4-channel Power Amplifier, 100W RMS/ch at 8 ohms, with Flexible I/O, SmartFan Silent Cooling, Wide frequency response
ART SLA-4 image 1
ART SLA-4 image 1
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A Professional and Flexible 4-channel Power Amplifier!

The ART SLA-4 is a 400W studio linear power amplifier that delivers the clean power necessary for any professional audio or commercial sound environment. A 4-channel, single rack-space amplifier, you can easily switch the ART SLA-4 between multi-channel, stereo, and bridged mono modes. Separate mode switches let you bridge channels one and two, three and four, or both channel pairs for the ultimate in flexibility. A SmartFan cooling system, high-quality decoupling system, and included tamper-proof cover round out the professional ART SLA-4.

ART SLA-4 4-channel, 400W Power Amplifier at a Glance:
  • Flexible four channels
  • Designed for long-term reliability
  • Advanced SmartFan cooling system
  • Easily ties into any system

Flexible four channels
The SLA-4 is a true 4-channel amplifier in a single rack-space that can be switched easily from Multi-channel, Stereo and Bridged Mono Modes. Separate mode switches allow you to bridge channels one and two, or channels three and four, or both channel pairs. This maximizes flexibility by allowing the amp to be configured for best utilization in two, three, or four channel applications.

Designed for long-term reliability
The SLA-4's output is fully protected from short circuits for the ultimate in reliability. An ultrasonic network decouples RF from the output and helps keep the amplifier stable with reactive loads. The SLA-4 is stable into loads as low as 2 ohms (stereo mode) or 4 ohms (bridged mode) making it ideal for virtually any installation application or complex system configuration.

Advanced SmartFan cooling system
The ART SLA-4 features SmartFan, an advanced, thermal dependent fan assisted convection cooled system. The SmartFan system is dependent upon the internal ambient temperature of the unit, and runs at high or low levels depending on the amplifier's cooling needs.

Easily ties into any system
1/4-inch TRS and Euroblock balanced inputs as well as multi-way output binding posts ensure the ART SLA-4 can be quickly and easily tied in to any system without modification.

ART SLA-4 4-channel, 400W Power Amplifier Features:
  • Extremely Low Noise, Discrete Linear Design
  • 4 x 100 Watts/Ch @ 8 Ohms, 140 Watts/Ch @ 4 Ohms
  • 2 x 200 Watts/Ch @ 16 Ohms, 280 Watts/Ch @ 8 Ohms (bridged)
  • 2 x 100 Watts/Ch @ 8 Ohms & 1 x 280 Watts @ 8 Ohms (bridged)
  • Toroidal Transformer
  • 10 Hz to 40 kHz Frequency Response
  • 1/4-inch TRS, and Euroblock Balanced Inputs
  • Recessed "Pop Out" Detented Gain Knobs
  • Tamper-Proof Faceplate Included
  • Multi-way Binding Post Outputs
  • Low Profile 1U Rack-Mountable Design
  • SmartFan Silent Cooling System
The ART SLA-4 is a pro-grade, power amplifier solution!

Additional Media

Power Amp Buying Guide
SLA-4 User Manual
New in Stock at Sweetwater

Tech Specs

Number of Channels 4
Watts/Side @ 8 ohms 4 x 100W
Watts/Side @ 4 ohms 4 x 140W
Watts Bridged 2 x 280W @ 8 ohms
Cooling System SmartFan Silent Cooling System
Inputs 4 x 1/4", 2 x Euroblock
Outputs 4 x Binding Posts
Rack Spaces 1U
Height 1.75"
Depth 13.5"
Width 19"
Weight 19.8 lbs.
Manufacturer Part Number SLA-4

Customer Reviews

Based on 4 reviews
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You get a lot in one rack space

I have been using an ART SLA-1 power amplifier in my rack based live performance sound system for about three years, because size and weight are critical factors in all my equipment choices and the power output is more than sufficient for any venue where I sing. When I determined that I really needed to have a separate channel for my stage monitors, I chose the SLA-4 based on my extreme satisfaction with the SLA-1. So far, I have only used it for two performances, but the operation and performance are identical the SLA-1, but with the addition of two more channels. Hey, i could add a subwoofer! The toroidal transformers produce great power with significant weight savings from conventional transformers. The cooling fan is slightly louder than the fan on the SLA-1, but then it is cooling four channels instead of two. It is not annoyingly loud, or even really noticeable except by the operator, and then only when the room is otherwise silent. I highly recommend this amplifier, especially for a traveling sound system when size and weight are considerations.
Music background: Former church sound man, now traveling minister/recording artist


Great amp, clean, quiet and love the 1u size...
Music background: Recording Engineer, Musician

art sla4 - awesome

I love this amplifier. Its small, robust and quiet. The cooling fanmakes virtually no noise even in my studio in dead silence, I can't hear it. Plent of power for monitors.
Music background: recording engineer, musician.

Nice clean amp

This amp is very clean for what I use it for.. It drives my home stereo and studio monitors. My high end floor speakers never sounded this good with the receiver amp. I'm thinking about getting another one for my Home theater system.. Thanks Sweetwater and ART for good products at a fair price.
Music background: Recording, Live Sound Engineer, Bass Player
See also: Power Amps, ART, ART Power Amplifiers