RPX-303 discontinued

RPX-303 is a full balanced quad mono amplifier dedicated to high demanding audiophiles, made by two independent dualmono solid state A-Class amplification units, with double power supply. It has a unique 4-section high quality potentiometer in order to make simple the use and the reaching of the desired volume.

RPX-303 is a pure Class A amplifier, working both in balanced or unbalanced mode either in input and output, or in any combination of them. The high current output, the absolute zero negative feedback (local or global) and the great capability of controlling the transducers make RPX-303 an astonishingly transparent and dynamic amp.

The double dualmono topology ensures the deepest and more natural head-stage. The oversized four section power supply ensures more than needed clean current, the enclosed transformers ensure no EMI roaming around the amplifier, hence no hum or buzz.

What to expect from its sound? Well the feeling of sound deepness, along with the sound coming with incredible dynamics from a pure black background, in a correct linear reproduction, is the best way to describe the performance of the RPX-303, that improves the already top notch performance of the 300 — sure it will surpass the most exquisite demands of the more refined audiophiles.

Like its predecessor RPX-300, the RPX-303 has a double pre-out connection (balanced and unbalanced) — a top unit like this becomes an unbeatable preamplifier for power units driving speakers.

RPX 303 operative modes

• Balanced Input to Single Ended Output
• Balanced Input to Balanced Output (full Balanced mode)
• Unbalanced Input to Balanced Output (through an internal phase splitter)
• Unbalanced Input to Unbalanced Output (traditional SE dualmono amplifier)

Headphone outputs

• Balanced left and right
• 2 × 6.4mm jack (unbalanced out)
• All the outputs can be used at same time

Preamplifier output (standard): Balanced Out XLR, Unbalanced Out R-L RCA. The set of output sockets can be configured to be controlled by the volume knob, making the RPX-303 a great preamplifier.

The RPX-303 comes from the research done at RudiStor R&D labs and uses only discrete components — four independent high current power amplifiers based on bipolar transistors, working two per channel with separated power supplies, and zero negative feedback. Some real no compromise solutions.

This product is made in Europe in respect of CE regulations by professionals and qualified laboratories under supervision of RudiStor R&D LABS

Price (2011): US $2,500 worldwide (free worldwide shipment included) / €1,990 in the EU (VAT included, free Europe shipment).