Cadence Pro Car Audio 8" 400 Watt RMS 4-Ohm Dual Voice Coil Subwoofer US8D4

• Delivers 400W RMS and 800W peak power for rich, impactful bass performance in compact setups.
• Wire in parallel for 2 ohms or in series for 8 ohms, offering flexibility for different amplifier configurations.
• Kevlar-reinforced ultra-stiff paper cone ensures durability, clarity, and accurate sound reproduction.
• Natural rubber surround and 9mm Xmax provide smooth, distortion-free low-frequency movement.

Cadence Pro Car Audio 8" 400 Watt RMS 4-Ohm Dual Voice Coil Subwoofer US8D4

This Listing Includes:

• (1) Cadence US8D4 8" Car Subwoofer


• User Manual

Discover the depth of true bass with the Cadence US8D4 from the Ultra Shock Series. Compact, powerful, and beautifully engineered, this 8-inch subwoofer delivers exceptional clarity and depth while maintaining the bold, aggressive look that defines the Cadence sound. Its bright orange frame and Kevlar-reinforced cone showcase the perfect balance between design and performance.

Equipped with dual 4-ohm voice coils, the US8D4 offers versatile wiring configurations. Wire it down to 2 ohms for aggressive, high-output performance, or up to 8 ohms for multi-speaker setups that prioritize clarity and efficiency. With 400 watts RMS and 800 watts peak power handling, this subwoofer is built to hit hard and stay cool under pressure.

Specifications:

• Application Type: Car


• Model Series: US (Ultra Shock)


• Model Number: US8D4


• Size & Type: 8" Subwoofer


• Basket: Stamped Steel


• Cone: Kevlar Reinforced Ultra-Stiff Paper Composite


• Surround: High Excursion Natural Rubber


• Magnet: Aero Style Motor with Heat Pump Cooling


• Voice Coil: Dual 4 Ohm Voice Coil

Performance:

• Power Handling: 400W RMS / 800W Peak


• Frequency Response: 40 Hz - 800 Hz


• Sensitivity (SPL @ 1W/1m): 87 dB


• Impedance: Dual 4 Ohm


• Xmax: 9 mm


• FS: 54 Hz


• QTS: 0.46


• VAS: 7.92 L

Installation:

• Mounting Depth: 3.74" (95 mm)

Recommended Enclosures:

• Ideal Sealed Box Volume: 0.20 cu ft (5.66 L)


• Ideal Ported Box Volume: 0.40 cu ft (11.33 L)


• Port Diameter: 2.0"


• Port Length: 8.5"

Dimensions:

• Length: 11 in (279 mm)


• Width: 11 in (279 mm)


• Height: 8 in (203 mm)


• Weight: 15 lbs (6.8 kg)

Accepted Payment Methods at Big Jeff Audio

At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

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• Make sure you’ve received the shipping confirmation email with the tracking number.
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