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2 channels power amplifier
Audio sense: automatic on/off switching
Switch settable gain
Purifi Eigentakt technology
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Purifi Eigentakt technology
For Arthur 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 Arthur 4215/E2, the amplification stage can deliver up to 210 W in 8 Ω and 450 W in 2 Ω
Input buffer with boXem sauce
Arthur 4215/E2 input buffer board was designed in-house. The challenge has been to fit in a relatively limited space the buffer circuits for two channels, the gain management switch, the audio sense circuit, the I2C bus communication with the amplifiers and finally the supplies for analog and digital circuits, all this while obtaining the performance at the same level as the amplification modules. OPA1656 op-amps were chosen because of their immaculate performance and the extremely low DC offset allowed by their architecture.
Three levels gain setting
A switch on the rear of the amplifier allows you to set three different levels of gain. Depending on the output capability of your source (pre-amplifier 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. High gain is optimized for sources outputting 2V, medium for 4V, low for gear able to provide 10 V.
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.
Beautiful chassis, attractive finish
The full aluminum custom chassis is not only nice looking, it dissipates the heat of the amplification module. No screws are visible from front, top and sides. The front plate is machined in an aluminum block and spray painted with different colors that can be chosen while ordering. The top and sides cover is a single piece finished with a special paint, with a mate, suede-like texture providing a very qualitative look and feel.
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.
A full set of fault diagnostics allows to protect the amplifier and your speakers against abnormalities.
Designed and proudly built in Luxembourg
Arthur 4215/E2 was designed and is assembled at Schifflange, Luxembourg, at the heart of Europe.
- Max power in 8 Ω
- 210 W per channel
- THD+N at 1 W
- below 0.001 %
- SNR at max power
- typ. 127 / 125 / 123 dB
- Output noise
- typ. 17 / 22 / 28 uV
- Frequency response
- 0 - 60 kHz +0/-3 dB
- 12.8 / 20.8 / 27.2 dB
- Minimal load
- below 2 Ohm
- Input type
- Input sensitivity 8 Ohm
- 9.4 / 3.74 / 1.79 V
- Standby consumption
- below 0.5 W
- Dimensions L x H x D
- 224 x 80 x 318 mm
- Mains cable
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