- Delivers massive full-range output with up to 1050W RMS per channel at 1 Ohm for extreme car audio builds
- High efficiency Class D design provides serious power while maintaining compact installation flexibility
- Variable HPF, LPF, and bass boost controls allow precise tuning for mids, highs, speakers, or subwoofers
- Built-in clipping indicator helps protect your equipment and optimize amplifier performance
- Smart Cooler fan system automatically activates based on temperature or audio demand for improved reliability
Sundown Audio SFB-1000.4D 4 Channel Class D Full Range Car Amplifier 1000W RMS 1 Ohm Stable
This Listing Includes:
- (1) Sundown Audio SFB-1000.4D 4 Channel Amplifier
The Sundown Audio SFB-1000.4D is built for serious power, clean output, and flexible full-range performance in high-demand car audio systems. Designed with Sundown’s high-efficiency Class D technology, this compact 4 channel amplifier delivers massive output while maintaining excellent control, reliability, and thermal management.
With up to 1050 watts per channel at 1 Ohm, the SFB-1000.4D is capable of driving mids, highs, speakers, or even subwoofer setups with authority and clarity. Variable high-pass and low-pass filters, adjustable bass boost, and a built-in clipping indicator give you the control needed to properly tune your system for maximum performance.
Sundown’s Smart Cooler system automatically activates the cooling fan based on temperature or audio demand to help maintain efficiency during long demo sessions and heavy daily use. Built-in 4-way protection circuitry helps safeguard your investment against voltage issues, overheating, short circuits, and DC offset.
Whether you’re building an aggressive demo vehicle or upgrading your daily driver, the SFB-1000.4D delivers the power and tuning flexibility serious car audio enthusiasts demand.
Features:
- High efficiency Class D full-range 4 channel amplifier
- Massive power output with 1 Ohm stability
- Variable 12dB high-pass and low-pass filters
- Adjustable bass boost for added low-end response
- Built-in clipping indicator for safer tuning
- Smart Cooler fan system with temperature and audio activation
- 4-way protection circuitry for long-term reliability
- Optional wired remote control compatibility
Specifications:
- Number of Channels: 4
- RMS Power @ 4 Ohm: 350W x 4
- RMS Power @ 2 Ohm: 590W x 4
- RMS Power @ 1 Ohm: 1050W x 4
- Frequency Response: 10Hz - 20KHz
- Signal to Noise Ratio: 100dB
- Input Sensitivity: 200mV
- High Pass Filter: 15Hz - 6KHz Variable
- Low Pass Filter: 50Hz - 6KHz Variable
- Bass Boost: 0 - 12dB @ 50Hz
- Input Impedance: 56k Ohms
- Minimum Supply Voltage: 9VDC
- Maximum Supply Voltage: 16VDC
Protection Features:
- Thermal Protection
- High Voltage Protection
- Low Voltage Protection
- Speaker Short Protection
- DC Offset Protection
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
Bank Transfers
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.
