Sundown Audio SFB 5-Channel 1800W 1-Ohm Full-Range Class-D Amp SFB-180 — Big Jeff Audio Dealer Platform
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Sundown Audio SFB 5-Channel 1800W 1-Ohm Full-Range Class-D Amp SFB-1800.5

This Listing Includes:

  • (1) Full-Range Class-D 1-Ohm Stable 5 Channel Amplifier

Going along with the budget friendly trends in the industry, We decided it was time to play along. Introducing the "Sundown Full Bridge" line of amplifiers, "SFB" for short. These amps pack a huge punch in a fairly small footprint. Due to the full bridge technology, these amplifiers are not strappable however you can line up multiple amps together to create a massive powerhouse in the same, if not smaller, footprint of your standard half bridge predecessors for a fraction of the cost.

All of the SFB 4ch amp’s power ratings are listed at the 1-Ohm rating. For instance, the SFB-500.4 is 500Wrms at 1-Ohm per channel. This allows you to run many more speakers together in a multitude of different wiring configurations than using a standard Class A/B/D half bridge design. These are the perfect amplifiers for large systems where you have a plethora of pro drivers in multiple doors or line arrays.

All SFB mono amplifiers are full range. This not only allows you to run subwoofers as you would most mono amps, but you can also run a large arrays of mids/highs on these amps as well. The crossovers on the mono SFB amps can attenuate from 15hz all the way up to 20khz. This allows you to set bandpass crossover points and dial in whatever frequency you desire for your setup no matter the type of speaker you are using.

The SFB series amps are considered to be a "Brazilian Style" of amplifier. This technology is not new and has been around for quite a while however, the use of them has surged dramatically in the past few years. These little amplifiers are known to be the best bang for your buck. If you are looking for raw power on a budget, look no further than the SFB Series from Sundown Audio.


  • High Efficiency Digital Multi-Channel Design
  • 12 dB/Octave - Variable Low Pass Filter
  • 12 dB/Octave - Variable High Pass Filter
  • Variable Bass Boost
  • Clipping Indicator
  • 4 Way Protection Circuit (Thermal, Voltage, Speaker Short, DC Offset)
  • Optional Wired Remote Control with Clipping Indicator


  • 1/2-Channel @ 2-Ohm 300w RMS
  • 3/4-Channel @ 4-Ohms 200w RMS
  • 5-Channel @ 1-Ohm 1000w
  • 5-Channel @ 2-Ohm & 4-Ohm : 500 @ 2-Ohm / 250 @ 4-Ohm


  • Length: 16"
  • Width: 12"
  • Height: 5"

Payment Information


We accept PayPal for all ebay orders. You can use your credit through PayPal as all major credit card are accepted by PayPal.

We accept PayPal for all international orders, your address must be verified with PayPal.

We are not responsible for any custom duties or brokerage fees that may apply for all international orders.

When you click on the Buy it Now button you are entering into a
contract whereby you agree to purchasing the item at the price listed.

If you want to ship your item to an alternate address please add
that address on your PayPal account and use the address as the default
or confirmed address to pay us through PayPal

With Free Same Business Day Shipping we work to get you your order Fast. 


All orders over $500 will require a signature for delivery.

All pre-selected shipping rates and methods are for customers with a
valid residential or commercial address within the Contiguous 48 United
States (PO Boxes address may require additional charges).

P.O. Boxes, APO/FPO addresses, Alaska, Hawaii, Puerto Rico, Guam,
U.S. Virgin Islands, Northern Mariana Islands, American Samoa, Canada,
and other countries may require additional shipping fees. Please contact
a member of our team for detailed shipping charges.

Shipping is available only to PayPal verified addresses. When making
payment please confirm your address has been verified with PayPal. Once
payment is made shipping address can not be changed/altered. Payments
made using an unverified PayPal address will be refunded and order will
be canceled.

We will not accept request to change shipping address once payment
has been made. Please confirm your shipping address is up-to-date and

Typical handling time for orders is 1-business day. We do our best
to ship every package with-in 1 business day of receiving a cleared
payment. In some circumstances additional time may be need, in which
case we will contact buyer.

Shipped orders that are returned by the shipping company due to an
insufficient address or an undeliverable address will be refunded less a
20% restocking fee.

If package is refused or marked undeliverable and returned
back to us by the carrier, you will need to pay the shipping cost in
full to have the package sent back to you or we can refund the money
minus the cost of shipping


If you have not received your package, but the tracking information shows that it was delivered,
please do the following within 36 hours of expected, stated delivery:


Verify the shipping address on the order is the address where you are looking for the package

Look for a notice of attempted delivery

Look around the delivery location for the package, or see if a neighbor has accepted the delivery

Be sure to double check your mailbox and other usual spots for package delivery


If you think that your package has been stolen, we will require a police report since this is now theft.
Once we have a police report on file for the stolen package, we will reship your order.