Stage 4 - BMW Base Audio Only - Coax Speakers, Subs and DSP Amplifier Upgrade Package

Stage 4 BMW Base Audio Upgrade Package with MUSWAY M6v4-512K DSP Amplifier

The Stage 4 package is built for BMW Base Audio systems where you want a complete plug-and-play upgrade with stronger front speaker output, improved underseat bass and proper DSP amplifier control.

This package replaces the original front door speakers and underseat woofers, then adds the current MUSWAY M6v4-512K 6-channel DSP amplifier with BMW-specific plug-and-play wiring selected for your vehicle.

What is included?

• Musway CSB4.2X coaxial speakers for the front door locations
• Musway CSB8W 2-ohm underseat woofers
• MUSWAY M6v4-512K 6-channel Class D DSP amplifier
• Vehicle-specific BMW plug-and-play wiring matched to the selected audio system option
• DSP setup support available if required

About the M6v4-512K DSP amplifier

The MUSWAY M6v4-512K combines six amplifier channels with eight-channel DSP processing. It supports high-level input with autosense, EPS for factory speaker-detection systems, optical S/PDIF input and processed RCA outputs. Verified amplifier specification is 6 x 85 watts RMS at 4 ohms or 6 x 140 watts RMS at 2 ohms at 14.4 V, with Dynamic Headroom output up to 6 x 100 watts RMS at 4 ohms or 6 x 175 watts RMS at 2 ohms.

Best for

Choose Stage 4 if your BMW has Base Audio and you want the DSP amplifier, underseat woofer and front speaker upgrade, but do not need separate tweeters in the front doors.

Before ordering

BMW audio systems vary by model, year and factory option. If you are unsure whether your car is Base Audio, HiFi 676 or RAM 2019+, send us your VIN or registration before ordering and we can help check the correct version.