PURIFI 1ET7040SA Monoblock, v2

Orders typically ship within 7-10 days
All amplifiers are individually assembled and tested to ensure the highest quality and performance.
$895.00Buy Now
  • 950 watts @ 2 ohm
  • 500 watts @ 4 ohm
  • 250 watts @ 8 ohm
  • S/N: 129dB
  • FR: 20 - 20KHz
  • THD: 0.00035
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International customers please contact us before ordering.

The Purifi 1ET7040SA is the big brother of the highly regarded 1ET400A. While the 4 and 8 ohm output is nearly identical to the Purifi 1ET400A, the 1ET7040SA shines for those with sub 4 ohm speaker loads (40A peak current capability vs. 25A peak of the 1ET400A). The Purifi 1ET7040SA is capable of up to 950w of power while maintaining extremely low distortion and noise floor levels.
A pair of our 1ET7040SA Monoblocks are perfect for stereo setups with extremely demanding speakers and/or serious full range usage. Pick up a trio for the ultimate Front LCR soundstage.

VERSION 2 UPDATE: We have updated our 1ET7040SA Mono amplifier to now use a Micro Audio SMPS (model SMPS1k-PFCR2). Compared to our previous v1 model using a Hypex SMPS1200A400, the new v2 model using the Micro Audio SMPS is able to drive the Purifi 1ET7040SA module to full rated power output, unlike most of our competitors.
We also offer installation of an optional add-on PCB board populated with extra capacitors (4x10000uF) from Micro Audio. This board does not alter/enhance sound or playback. Instead, it is meant as an option for those who will be running Full Range speakers (with or without a subwoofer) to prevent possible voltage dips. Please Contact Us if you are unsure about the need for this add-on.

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/2.4Vrms (High), 20.5dB/4.2Vrms (Medium), 15.5dB/7.5Vrms (Low)
  • 8 ohm - 25.5dB/2.4Vrms (High), 20.5dB/4.2Vrms (Medium), 15.5dB/7.5Vrms (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.


  • (1) Purifi 1ET7040SA module
  • (1) Micro Audio SMPS1k-PFCR2 (w/Active Power Factor Correction)
  • High Input Impedance: 51K
  • Ultra High Damping Factor
  • Ultra High 40A Current Output
  • Idle losses (output stage) ~2.8 W
  • Efficiency > 94%
  • Low Distortion: THD+N = 0.00035 % @ 200W, 4Ω, 1kHz
  • All aluminum case w/black powder coat finish
  • 10" wide x 13" deep x 3.5" high, 6lbs
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.