PURIFI 1ET400A 2-Channel

Orders typically ship within 7-10 days
All amplifiers are individually assembled and tested to ensure the highest quality and performance.
$1,075.00Buy Now
  • 450 watts @ 2 ohm
  • 425 watts @ 4 ohm
  • 225 watts @ 8 ohm
  • S/N: 131dB
  • FR: 20 - 20KHz
  • THD: 0.00017
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International customers please contact us before ordering.

The Purifi 1ET400A is the next evolution in Class D audio. Ultra low distortion delivers clean audio even as the power output increases. The Purifi 1ET400A is capable of up to 450 watts of power output per channel (all channels driven) while delivering extremely low distortion performance and an ultra low noise floor level. Make no mistake, Purifi amplifiers are among the top tier of ALL measured and objectively reviewed amplifiers (including Class AB amps).
Our 2ch Purifi 1ET400A is the perfect amp for the discerning audiophile who wants the best possible 2ch music setup. You get the same performance as well known boutique brands at a fraction of the cost!

Custom I/O Board:

  • Neutrik XLR connectors
  • Gold plated 5-way speaker binding posts
  • OPA1612 Input Stage
  • TI TPS7A49/30 Voltage Regulators
  • Clipping Indication (via front power LED)
  • Error Indication (via front power LED)
  • Auto Sensing On/Off
  • 12v trigger On/Off
  • Muted soft-start/shutdown (minimizes speaker “pop” when turning on and off)
  • Low, Med, High Gain settings
Using I2C control of the Purifi modules through our Custom Input Buffer board allows us to offer features even some of the more expensive competitors are missing!

Gain Settings
  • 4 ohm - 25.5dB/2.2Vrms (High), 20.5dB/3.9Vrms (Medium), 15.5dB/6.9Vrms (Low)
  • 8 ohm - 25.5dB/2.3Vrms (High), 20.5dB/4.0Vrms (Medium), 15.5dB/7.1Vrms (Low)
High input gain setting matches up with the input gain of the Hypex NCxxxMP amplifiers, perfect for those wanting to mix Purifi amplifiers with Hypex amplifiers (such as for a home theater setup).

While our amplifiers use XLR inputs, it is perfectly fine (and fully supported by Purifi) for customers to use RCA to XLR cables to connect the amplifier to a source that only has RCA outputs.


  • (2) PURIFI 1ET400A module
  • (1) Hypex SMPS1200A400
  • High Input Impedance: 51K
  • Ultra High Damping Factor
  • High 25A Current Output
  • Idle losses ~1.7W (output stage)
  • Efficiency > 94%
  • Low Distortion: THD+N = 0.00017 % @ 100W, 4Ω, 20-20kHz
  • All aluminum case w/black powder coat finish
  • 10" wide x 13" deep x 3.5" high, 8lbs
Our cases may not be much to look at, but unlike our competitors who use overseas manufacturing, we have all of our cases manufactured in Nova Scotia, Canada (Protocase, Inc). This is part of our commitment to keep as much of our amplifiers as "home grown" as possible. It also ensures the highest possible quality aluminum and extremely precise CNC manufacturing.