Nord is an authorized partner of Purifi Audio and has collaborated with them for over 4 years. Learn more on Purifi’s site. All our amplifiers utilise Purifi’s cutting-edge technology EIGENTAKT. Known for its latest and most advanced modules. We design, construct, and directly sell a diverse range of amplifiers based on Purifi technology, including stereo and multichannel amplifiers.

We integrate a variety of Purifi modules, starting from the Purifi 1ET400A, 1ET7040SA and 1ET9040BA. Both 400 and 7040 use separate power supplies using the Hypex SMPS1200A400. They also use separate input buffers. Our standard amp uses a simple IC based OPA1612 buffer while ultimate performance is achieved by specifying it with our Nord Buffer, incorporating discrete Voltage Regulators and Op Amps. This method ensures superior performance and allows for easy upgrades to each section of the amplifier.

Lastly, the 1ET9040BA module also utilizes a separate Power Supply. While our standard 1ET940BA amplifiers use the onboard buffer, superior audiophile performance is achieved when specifying our Nord Buffer.

EIGENTAKT – LEARN ABOUT EIGENTAKT Ultra Linear and Robust Class D Amplifier Technology

The EIGENTAKT Class D Amplifier Technology from PURIFI is the result of extensive research and patented IP aimed at addressing persistent challenges in Class D technology. This innovative technology delivers ultra-linear and extraordinarily robust performance that meets the needs of audio developers and end-users alike. It enables system integrators to design and manufacture products that are top-of-the-line in terms of audio performance, industrial-level reliability, and cost-effectiveness.

Unlike traditional Class D technology, EIGENTAKT eliminates common stigmas such as “harsh sound” and “frail reliability”. This has been confirmed by objective measurements, subjective listening tests, and harsh robustness testing.

EIGENTAKT is available in multiple forms ranging from a line of drop-in Amplifier Modules to Amplifier Designs for Licensing by OEM’s.  At PURIFI, we are open to discussing custom or semi-custom EIGENTAKT Designs based on our IP.

What Makes EIGENTAKT So Special?

Firstly, we recommend that you experience EIGENTAKT with your ears by listening to your favorite music. No data sheet can fully convey the clarity, detail and enjoyment that EIGENTAKT offers during a listening session.

However, objective data sets are also essential to explore and compare when auditioning amplifier technologies. Hence, we strive to create detailed, accurate, and reliable data sheets with an abundance of relevant information. Please feel free to contact us directly if you find any missing information.

EIGENTAKT incorporates a comprehensive protection system that makes it tremendously robust and easy to integrate. Please refer to data sheet for details. 

Negligible THD & IMD

The patented EIGENTAKT ErrorCorrection IP ensures ultra-high loop gain (>75dB) in the entire audio band. This figure corresponds to an unprecedented 110MHz Gain-Bandwidth Product and produces consistent ultra-high performance across the audio spectrum unmatched by audio amplifiers of any technology or operating class.

Intermodulation Distortion (IMD) is a very good measure for how well an amplifier handles complex signals. Sonically low IMD means a highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages.

THD remains extremely low at any frequency and any power level right until clipping. This translates into a total lack of sonic signature, and an ability to reproduce any type of music without preference for genres or production style.

Negligible audible noise. Deep black silences and a generous and detailed sound even at very low playback volumes.

Load-invariant Frequency Response & Negligible Output Impedance

EIGENTAKT handles difficult loudspeakers with ease, including those that challenge most other amplifiers. The Frequency Response (FR) is very flat in the entire audio-band with a sensible 60kHz bandwidth. Variation between high-impedance and low-impedance loads is completely negligible as indicated by perfectly overlapping 2-ohm to “open-load” FR plots. 

Minimized sensitivity to out-of-band noise from DACs reduces requirements on the DAC reconstruction filter and enables possibility of a shorter signal path between DAC and loudspeaker (integrated products). The reduced sensitivity also ensures problem-free operation with outboard DACs over which you may have no control.

Output Impedance in the sub milli-ohm range resulting in a five-digit Damping Factor. 

Very low Idle Losses & Reduced Electromagnetic Interference (EMI)

EIGENTAKT ErrorCorrection allows relaxed timing of the power MOSFETs without degrading audio performance. This brings additional benefits in terms of very low Idle Losses and low Electromagnetic Interference (EMI).

The minimized Idle Losses combined with high Power Efficiency allows the EIGENTAKT technology to run cool even within constraint enclosure sizes and minimal heat sinking. EIGENTAKT is specified for continuous output power with a realistically implemented thermal system. 

Low Electromagnetic Interference (EMI) makes it convenient and easy to integrate EIGENTAKT modules at the system level. Typically, regulatory tests are passed with little to no effort needed.


Numbers Speak For Themselves!

0 +
Amplifiers Supplied
100 %
Returns per Year
0 %
Amps Shipped in 2 week Promise
Shopping Cart