BMW X3 G01 Audio Upgrade | HiFi S0676 to Premium

BMW X3 G01 | HiFi S0676 Speaker System Upgrade with a DSP Amplifier

Model: BMW X3 G01 2020 with HiFi S0676 Sound System

A customer contacted us about the sound quality of their BMW X3 G01’s stereo system. They were unhappy with how the music sounded when played at loud volumes and wanted to know what improvements, if any, were possible. This is a super straightforward project for the team here at Soundtech and we were excited to take it on.

Original Setup:

The BMW’s original stereo system included:

    • Factory amplifier
    • Split component speakers with minimum output
    • Centre speaker (on the same channel as other speakers)
    • 2x underseat subwoofers with minimum output
    • Aluminium dome tweeters
BMW X3 G01 Audio Upgrade | HiFi S0676 to Premium BMW X3 G01

The customer had only recently purchased the car and hadn’t performed any upgrades, so we were working with its original factory car stereo system (Hi-Fi S0676). This is a medium-range system that comprises split component speakers in both the front and rear doors, a centre speaker and two 8-inch subwoofers under each of the front seats. The whole system is powered by a factory amplifier, which is mounted in the rear of the vehicle.

This ‘one-size-fits-all’ approach is the standard when it comes to car audio systems, even in luxury models. Whilst it seems like a good setup on paper, and is far superior to that offered by lower end vehicles, when you start listening to music at higher volumes it all starts to go downhill and it’s clear that the system doesn’t deliver good sound quality at all. Not the experience our customer was hoping for during their daily commute.

What manufacturers fail to consider is that every vehicle and every driver is different, as is the type of audio experience they want to have.

New Setup:

The new car stereo system installed by Soundtech included:

    • DSP Amplifier (UP 7DSP) – by MATCH
    • New speakers and subwoofers – by MUSWAY and STEG
    • Fully custom-tuned sound stage
    • Plug and Play adaptors and harnesses
    • Installers trained and certified by Audiotec Fischer

We began by replacing every single speaker in the BMW X3 G01 with aftermarket ones of much higher quality. We did the same with the two underseat subwoofers. These new speakers not only play music much louder than the originals, they’re also able to keep their tight bass across the whole volume range (unlike the distorted output experienced by the originals).

The new centre speaker is now powered by its own “true centre” channel and has been tuned to the rest of the system to ensure it doesn’t overpower the front stage. Each speaker and subwoofer was custom tuned using a microphone and reading device (which monitors the pink noise signal).

Every other channel – including the subwoofers – receives far more power from the very advanced digital signal processor (or DSP) amplifier, which we installed right next to the original amp (and which is how we tune the whole acoustic of the car).

For the actual tuning, we utilise a PC with complex software. It is done according to each individual car and client’s specifications. The whole tuning process can take up to 3 hours to ensure that we’re completely satisfied with the sound, a real point of difference between Soundtech and other installers.

Plus, we were able to do all of this without cutting any wires or having them visible within the vehicle.

Why Plug and Play?

Working exclusively with Plug and Play connections means that we’re not actually altering the vehicle’s original sound system – we’re just expanding on it using plugs and adaptors. Nothing is modified in a way that is permanent or that damages the car.

In the case of this upgrade, we utilised ‘High Level Output Signals’ from the factory installed amplifier that were then run through our aftermarket amplifier for further sound amplification and tuning. This new signal was then returned back to the car’s original wiring loom via high quality harnesses.

What all of this means is that the car can be restored to its factory setup at any time with 0 traces of our work left behind. Should the customer ever want to sell his BMW X3 G01 2020, he can do so without including his fancy sound system. Or if he decides that the new stereo system is not for him, the vehicle can be restored to its original setup with ease.


We were stoked to provide the customer with:

    • Great sound quality
    • More bass
    • Stealth installation
    • No voiding of the warranty
    • Fast installation

As we work closely with car manufacturers like BMW, we are able to perform stereo system installations like this one without impacting on the warranty. We also specialise in ‘stealth installations’, which means that all wiring is hidden away within the body of the vehicle (as is shown in the installation photos); no one would ever guess that the sound system did not come with the car as standard.

Upon picking up their vehicle, the customer commented that the new stereo system is far superior to the Harman Kardon one that they’d had installed in a previous BMW they owned. The great sound clarity and increased bass are testament to this.

We were able to complete the installation and tuning of the system in around 1 to 2 days time, ensuring that our customer was back out on the road in no time.

Upgrades like this one have been developed in Germany by Audiotec Fischer, one of the most advanced car audio companies in the world. The most advanced sound system for BMWs in existence, they are 100% compatible and designed to fully understand these vehicles. In this particular installation, we have utilised an amp by a brand they own, known commercially as MATCH.

The Soundtech team has been factory trained and licensed by Audiotec Fischer to install these systems, so you can rest assured that you have the very best working on your vehicle every step of the way.

If you own a BMW X3 and are unhappy with the sound quality produced by its stereo system, be sure to get in touch with us on(02) 9055 7400 or to see how we can help.

Installation Photos

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