Sundown Audio 8" 400 Watt RMS Dual 2-Ohm SD-Series Neo Subwoofer SD4-8-D2

• Optimized for sealed enclosures (0.33–0.5 cu ft); not recommended for ported use
• Advanced “W” foam surround for low distortion
• Spring-loaded push terminals for secure wiring
• Stitched tinsel leads for durability under high excursion

Sundown Audio 8" 400 Watt RMS Dual 2-Ohm SD-Series Neo Subwoofer SD4-8-D2

This listing Includes

• (1) 8" 400 Watt RMS Dual 2-Ohm SD-Series Neo Subwoofer

Description:

The Sundown Audio SD4-8-D2 subwoofer is built for those who need high-end sound quality and power in a compact, shallow-mount design. Its lightweight neodymium motor structure, advanced "W" surround, and patented cast aluminum frame deliver low distortion and high output in sealed enclosures as small as 0.33 cu ft. With stitched tinsel leads, spring terminals, and a high-temp copper voice coil, this sub is engineered for clean, powerful bass in tight spaces.

Features:

• Lightweight Neodymium Motor


• Dual 2 Ohm Voice Coils


• Optimized for Small Sealed Enclosures (0.33-0.5 cu ft)


• Two-Inch, 8-Layer Copper Voice Coil


• Computer-Optimized "W" Foam Surround


• Cast Aluminum Frame with High Strength Patented Design


• Spring-Loaded Push Terminals


• Stitched-On Tinsel Leads


• High-Temperature Voice Coil Wire


• Large Aluminum Faraday Ring for Smooth Response


• Not Recommended for Ported Enclosures

Specifications:

• RMS Power: 400 Watts


• Impedance: Dual 2 Ohm


• Sensitivity: 81.6 dB @ 1W/1m


• Fs (Resonant Frequency): 35.68 Hz


• Vas: 12.16 L


• Qts: 0.53


• Xmax: 14.5 mm


• BL: 13.17 N/A


• Le: 4.42 mH

Dimensions

• Mounting Depth: 4.60 inches


• Outside Diameter: 8.70 inches


• Cutout Diameter: 7.30 inches


• Displacement: 0.07 cu ft


• Recommended Sealed Enclosure: 0.33 – 0.5 cu ft


• Ported Enclosure: Not Recommended

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.

Why Can’t I Track My Order?

If you're having trouble tracking your order:

• Make sure you’ve received the shipping confirmation email with the tracking number.
• Log into your account on our website and use the “Check Your Order Status” button.
• If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.