APX 6.5 coaxials. Rear speakers in a car like this are mainly for fill. So a good coaxial is the right choice here, because it keeps passengers in the back part of the sound too.
A 10-Inch Active Subwoofer for Real Bass
No door speaker can play the deepest notes on its own. That’s why we added an Audison Prima APBX 10 AS2. It is a sealed 10-inch subwoofer with its own amplifier built in. Because it is compact, it sits neatly in the boot and leaves plenty of space for shopping.
Of course, the sub only sounds right when it blends with the doors. So we tuned it together with the rest of the system. See our subwoofer fitting page for more on how we choose and set up bass.
Tuning the MG4 Audio Upgrade
Once everything was fitted, we tuned the system through the Forza’s DSP. We set the crossovers so each speaker plays only what it does best. Then we adjusted levels and timing so the sound sits in front of the driver, not down in the doors.
Why Specialist Fitting Matters on a Modern EV
You could buy speakers online and swap them yourself. However, on a car like the MG4 that usually disappoints. Without soundproofing, the doors rattle. Without a DSP, even good speakers sound thin and uneven. In short, the parts are only half the job.
Our approach is simple. We keep the car looking factory, we use the right brackets and spacers, and we tune the result. That’s how you get sound that matches what you paid for.
MG4 Audio Upgrade in Cardiff & South Wales
Our workshop is at Unit C1, West Point Industrial Estate, Penarth Road, Cardiff CF11 8JQ. Customers come to us from Penarth, Barry, Newport, Bridgend and across the Vale of Glamorgan. So if your MG sounds flat, bring it in and we will show you what an MG4 audio upgrade can do.
MG4 Audio Upgrade Cardiff: Your Questions Answered
Can an MG4 audio upgrade keep the factory screen?
Yes. On this MG4 we kept the factory screen and all its features. A DSP amplifier takes the car’s own signal and sends it to the new speakers. As a result, the dash looks exactly the same, but the sound is far clearer and fuller.
Is sound deadening worth it on an electric car?
Yes. An electric car has no engine noise to cover road and wind noise, so you hear far more of it. Deadening the doors cuts that noise and stops the panels rattling. It also helps the speakers produce tighter, deeper bass.
Do I need a subwoofer in an MG4?
Not always, but it makes a big difference. Door speakers can’t play the lowest notes cleanly on their own. A compact active subwoofer, like the Audison APBX 10 AS2, fills in that bass and still leaves the boot usable.
What does a DSP amplifier do?
A DSP amplifier powers your speakers and lets us tune them. We can set which speaker plays which notes, balance the levels, and adjust timing for where you sit. So the sound comes from in front of you rather than from the doors.
Where can I get an MG4 audio upgrade near Cardiff?
We fit them at our workshop on Penarth Road, Cardiff, and customers come from across South Wales. Call 029 2070 7275 or send us a WhatsApp. Then we will talk through what you want from your MG and plan the right system.
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