Speakers 4 Inch Stereo Pair BMW 1 Series, 3 Series, 5 Series

Dietz CX-BM4 4 Inch 2-Way Coaxial BMW Speaker Upgrade Set

Transform the flat, muffled sound in your BMW with the Dietz CX-BM4 coaxial speaker set. Purpose-engineered with BMW's signature three-point mounting flange, these speakers physically bolt directly into factory door cards and rear shelf locations across a wide range of E-series models without cutting or custom bracket fabrication.

Designed for Base and Mid-Tier Sound Systems

The CX-BM4 is 4 Ohms, making it ideal for BMW vehicles equipped with Base Audio or Stereo systems (which lack factory door tweeters). It replaces the full-range paper cone drivers to instantly add crisp high frequencies and detailed vocal definition. Please note that this 4 Ohm speaker is not designed to replace 2 Ohm drivers in premium Logic7, Harman Kardon, or Individual Sound factory amplified systems.

Silk Dome Tweeter & Ultra-Shallow Mounting Depth

Standard aftermarket speakers often hit the window glass or mechanism inside shallow BMW doors. The CX-BM4 solves this with an ultra-shallow mounting depth of 34.5 mm. Featuring a 21 mm silk dome tweeter paired with a durable polycone mid-range driver, it delivers smooth highs and clear mid-range sound. The integrated tweeter protrudes slightly (54 mm total flange height), so ensure your factory door panel grille has adequate front clearance.

Important Compatibility & Fitment Advisory

While the physical 3-bolt layout matches specified BMW models, please keep the following in mind prior to ordering: these speakers feature integrated screw-down terminals rather than the OEM BMW clip plug, allowing straightforward connection via bare wire ends or fork connectors. Additionally, factory speaker depth and door trim clearance vary across Coupe, Convertible, Wagon, and Sedan door cards.

While this product is engineered for specified factory fitments, classic vehicles often feature subtle mid-year production changes, regional options, or modifications by previous owners. We strongly recommend checking your existing factory wiring, speaker size, and physical mounting clearance before placing your order to ensure complete compatibility with your specific vehicle.

Specifications:

• System Type: 2-Way coaxial loudspeaker system (10 cm / 4 inch)
• Power Handling: 65 Watts Max Power
• Mid-Range Cone: 118 mm polycone driver for clean mid-range response
• Tweeter: 21 mm silk dome tweeter for smooth, detailed highs
• Impedance: 4 Ohms (designed for Base / Standard factory audio)
• Frequency Response: 150 Hz - 21,000 Hz
• Mounting Depth: Ultra-shallow 34.5 mm (approximate)
• Cutout Diameter: 98 mm (approximate)
• Flange Outer Height: 54 mm (approximate)
• Connections: Integrated screw-down terminal block (accepts bare wire or fork terminals)

Supplied As:

• 1 Pair of Dietz CX-BM4 coaxial speakers (2 pieces)

Direct 3-Bolt Physical Models - Always Check Fitment Before Ordering:

• BMW 1 Series: E81 (3-Door), E82 (Coupe), E87 (5-Door), E88 (Convertible) - Front Doors
• BMW 3 Series: E90 (Sedan), E91 (Wagon), E92 (Coupe), E93 (Convertible) - Front Doors / Rear Shelf
• BMW 5 Series: E60 (Sedan), E61 (Wagon) - Front Doors / Rear Shelf
• BMW X1: E84 - Front Doors