DUSSUN R20 or the absolute top in the field of transistor mono amplifiers. High-end Audio Import BV provides them with a competitive price.

Please see specifications below and you will know probably enough as a connaisseur.


11.950,00 9.950,00 You Save: 17%


R20 are monaural amplifiers developed and handcrafted elaborately to re-render full music spirit and connotation, whose design reference benchmark is "State of Art Counterpart" to top Hi-end preamplifiers", for instance R10, in any terms of play-back, such as  performance, tone, function, construction and craftsmanship.

Born under the principle of uncompromising in terms of development, design, materials and components as well as craftsmanship and overall quality, these real hi-end machines combined with matching source-, pre-amplifying-, as well as speaker components deliver fantastic sound possessing outstanding quietness, rich details, dense timbre as well as transparent and spacious tone. They in this way escort each audience to rediscover the performing atmosphere and rich sound spatial information from those familiar CDs which perhaps was ever missed before.


The R20  beside others in its design offers the following highlights:

No Switch Distortion Amplifier Design

A truly balanced input topology eliminates the need for an input buffer amplification stage, allowing the first stage differential amplifier to be driven directly by the source. Matched impedances are presented to the source and both signals travel through identical circuit paths. Switch distortion does not exist at all.

With DUSSUN's adaptive bias technology, the R20 power amplifiers keep class A output even if the speakers' impedance goes down largely and due to that output power increased several times. This prevents from the traditional pure class A amplifiers' inevitable regret of returning to class B when the speaker load impedance drops down, and so is much close to the ideal class A amplifier.

Massive Power Supply

The R20's feature a 1200VA (1600VA at short time) low-noise toroidal transformer in a fully balanced power supply for both the amplifiers inverting and non-inverting halves. In addition, twelve 10,000UF low ESR capacitors are used.

Copper bus bars enhance the efficiency of power distribution within the amplifier and eliminate variances introduced by the wiring harnesses, etc. more commonly found even in high performance amplifiers.

High frequency power supply bypass is accomplished on individual boards by a total of 26 components of several film types. The resulting uniformly low power supply impedance seen by the various circuits within the R20 lays the foundation for both the massive power and the extraordinary finesse that characterizes this machine.

Fully Balanced Design

A truly balanced input topology eliminates the need for an input buffer amplification stage, allowing the first stage differential amplifier to be driven directly by the source. Matched impedances are presented to the source and both signals travel through identical circuit paths.

Meticulous attention to the layout of the amplifier, including careful mirror-imaging of circuits to cancel magnetic fields, essentially minimized magnetic field distortions that can occur with such a massive power delivery system. The input signal remains balanced, and rejection of common made noise and distortion is achieved in the loudspeaker s voice coil.

True Voltage Source

The R20 operates like a true voltage source maintaining the appropriate voltage at a given time (based on signal demands) without particular regard for the current demands of the associated loudspeakers.

48 output transistors distributed throughout the four main heat sinks conduct and control the flow of power to the associated loudspeakers.

12 complementary pairs of output transistors are used in both the inverting and non-inverting output stages.

No known high-quality loudspeaker can continuously absorb the full power of the R20, but many loudspeakers require these extreme bursts of power on a short-term basis when reproducing music at realistic levels. The R20 provides these short bursts without creating power supply sag or altering sonic performance. Its imperturbable nature is reflected in the authority and control with which it reproduces musical signals.

Extensive Protection

Protection from internal or external component failure is an integral feature of the DUSSUN design philosophy. The R20 employs several forms of protection, both for its own self-preservation as well as the protection of loudspeakers and other components to which it is connected.

The surge buffer helps to prevent damage from an occasional or prolonged influx of surges and spikes.

Over-drive protection circuits are used to prevent high-energy, high-frequency ringing artifacts from reaching and damaging loudspeakers if the amplifier is over-driven.

When the amplifier is over-driven for prolonged periods, or if a loudspeaker cable or output device has shorted, an over-driving protection circuit switches the amplifier off.

DC servos are used to correct for potentially damaging DC-offset. As with other DUSSUN components, the correction range is +1V. If the problem exceeds the servo's range, the amplifier will be switched off.


Regardless of the technology used, numerous details have to match for fully realizing the potential of this design. They, such as quality of individual components, the care and craftsmanship with which they are assembled and the exhaustive inspection and testing employed help raise the value of this product greatly.


No. of Inputs RCA:

No. of Inputs XLR balanced:

Trigger in:

Voltage Gain:

Rated Power Output:

Frequency Response:

THD + Noise:

S/N Ratio:


Power Supply:

Environment Temperature:




Shipping Weight:




26.5 dB

300 W at 8Ω, 600 W at 4 Ω over the 20 Hz to 20 kHz with no more than 0.1 THD

20Hz to 20 KHz ± 0.5dB

≤0.1% with 300 W on 8Ω, 600 W on 4 Ω both over full range 20 Hz to 20 kHz

≥ 102 dB, over full range 20 Hz to 20 kHz, A-weighted

No. 2 Speaker Output Groups, No. 1 trigger out

 A/C 110V/60Hz, 220±10 V / 50-60 Hz




233x468x475 mm, WxHxD

45 kg approx.


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