Sundown Audio U-Series v.2 12" Subwoofers w/Apocalypse ATOM 3.5K PRO Amp Combo

• Elevate your car audio with the Sundown U Series v.2 Subwoofers and Apocalypse ATOM 3.5K PRO Amplifier Combo.
• Dynamic duo for exceptional bass and powerful amplification.
• Superior heat dissipation with black aluminum 3" voice coil.
• Versatile audio shaping with Apocalypse ATOM 3.5K PRO's filters.
• Experience powerful, customized, and crystal-clear car audio.

Sundown Audio U-Series V.2 1750W Peak Dual Voice Coil Subwoofers

This Listing Includes:

• (2) Sundown Audio U-Series 12" 4 Ohm DVC Subwoofer


• (1) Apocalypse ATOM 3.5K PRO Power Amplifier


• (1) Apocalypse ATOM Voltmeter & Bass Knob

Immerse yourself in the pinnacle of car audio excellence with the dynamic combo of the Sundown U Series v.2 12" Subwoofer and the Apocalypse ATOM 3.5K PRO Monoblock Amplifier.

Experience the perfect harmony of exceptional bass from the Sundown U Series v.2 Subwoofer and powerful amplification with the Apocalypse ATOM 3.5K PRO Monoblock Amplifier – a combination designed to redefine your car audio journey.

Features Speaker:

• Black Aluminum 3" voice coil for superior heat dissipation.


• Double-stitched surround and heavy-duty cast baskets.


• Spring-loaded terminals accept up to 8 gauge.


• Optimized for small ported or bandpass enclosures.


• Innovative high-velocity cast aluminum vented frame spacer ring.

Specifications Speaker:

• Model: U Series v.2 12" Subwoofer.


• RE (Ohms): 3.8407 / 6.0577.


• FS (Hz): 41.3260 / 41.9087.


• VAS (L): 14.7612 / 14.7535.


• Qes: 0.4862 / 0.5870.


• Qms: 4.7454 / 4.9022.


• Qts: 0.4410 / 0.5242.


• Le (mH): 3.1858 / 4.3694.


• BL (NA): 27.2694 / 31.1265.


• Mms (Grams): 358.6438 / 356.5462.


• Cms (uM/N): 40.4709 / 40.4498.


• Sens (dB @ 1w/1m): 85.1980 / 84.4191.

Features Amplifier:

• High RMS power for dynamic bass output.


• Tailored bass control for customized sound.


• Versatile audio shaping with multiple filters.


• Compact, efficient Class D technology.


• Crystal-clear audio with superior signal quality.

Specifications Amplifier:

• Model: ATOM 3.5K PRO.


• Class: D.


• Channels: 1.


• Frequency Response: 10 - 250 Hz.


• RMS Power (14.4 V): 3500W at 1 Ohm, 2900W at 12V, 2200W at 2 Ohm, 1210W at 4 Ohm.


• Minimum Permissible Load: 1 Ohm.


• Low Pass Filter: 80 - 20000 Hz, 12 dB/Oct.


• Subsonic Filter: 10 - 80 Hz.


• Bass Frequency Adjustment: 35 - 90 Hz.


• Input Terminal: 0 Ga.


• Output Terminal: 4 Ga.


• Working Voltage: 9 - 15 V.


• Signal-to-Noise Ratio: â 85 dB.

Dimensions Amplifier:

• Size (WxLxH): 10 x 8.6 x 2.6 inches

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.