The latest integrated amplifier from Pioneer is based on the original Direct Energy concept and impresses with its newly developed Direct Energy Design, offering a high signal-to-noise ratio and an overwhelming, lifelike sound field. Features such as the isolated power supply, specially designed large capacitors, Direct function, Power Amp Direct circuit, volume control, and aluminum front panel, along with an MM phono input, ensure remarkably clear sound as intended by the artist.

Separate windings for the power amplifier, preamplifier, and controls in the power transformer prevent mutual interference. The main capacitor, which is crucial for the amplifier's audio quality, was developed in collaboration with ELNA. The Pioneer logo on the capacitor winding indicates that it is a pure audio capacitor. The Direct functions of the A-40AE allow for the bypassing of other circuits, except for the volume control. This finely tuned function enhances musicality for an optimal listening experience. The specially shaped "Anti Standing Wave" decoupling feet without parallel sides help to avoid resonance. They ensure precise sound localization and pure sound, while also contributing to a seamless connection between channels and improving performance with fast sounds.