W205 Burmester Speakers Finland, SAVE 49% - abaroadrive.com
Mercedes Lautsprecher Soundsystem Upgrade
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Koason 1920HD Android 10.25inch Screen Upgrade Autoradio Stereo Multimedia Player GPS Navigation System for MB C GLC C180 C200 C220 C250 C300 C320 C350 C63 (AMG) 2014-2018 W205 X(C)253 NTG5: Amazon.co.uk: Electronics
DSP Amplifier, Woofers + Center Speaker Upgrading for C Class W205 - MBWorld.org Forums
Just fair warning for W205 C Class buyers. DO NOT, under any circumstance, by one of these cars without the upgraded Bermeister Sound System. The standard system is embarrassingly bad, terrible, awful.
Burmester Audio Upgrade For C Class 205 (2015 on) - Braybrooks
Mercedes C300 (W205) Sound System Upgrade – Overdrive Auto Tuning