BMW Harman Kardon S0688 G Gen RAM S/PDIF Interface + Front Speaker, Sub & DSP Amp Package | HELIX Ci3 / Ci5 126830

Soundtech put this s/pdif interface + front speaker, sub and dsp amp package together for the BMW Harman Kardon S0688 G Gen RAM with the Harman Kardon sound system. Every part is picked for this car, and the full parts list is below so you and your installer know exactly what turns up before any trim comes off.

What is in the package

• 1 x HELIX Ci3 K100.2FM-S3 MK2, 4" 2 way Component Speaker Set, FlexMount, 3Ω
• 1 x HELIX Ci5 S200FM-S2, 8" Subwoofer Pair, FlexMount, 2Ω
• 1 x MATCH UP 10DSP MK2, 10 Channel PnP Amplifier, 11ch DSP
• 1 x MATCH PP-BMW 1.9RAM-HK, Harness For MATCH UP 10DSP To Fit BMW Harman Kardon RAM Module (G Gen)
• 1 x HELIX FlexMount CFMK200 BMW.1S, 8" Polymer-Metal Subwoofer Adapter for BMW and Mini, Pair
• 1 x HELIX FlexMount CFMK20, 1" 3D Printed Speaker Adapter, Pair (version CFMK20 BMW.1, BMW, Mini)
• 1 x HELIX FlexMount CFMK100, 4" 3D Printed Speaker Adapter, Pair (version CFMK100 BMW.3, BMW, Mini)
• 1 x HELIX CWK BMW.FX-550C, BMW OEM Speaker to FlexMount X-over, Wire Kit, 55cm
• 1 x Extension Card 2.0 DIGITAL IN, HELIX and MATCH DSP Extension Card With Digital Input
• 1 x Eway Tech EW-BMEH-V621, Ethernet to S/PDIF Audio Interface for BMW with RAM (2020-2025)
• 2 x Premium Toslink Optical Fiber Cable S/PDIF Digital Audio 0.5m

Parts list as set up on the Soundtech package listing, checked 9 November 2026.

Fitment

Soundtech does not list model years for this package. If you are not sure your car matches, send us the VIN or build date and we will check before you order.

Which BMW sound system do I have?

Soundtech groups its BMW packages by generation and factory sound system. This one is for G generation cars with the RAM (radio amplifier module) system, which Soundtech says came in around 2019 to 2020.

Check your VIN build sheet for option code S0676 (HiFi speaker system) or S0688 (Harman Kardon surround sound). If neither code shows, it is usually the base stereo. Send us the VIN if you want us to check.

Installation and tuning

Soundtech lists its plug and play packages mainly for dealer and professional installation, although MATCH based packages can suit a confident DIY installer. The MATCH UP 10DSP MK2 is a DSP amplifier, so it needs setting up for the car once it is fitted.

Warranty

Soundtech, the Australian distributor, gives its products a standard 12 month Australian warranty. That is on top of your rights under the Australian Consumer Law.

Frequently asked questions

Will this suit my car?

It is made for the BMW Harman Kardon S0688 G Gen RAM with the Harman Kardon sound system. If you are not sure about your build or factory audio, send us the VIN and we will check.

What comes in the package?

1 x HELIX Ci3 K100.2FM-S3 MK2; 1 x HELIX Ci5 S200FM-S2; 1 x MATCH UP 10DSP MK2; 1 x MATCH PP-BMW 1.9RAM-HK; 1 x HELIX FlexMount CFMK200 BMW.1S; 1 x HELIX FlexMount CFMK20; 1 x HELIX FlexMount CFMK100; 1 x HELIX CWK BMW.FX-550C; 1 x Extension Card 2.0 DIGITAL IN; 1 x Eway Tech EW-BMEH-V621; 2 x Premium Toslink Optical Fiber Cable S/PDIF Digital Audio 0.5m. The full descriptions are in the parts list above.

How does it connect to the factory system?

The factory amplifier stays in place and the new amplifier connects through a T harness.

Does it need tuning?

Yes. The MATCH UP 10DSP MK2 is a DSP amplifier, so it should be tuned to the car after fitting.

What warranty does it have?

Soundtech gives a standard 12 month Australian warranty, on top of your rights under the Australian Consumer Law.