Sundown Audio


(8 reviews) Write a Review
MSRP: $1,127.99
— You save $188.00


• Full Range Digital Amplifier
• High Efficiency Digital Multi-Channel Design
• Stable – 2 Ohms Stereo / 4 Ohms Bridged
• 12 dB/Octave – Variable Subsonic Filter
• 12 dB/Octave – Variable High Pass Filter
• 12 dB/Octave – Variable Low Pass Filter
• Crossover Multipliers – X1 / X10
• Clipping Indicator
• 4 Way Protection Circuit (Thermal, Voltage, Speaker Short, DC Offset)
• Optional Wired Remote Control with Voltage & Temperature Display and Clipping Indicator


SPECIFICATIONS (Tested @ 12.8v)  
4 ohm Mono RMS 1400W x 2
2 ohm Stereo RMS 700W x 4
4 ohm Stereo RMS 500W x 4
Subsonic Filter (Variable) 10Hz-50Hz
High Pass Filter (Variable) 50Hz-500Hz (X1) 500Hz-5000Hz (X10)
Low Pass Filter (Variable) 50Hz-500Hz (X1) 500Hz-5000Hz (X10)
Frequency Response (+/- 1dB) 10Hz-25KHz
Input Sensitivity (+/- 5%) 6v-0.2v
S/N Ratio 105dB
T.H.D @ 4ohms < 0.1%
Efficiency @ 4ohms 75% <
Recommended Fuse Rating 300A
Dimensions 14.96″ x 8.67″ x 2.80″
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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
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8 Reviews

  • 5

    Salt 500.4 powerhouse!!

    Posted by David Walton on Mar 08, 2023

    This amp is more power than I needed but I ordered it during the tax time sale to take advantage of the great price. The amp looks like a work of art mounted above my Salt 8 on my amp rack. The sound quality is excellent, the vocals in my setup are now warm, strong and loud with this amp. JP and Down4soundshop is where I buy all of my car audio because you get the best customer service in the industry, best prices and delivery is fast. I've been a customer since 2016 and I will be one for life.

  • 5

    Absolute power!

    Posted by Lloyd OBryan on Oct 24, 2022

    This amplifier is no joke! Very powerful!

  • 5

    Absolute power!

    Posted by Lloyd OBryan on Oct 10, 2022

    2800 watts of RMS power to play with is awesome.

  • 5

    Sundown 4ch

    Posted by Shannon on Mar 23, 2022

    I love this Amp very powerful and your getting more then you paid for

  • 5


    Posted by Shannon on Mar 10, 2022

    One of the best amps I have ever owned

  • 5

    Salt 4chanels

    Posted by Kamil supinski on Nov 25, 2021

    Thank you Johnathan order shipping as usually,very fast.Product as usually 5*.Overall 5*.Recommended all.Thank you Johnathan.I see you on next one.Five

  • 5

    Salt 500.4

    Posted by Christopher Harris on Oct 20, 2021

    I have owed both the sfb 500.4 and the salt 500.4. I think both sound good but the salt 500.4 to me sounds incredible. I'm running 4 ds18 6.5 pro neor for high mids and 4 ds18 10" pro neor for low mids off this one amp and it sounds amazing well worth what I paid.

  • 5


    Posted by Kamil Supinski on Sep 13, 2021

    Thank you Jonathan for the fast shipping. I am very happy with this amp, as well as the rest of the others. Super dude, I recommend it to everyone, this amp is very powerful, no joke.

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