Sundown Audio


(23 reviews) Write a Review
  • Sundown Audio SUNDOWN AUDIO SALT-4
  • Sundown Audio SUNDOWN AUDIO SALT-4
  • Sundown Audio SUNDOWN AUDIO SALT-4
  • Sundown Audio SUNDOWN AUDIO SALT-4
  • Sundown Audio SUNDOWN AUDIO SALT-4
  • Sundown Audio SUNDOWN AUDIO SALT-4
  • Sundown Audio SUNDOWN AUDIO SALT-4
MSRP: $1,679.99
— You save $280.00

Out of stock


 Sundown Audio Salt 4k Amplifier

• Digital Class-D Linkable Mono Block Amplifier
• Dual MOS-FET PWM Power Supply
• 1 Ohm Stable Load
• 24 dB/Octave – Variable Low Pass Filter
• 24 dB/Octave – Variable Subsonic Filter
• 9 dB/Octave – Variable Bass Boost
• 180° Variable Phase Shift
• 4 Way Protection Ciruit (Thermal, Voltage, Speaker Short, DC Offset)
• Wired Remote Control with Voltage & Temperature Display and Clipping Indicator


SPECIFICATIONS (Tested @ 14.4v)  
2 ohm Linked RMS 8000W
1 ohm Mono RMS 4000W
2 ohm Mono RMS 2000W
4 ohm Mono RMS 1000W
Recommended Fuse Rating 400A
Low Pass Filter (Variable) 35Hz-250Hz
Subsonic Filter (Variable) 10Hz-50Hz
Bass Boost @ 45Hz 0-9dB
Phase Shift Control 0-180 Degrees
Input Sensitivity (+/- 5%) 6v-0.2v
Frequency Response (+/- 1dB) 10Hz-250Hz
S/N Ratio 90dB
Working Voltage 9v-15.5v
T.H.D @ 4ohms < 0.1%
Efficiency @ 4ohms 90% <
Dimensions 22.05″ 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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23 Reviews

  • 5

    Salt 4k

    Posted by Michael Deperna on Nov 24, 2023

    Best amp I have ever owned. Rock solid tank that puts out serious power. You get what you pay for.

  • 5


    Posted by Ricardo c Tinoco jr on Nov 17, 2023

    Best customer service that I’ve ever experienced

  • 5

    Salt 4

    Posted by Brandel on Apr 22, 2023

    Beast of an amp. I love the sound quality of this amp. Plays the music like it was meant to be played. You can't get that with every amp.

  • 5

    Monster amp

    Posted by Osc on Feb 04, 2023

    Great shipping monster of an amp pushing 4 15z sa series with room upgrade shaking the ground

  • 5

    Got salt?

    Posted by Miguel on Dec 07, 2022

    Don't underestimate a 4k especially salt 4 wired at half ohm on two 18 nightshade v5 slams hard with electrical upgrades metered 162.6 at the port ,got two salts il strap soon! Salt no joker

  • 5

    Excellent amp

    Posted by Jonathan Espindola on Oct 10, 2022

    Amp works great

  • 5


    Posted by NEVILLE ALJOE on Aug 17, 2022

    1St o would like to say that I received the amp about 5 days after ordering it. It arrived in perfect condition with my signature (thanks guys) and the Bass knob.. now let me tell yall..this amp is a monster..I have a BMW e63 and it almost takes up the width of the trunk lol.. the shop that installed it only wired it to a 1000w watt configuration due to the ohm load of the sub that I have. But that 1000w that it's supplying has that sub doing the A-town boogie in my trunk..I'm very impressed!

  • 5

    Salt 4k

    Posted by Wily Maunawili on Jun 29, 2022

    Salt 4k has crazy power...D4S customer service is ⭐⭐⭐⭐⭐

  • 5

    Sundown Audio Salt 4

    Posted by John on Apr 05, 2022

    This amp is amazing. Pushing 4 15” speakers with no problem. I would recommend it if you want a lot of power. I like that it has a built in fan to help it stay cool.

  • 5

    Sundown salt 4

    Posted by Chad k pomeroy on Feb 26, 2022

    Best believe the past reviews that iv read up on were all true, its a well built, solid, tank. Quiet operation, beautiful peice of art. Works the same. If...and i mean if.. i had to put somthing negative down, it would only be that i wish the bass knob had a on of/dimmer switch on the digital readout. That things blinding....and that i would have like to see dual power/ground inputs..but im not going to complain, they're engineers are great. Love the amp, would love to buy another one day.

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