boXem - A 4215/E2
  • boXem - A 4215/E2
  • boXem - A 4215/E2
  • boXem - A 4215/E2
  • boXem - A 4215/E2

A 4215/E2


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Stereo power amplifier
Unique top down cooling concept
Audio sense: automatic on/off switching
Switch settable gain
Purifi 1ET400A power stage

A question? Don't hesitate to contact us!

Input and gain stage: boXem stage II
Output connectors: Binding posts
Mains voltage: 180-264V
Built to order - Shipped within two weeks

Purifi Eigentakt technology

For the A 4215/E2 we have chosen to implement the Purifi Eigentakt technology. Purifi is the first company to have managed to build a mathematically exact model for self-oscillating amplifiers. This innovation enables a complete optimization of the amplification circuits improving the performance by an order of magnitude over existing implementations.

In more musical terms:
- Highly resolved and stable stereo image across the whole spectrum, even during very complex and busy passages thanks to the negligible inter-modulation distortion (IMD).
- A total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style due to the extremely low THD at any frequency and any power level.
- Difficult loudspeakers are handled with ease, including those that challenge most other amplifiers because of the load-invariant frequency response and negligible output impedance.
- The smallest amount of audible artifacts when pushed into clipping or overload is guaranteed by an exceptionally clean clipping and clipping-recovery in both voltage and current domains.

In the boXem A 4215/E2, the amplification stage can deliver up to 210 W in 8 Ω and 420 W in 4 Ω

Top-down cooling concept

In most class D amplifiers, the heat sources are installed at the bottom of the amplifier, relying mainly on conduction to evacuate the heat generated by the power stage. While, pending enough conduction support is provided, this concept is acceptable until a couple hundreds Watt, it becomes limited for higher power values. Unique in this price range, our chassis allows the electronics to be installed top down in order to benefit as much as possible from the natural convection in addition to keeping it's conduction properties.
This allows better sustained performance, better durability (capacitors do not age well when overheated) and higher ambient temperatures (looking at you, closed cabinet owners).

Input and gain buffer with integrated EMI filtering

The boXem A 4215/E2 offers the boXem stage II input and gain buffer that integrates EMI filtering to prevent disturbances from the modern electronics surrounding our interiors.

Two levels gain setting

A switch on the rear of the amplifier allows you to set two different levels of gain. Depending on the output capability of your source (pre-amplifier, processor or DAC with volume control) the system gain structure can be optimized for two main targets.
The first is to have the lowest noise, the second the smoothest volume setting as possible.
While the noise levels of modern audio gear has become so low that noise optimization for home audio is often purely academic, having a smooth volume control is something we find so enjoyable that it was our main motivation for integrating the gain control switch.

Listen to the music, forget the electronics

Plug your audio source (with volume control), your speakers, the mains cable, switch on the mains, and forget your amplifier. The automatic on/off function detects the presence of sound at the input and automatically powers on the amplifier. After 10 minutes without sound at the input, the amplifier sets itself in standby, allowing an ultra-low power consumption when not in use.
If you are equipped with electronics featuring a trigger function, a 12V trigger input is also available.

Fully protected

A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities.

Designed and proudly built in Luxembourg

The boXem A 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.


Data sheet

Max power
210/420/450 W in 8/4/2 Ω
THD+N at 1 W
below 0.001 %
SNR at max power
Output noise
Frequency response
0 - 75 kHz +0/-3 dB
24.3/30.5 dB
Minimal load
below 2 Ohm
Input type
Input sensitivity 8 Ohm
1.3/2.6 V
Dimensions L x H x D
233 x 87 x 299 mm (+ 20 mm for WBT 708)
Power stage(s)
Purifi 1ET400A
Power supply
Hypex SMPS1200
4,6 kg
Mains cable

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