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

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Aesthetically, the traditional double red stitching of the DD Redline models has been replaced by a red stripe – the "redline" – located between the cone and the thermoformed multi-layer top surround.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

  •  

🔊 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

Enjoy 5% off all pre-order products.

The discount is automatically applied to your cart.

The announced delivery times are given as an indication and expressed in working days.

They may be extended in case of supplier holidays, carrier delays, or unfavorable weather conditions.

We make every effort to keep you informed and ensure the delivery of your order as quickly as possible.

If you have any questions, please contact us via the website chat or consult our General Terms and Conditions of Sale, available at the bottom of the page.

The Sound Auto Concept Team

To track your order, we invite you to use the Chat available at the bottom right of the store ➡️⬇️

If you have any questions regarding your order, our team will respond to you as soon as possible 🙂

if you found it cheaper elsewhere! CLICK HERE

Sound Auto Concept offers you gifts all year round! We give you a 5% discount, which is automatically added to your cart for pre-ordered products.

Are you planning to purchase a complete system or products in quantity?

Don't miss your chance! Feel free to contact us via the chat box on our website.

Our team will be happy to discuss your needs and offer you the best possible price.

We are here to help you achieve your project under the best conditions!

The Sound Auto Concept team.

We offer several delivery options to meet your needs.

Free shipments are made via a relay point.

If you prefer home delivery, a surcharge may apply when ordering.

For shipments outside France, please refer to our "Deliveries and Returns" section for more information.

Do not hesitate to contact us for more details!

Our team is at your disposal by telephone at 09.85.13.66.35 or the Chat box to help you select the products that suit you best 💡😉

We can help you create a cart directly via live chat if you are unsure about your choice. Our team will be happy to offer you their technical expertise 💪🙂

For returns, you have 14 days after receiving your items to return them if you are not entirely satisfied 🔁

Please note: refusing a package upon delivery does not constitute a valid withdrawal request and does not trigger the 14-day legal period, in accordance with our General Terms and Conditions of Sale (GTC).

For detailed information on procedures, we invite you to consult our return policy or contact us directly 📧