Sundown Audio Marine & Powersports Monoblock Amp 400W Class D SDX w/ Bass Knob

• Digital Class-D Mono Block Amplifier
• Dual MOS-FET PWM Power Supply
• 1 Ohm Stable Load
• 12 dB/Octave Variable Low Pass Filter
• 4 Way Protection Circuit (Thermal, Voltage, Speaker Short, DC Offset)

Sundown Audio Monoblock Marine & Powersports Amplifier 400W Class D (SDX Series) w/ Bass Knob

Moderate power, tiny size, but at the top-end of Full-Range Class-D fidelity. The controls will have a removable cover that bolts down on top of them. The overall case is a big chunk of cast aluminum to keep temperatures in check!

This listing includes:

• (1) Sundown Audio Marine Grade Monoblock Amplifier SDX-400.1


• (1) Sundown Audio Remote Bass Control Knob


• Includes Mounting Hardware and Manual

FEATURES

• Digital Class-D Mono Block Amplifier


• Dual MOS-FET PWM Power Supply


• 1 Ohm Stable Load


• 12 dB/Octave - Variable Low Pass Filter


• DC Auto sense feature


• 0 to 12dB - Variable Bass Boost


• 4 Way Protection Circuit (Thermal, Voltage Speaker short and DC Offset)


• Wired Remote Control

SPECIFICATIONS

• Mono Block Class-D Amplifier


• 1 x 400W at 1 Ohm


• 1 x 300W at 2 Ohm


• 1 x 175W at 4 Ohm


• Recommended Fuse Rating: 40A


• LoW Pass Filter (-12dB/8) Variable: 50hz-250hz


• Input Sensitivity: 6V Max


• S/N: >90dB


• Cast Aluminum Heat Sync


• Water Resistant


• Highpass / Lowpass / Bandpass Filter


• Gain Adjustment


• Suitable for vehicles with start / stop function


• Dimensions in mm (LxWxH): 147 x 102 x 54 mm

Dimensions (L x W x H): 5.82 x 3.42 x 1.73 (148 x 87 x 44 mm)

Note: Unscrew the badge using an Allen key to access audio settings.

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.