Sundown Audio

SUNDOWN AUDIO SFB-1800.5D ( 5 Ch Full Range Amplifier)

(7 reviews) Write a Review
  • Sundown Audio SUNDOWN AUDIO SFB-1800.5D 5 Ch Full Range Amplifier
  • Sundown Audio SUNDOWN AUDIO SFB-1800.5D 5 Ch Full Range Amplifier
MSRP: $575.99
— You save $96.00


The new SFB series is being kicked off with  1800.5D a 5 Channel Full Range Amplifier. This is a "full range" mono ideal for "PA" type speakers as well as standard bass applications. 

1-2 channel at 2 ohm - 300 w rms

3-4 channel at 4 ohms  200 w rms

5 channel, at 1 ohm:  1000w

5 Channel; at 2 & 4 ohm : 500 at 2 / 250 at 4

View AllClose

Warranty Information

Warranty Information

Sundown Audio requires us to send customers with equipment problems directly to them for all warranty and non-warranty claims. Please follow their proceedures..


Sundown Audio RMA form:

Sundown Audio Product Warranty Information:


Sundown Audio - Hours of Operation

Monday 9am - 5pm EST
Tuesday 9am - 5pm EST
Wednesday 9am - 5pm EST
Thursday 9am - 5pm EST
Friday 9am - 5pm EST
Saturday Closed
Sunday Closed
View AllClose

7 Reviews

  • 2

    Posted by Connor on Mar 29, 2023

    Amp creates a lot of noise that plays through channels 1-4, I double checked my whole setup before contacting sundown and was told that this 600$ amp was one of their budget models and it was to be expected. Extremely disappointed with that but noise goes away by lowering gain to almost quiet and cranking head unit up. It bumps well and sounds great otherwise but really disappointed that Sundown (a top tier brand) would consider this normal behavior of any of their amps.

  • 5
    Absolute tank

    Posted by Luka Jankovic on Mar 22, 2023

    Had this amp over a year already. Running component 6.5s and 6x9s as well as a pair of Alpine Type R 12s at 1ohm . One amp runs the whole system with loads of power. Only downfall is amp does produce some noise at idle. Even with the gains set with a DD-1, Ground loop isolators and a capacitor.

  • 5
    SFB 1800.5

    Posted by Arturo Perez on Aug 09, 2021

    First, JP and the team are awesome! My amp arrived fast, packaging was good with a thank you and a lollipop. Keep up the great customer service! Oh, the amp is a powerhouse. Lovin’ life!

  • 5

    Posted by Al on Jul 20, 2021

    Powerful and great sounding amp!

  • 5
    Sundown Audio 5 channel amp

    Posted by Frederick Hogans on Apr 01, 2021

    One amp powers whole system, this all you need,its clean and very efficient.Down4sound youre the best,no sales tax, free shipping and two day delivery.

  • 5
    SFB 1800.5

    Posted by John Houck on Mar 01, 2021

    Quite impressive for the price. Sundown never fails to amaze with their products and Jonathan Price never fails at keeping his word with super quick shipping. Only place I will buy car audio products

  • 5

    Posted by Rakeem Jackson - STM on Jul 12, 2020

    When will this be available?

View AllClose