We are proud to present AUDIOPHONICS AP300-M400ET,  a class D mono power amplifier based a PURIFI 1ET400A module. This ready-to-use version is designed for audiophiles needing a foolproof amplification solution, with a considerable power reserve as well as impeccable linearity. The PURIFI module is indeed among the most rigorous Class D amplification solutions on the market, with simply exceptional measured performance.

This device offers high level sound reproduction which will be suitable to drive demanding speakers, to sonorize large listening rooms or for studio applications requiring a considerable headroom without compromising on the precision and richness of the audio message.

All of the components are integrated in a sober and robust 100% Aluminum housing with openings and heatsinks to help heat dissipation. Its design also allows it to block signal interference.

• The output noise is negligible, which allows deep silences and prevents losing details when listening at low volume.
• The circuit benefits from a high level of rejection (PSRR) which minimizes the impact of power supply on audio performance.
• Load-invariant frequency response and negligible output impedance enables the AP300-M400ET to drive the most demanding speakers with ease.
• Very low idle losses and reduced electromagnetic interference (EMI). The High loop gain allows relaxed timing of the power MOSFETs without degrading audio performance
• The AP300-M400ET interfaces its amplifier module with a custom module specially developed for its optimal integration.

Audiophonics Interface Card

The amplifier module Purifi is driven by a controller module of our design. 

A Texas Instrument LM4562 OPA per channel is used, these are very low distortion AOPs offering the greatest transparency with a very low THD. They are mounted on socket allowing their replacement if necessary

To suit all applications, we've opted for four gain settings, switchable via jumper on the underside of the unit.

Connectivity

Designed for easy integration, the AP300-M400ET has balanced (XLR) and unbalanced (RCA) mono inputs. A bipolar selector switch makes it easy to change the input source.

On the output side, a pair of BP-207 carbon gold 24K Ø5.5mm insulated terminal blocks provide an excellent connection to loudspeakers and support bare cables (5.4mm), banana plugs and forks.

THD+N

Frequency response

THD vs Freq