DD Audio 606d-D4 – 6.5" Dual Voice Coil Subwoofer 600W RMS / 1500W Max

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• 🟢 In stock: product available in our warehouse, ready to be shipped.
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🚚 Free delivery on orders over €49 with Chronopost Économique to a pickup point (estimated delivery time of 4 to 10 business days).

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Other faster delivery methods are also available depending on the products and your delivery address.

📦 Preparation and shipping

In-stock products ordered before 12 p.m. are generally shipped the same day. After 12 p.m., shipping generally takes place on the next business day.

Pickups are available Monday through Friday, excluding holidays.

🚚 Our delivery methods

• Chronopost Économique pickup point: free delivery with purchases of €49 or more (4 to 10 business days).
• Chronopost 24h pickup point: fast delivery to a pickup point.
• 24h home delivery: our only home delivery option. Please note that this delivery method is not considered a guaranteed express delivery.

Delivery times begin once the carrier has accepted the package and are provided as estimates in business days.

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Some heavy or bulky packages may incur additional shipping and handling fees, which are automatically displayed in your cart.

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📞 Phone: 09 85 13 66 35

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🕒 Our hours:

• Tuesday to Saturday
• Mornings: 9:30 am – 12:00 pm
• Afternoons: 1:30 pm – 6:00 pm

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💪 Take advantage of our technical expertise to order with complete confidence!

The Sound Auto Concept Team

The completely redesigned Redline 600 subwoofers offer significantly improved performance over their predecessors. The new chassis and suspension design lowers the resonant frequency (Fs) while increasing excursion for deeper, more dynamic bass.

The voice coils have also been improved: better thermal resistance, reduced inductance, and higher efficiency. This translates to a more balanced sound, higher output levels with the same amplifier, and enhanced overall efficiency.

Aesthetically, the traditional double red stitching of the DD Redline models has been replaced by a red stripe – the "redline" – located between the cone and the thermoformed multi-layer top surround. The dust cap features a reflective metallic foil logo, while the cones and dust caps have a matte black finish. The chassis, meanwhile, displays an embossed or molded DD logo.

The new versions retain the brand's iconic technical elements: triple coil ventilation, braided cables integrated into the triple bottom suspension, laminated bottom suspensions, and extended pole pieces. The cone, made of a blend of fiberglass and paper with a moisture-resistant coating, remains lightweight, strong, and perfectly suited for the automotive environment.

Recommended enclosure volumes:

• Sealed: 7 to 14 L

• Ported: 7 to 22 L

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🔊 General Specifications

• Speaker Size: 6.5"

• Impedance: D4 (Dual 4Ω Voice Coil)

• Shipping Weight: 10.5 lbs

⚡ Power

• RMS Power: 300–600 W

• Peak Power: 1800 W

🛠️ Mechanical Parameters & Dimensions

• Mechanical Excursion (Xlim): 56 mm

• Maximum Excursion (Xmax): 9 mm

• Piston Diameter: 5.375"

• Outer Diameter: 7"

• Outer Diameter with Gasket: 7 1/8"

• Mounting Diameter: 5 7/8"

• Mounting Depth: 4 1/2"

• Motor Diameter: 5 1/2"

• Motor Depth: 2"

• Isolation Voltage (Coil Height): 2"

📡 Thiele/Small Parameters

• Fs (Resonant Frequency): 43.74 Hz

• Qms: 4.907

• Qes: 0.558

• Qts: 0.501

• Vas: 4.395 L

• HP Displacement (Displacement): 0.04 ft³

📦 Enclosure Recommendations

• Sealed Enclosure: 0.25 – 0.5 ft³

• Ported Enclosure: 0.25 ft