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REGA Osiris Integrated Amplifier

Regular price $11,295.00 USD
Regular price Sale price $11,295.00 USD
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Integrated Amplifier

The Osiris is the culmination of 32 years experience in solid-state amplifier development. A no compromise, super high performance, 162 W into 8 Ω (250 W, 4 Ω), dual mono amplifier housed in a custom Rega CNC machined aluminium case.



Rega’s flagship integrated amplifier

Designed around “minimalist” high gain power amplifier and “passive pre-amplifier” circuit topology, a passive volume control and a single stage of power amplification between the input and the speakers, the Osiris offers unrivalled performance and build quality. The Osiris is designed as the perfect partner for the rest of the reference range, such as the Isis CDP, Valve Isis CDP and Aura MC phono stage.



  • 162 W per channel into 8 Ω
  • 4 line inputs
  • 1 balanced input via XLR
  • Reference CNC remote handset
  • Direct input
  • Record out
  • Reference mains power lead
  • Lifetime warranty against manufacture defects



The Osiris uses a low distortion high linearity and a bandwidth common base voltage amplifier driver stage. This type of symmetrical circuit topology will provide the necessary voltage swings to enable the Osiris to drive any speaker system with the minimum of distortion. Eight Sanken 200 W output transistors are used in a “triple” high current output stage enabling the Osiris to drive even the most awkward of speaker systems with ease. The cascoded differential input amplifier uses two low noise LED referenced current generators. The open & closed loop feedback levels and gain bandwidth product components are optimised to give a tight and controlled sound stage, especially at the low frequency end of the audio range. Nichicon audio grade capacitors are used in bypass and de-coupling positions. Electrolytic capacitors have been bypassed with polyester capacitors where necessary, improving on the HF performance. Low inductance film SM power resistors are used in the output stage.


The Osiris uses two low noise, purpose designed 400 VA toroidal transformers using high-grade, fully bonded core material. The transformers are mounted to the chassis using Rega’s innovative mounting technique which eliminates noise being transferred from the transformer to the case when the transformers are operating under arduous mains (line) conditions with high levels of asymmetric mains (line) distortion. These transformers combined with 40,000 Micro Farads of Rega K-Power smoothing capacitors per channel, provide more than enough current to drive the hardest of loads. All the power supplies utilise fast recovery rectifier diodes throughout. (Fast diodes generate less high frequency switching noise therefore giving rise to a cleaner DC). The input and low-level driver stages are fed from a regulated symmetrical tracking power supply with a low noise voltage reference, which provides a fully stabilised low noise voltage, ensuring the highest level of sonic purity. All the dedicated audio power supplies feed only the audio circuits. The input switching, display & micro controller and protection circuits have their own dedicated supplies, keeping the audio signal path as pure as possible.





Rega Isis CD Player & Osiris Integrated Amplifier (Playback, from TAS 213) - Read More

"For my part, I’ve purchased the review samples, partly because they’re a delight to listen to, but also because they are powerful reviewing tools that shed plenty of light on ancillary components with which they are used. But frankly, you should not be unduly influenced by my purchase decision, since we all must make our own choices in this game. Instead, my only hope is that this review will inspire you to go out and give the Isis and Osiris a careful and open-minded listen, and then to draw your own conclusions. Whether you decide to embrace the Isis and Osiris or not, I’m confident you’ll find their performance eye-opening, to say the very least." - Chris Martens


Rega Isis and Osiris review - Read More

";;Isis; A magnificently musical CD player at a realistic price, with the addition of a USB input that many will find useful. Only the remote handset gives rise to criticism ;;Osiris; Beautifully built and finished, this very solid all-round performer has massive power reserves, splendid stereo imaging and a smooth, well controlled sound" - Paul Messenger





Power Output


162 W per channel in to 8 Ω


Input Sensitivity


160 W into 8 Ω, 250 W into 4 Ω



44 dB

Record Output 215 mV into 100 k
Frequency Response
10 Hz (-1.7 dB point)
THD & Noise Less than 0.05%
Power Consumption 560 W at 1125/230 V
Dimensions (W x H x D) 434 x 122 x 350 mm
Weight 25.6 kg