BMW 1 Series F20 Audio Upgrade | HiFi to Premium

BMW M135i F20 | S0676 HiFi Sound System Audio Upgrade with DSP

Model: BMW M135i 2012 with S0676 HiFi Sound System

Michael came to us with the request to upgrade his vehicle because he wasn’t happy with the stock setup at all – muddy sound and the lack of bass as we know it from most OEM systems. He had the front speakers replaced with Focals, although very precise high-end components, they were too sharp in high tones and not too pleasant to listen.

Original Setup:

The BMW’s original stereo system included:

    • BMW S0676 HiFi factory amplifier
    • 3-way splits in the front:
      • 1″ tweeter
      • 4″ midrange
      • 8″ under-seat subwoofer
    • Coaxial speakers in the back – 4″
    • Mediocre sound quality, not enough bass, low volume output
BMW M1 F20 Audio Upgrade - Basic to Premium

We use a solution that has been developed and produced in Germany by Audiotec Fischer, the world’s leading car-audio manufacturer.

New Setup:

The new car stereo system installed by Soundtech included:

    • MATCH UP 7BMW – PnP DSP amplifier
    • STEG BZ40D – rear coaxial high-end speakers
    • Audison drop-in underseat subwoofer (supplied by the customer)
    • Custom-tuned stage
    • Loudness, clarity

We installed new Audison subwoofers (client’s gear) along with some sound deadening material and the rear speakers were replaced for hand made Italian high-end coaxials STEG producing a softer warmer sound.

The heart of the whole new system – MATCH UP 7BMW DSP has replaced the OEM amplifier. This DSP from Audiotec Fischer is a super HQ piece of technology holding multiple EISA awards.

Installation done, sound tuning starts. That is also what played the most important role in the whole sound upgrade. There were significant peaks in the front speakers’ frequency response all successfully dialled down making the music far more pleasant and natural. Not as much had to be done for the STEGS at the back.

Subs were tuned to the point of no distortion across the whole volume spectrum yet playing at their maximal potential without overpowering other frequencies. We offer several more brands for the BMW under-seat subwoofers.

All parts we used have been made to fit BMW so there was no need for any modifications other than undoing a few bolts and putting them all back.

After replacing the gear and tuning the system, we spent another hour in the car sitting next to the client fine-tuning the music to his own taste.

For more, check our current package deals for BMW S0676 HiFi Speaker System Upgrade.


This setup is suitable for all BMW models with the S0676 HiFi system, all up to the year 2019. Please contact us to check the compatibility of this setup with your vehicle.


Dynamic sound, clear tones, and a great bass frequency response.

The stage has been precisely tuned up with the sound image oriented for the driver’s seat. That way it’s a much more enjoyable experience to drive the car around.

Installation time: 1 day. Please feel free to subscribe to our Youtube channel (Soundtech) for more content.

Customer Reviews & Comments

Installation Photos

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