Audio Bricks: 400 Watts of Hi-fidelity Audio in a Compact Module

Audio Bricks

Designed by a team that includes Lars Press Petersen and Anaview founder Patrik Boström, Audio Bricks’ components are designed to be compact yet versatile and long-lasting.

The Engine-400 and AUX-plant are built upon a unique design philosophy, with the modules stripped-down to allow the user greater freedom in implementing only those features that are crucial to their design.

The Engine-400 is a super compact class D amplifier, while the AUX-plant is a small and highly versatile DC/DC converter that can be used to supply many different class D amplifiers with supplies for op-amps and gate drivers.

These Audio Bricks modules are designed to make the perfect pairing.



Electrolytic capacitors, input stages, supervision/control and even the output filter capacitors are excluded from the modules, providing the audio designer with many possibilities.


A small footprint and very low power consumption mean that Audio Bricks components can be used in a multitude of applications.


Bandwidth: 100kHz
Noise: 25μVrms
Dynamic range: 124dB
THD+N: 0.003%
Max phase shift: 17°

Flexibility and Long Life with the Engine-400

The Engine-400 is a super compact class D amplifier, capable of delivering high quality audio and 400Wrms into 4Ω or up to 300Wrms into 8Ω.

The module is based on the patent pending Sierra modulation design, which allows for constant loop gain in the audio band while still maintaining a first order closed loop response. This is what gives the amplifier very low distortion, and low phase shift, even at high frequency.

The customer selects which electrolytics, filter capacitors, VA+/- and VDR regulators to add to the module, according to design and/or preference. Please visit our Audio Bricks page to further examine the Engine-400’s impressive technical specifications.

Tech Tip

Comparing headline specification does not reveal the character of an amplifier, and so more advanced testing is required to reveal artifacts and subtle non-linearities. The modules perform exceptionally well with these advanced audio tests, so you can be assured that there are no nasty surprises with Audio Bricks:

CCIF is a twin tone measurement where the difference is measured, usually between 18kHz and 19kHz i.e. at 1kHz. This reveals how good the linearity is at high frequencies. Since Engine-400 has the same loop gain in the entire audio band this measurement looks similar to the THD-measurement.


DIM30 is a way of trying to reveal if there are internal saturations in cascaded gain stages when exposed to high slew rate signals. It is tested by generating a large slew limited 3.15kHz square wave and then adding a smaller 15kHz sine wave on top (pretty much like music can be when a drum is hit at the same time as a trumpet is playing).

Engine-400 shows good behaviour with this challenging signal and it looks similar to the THD vs power graph.


Audio Bricks graph

View our range of Audio Bricks modules