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SSOUNDS A4-400
4-channel 1U Class-D installation amplifier, 4 × 400 W into 8 Ω, XLR and Euroblock inputs, speakON outputs.
Not every installation needs a touring amplifier. The A4-400 is a 4-channel 1U Class-D rack amplifier at 400 W per channel into 8 Ω for the background music, paging and fill zones of a building: analog XLR and Euroblock inputs with link outputs for daisy-chaining a source along the rack, speakON outputs, input sensitivity selectable per channel between 0.775 V and 1.4 V, and stereo, bridge and parallel modes. The front panel carries a gain control per channel and protect, clip and signal indicators. We specify it for retail, restaurants, hotels, schools, offices and public address zones.
Key features
- 4 × 400 W into 8 Ω, 4 × 530 W into 4 Ω
- 19″ 1U rack
- 20 Hz to 20 kHz (±0.5 dB), THD ≤ 0.03%
- Stereo, bridge and parallel modes
- XLR and Euroblock inputs with link outputs
- 4 × speakON outputs
- 0.775 V or 1.4 V input sensitivity per channel
- Gain control and protect, clip and signal indicators per channel
Specifications
Engineering data. The conditions each figure is specified under are stated below the table.
General
- Type
- 4-channel Class-D power amplifier, analog input
- Protection
- Soft start · undervoltage · overvoltage · overheat · overload · overcurrent · DC
- Front panel
- Gain control per channel · power switch · protect, clip and signal indicators
Electrical
- Channels
- 4
- Power @ 8 Ω
- 4 × 400 W
- Power @ 4 Ω
- 4 × 530 W
- Bridged
- 2 × 1,050 W
- Operating modes
- Stereo · bridge · parallel
- Mains
- 220–240 V, 50/60 Hz
Performance
- Frequency response
- 20 Hz – 20 kHz (±0.5 dB)
- Signal-to-noise ratio
- ≥ 105 dB
- THD
- ≤ 0.03%
- Damping factor
- > 240 (1 kHz, 8 Ω)
- Slew rate
- 15 V/µs
Connections
- Inputs
- 4 × XLR input · Euroblock input and link out
- Outputs
- 4 × speakON
- Input sensitivity
- 0.775 V / 1.4 V, selectable per channel
Physical
- Format
- 19″ 1U rack
Downloads
Product documentation, free to open. No registration, no form. The data sheet is a PDF rendered from the page below it; the manual is a print page, so use your browser to print it or save it as PDF.
- Technical data sheetFull specification set with the measurement conditions for each figure, modelled response curves, safety notices and warranty terms.PDF · SS-DS-A4-400-EN-A4 · Rev. 2610 · Issued 08 Oct 2026
- Technical data sheet, in your browserThe same document as a page, if you would rather read it here or print it yourself.HTML print view · SS-DS-A4-400-EN-A4 · Rev. 2610 · Issued 08 Oct 2026
- Architectural and engineering specificationThe “shall be” paragraph for tender documents and bills of quantities, written from this product’s own specification rows. Section of the data sheet.HTML section · SS-DS-A4-400-EN-A4
- User manualUnpacking, connection, installation, operating limits, maintenance schedule and troubleshooting for this model.HTML print view · SS-UM-A4-400-EN-A4 · Rev. 2610 · Issued 08 Oct 2026
Loudspeaker data files for prediction software (GLL and CLF for EASE), 2D and 3D drawings and certification documents are issued on request. Email support@s-soundspro.com and we will send the current release for this model.
