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.
All these features combine to create the supreme level of performance found in the Osiris and provide a perfect partner for our Isis CD player. We hope that you enjoy this product as much as we have enjoyed creating it.
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 Watt 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 400VA 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.
- Thermal cut out
- Electronic thermal DC protection
- Short Circuit Protection
- Galvanically isolated power supply
- Nichicon Audio Grade Capacitors
- Cascoded differential input
- Direct Input
- High Specification mains lead
- Custom aluminium Osiris remote control
|Power output||162 Watts per channel into 8ohm (Rated power output) 250 Watts per channel into 4ohm (max-power output)|
|Input sensitivity for 160 Watts into 8ohm Line input 1||250mV load 10K (transformer balanced)|
|Line inputs 2-5 and record||220mV load 22K|
|Direct input||220mV Load 50K|
|Amplifier gain: Direct input||44dB|
|Record output (with rated input level)||215mV into 100K|
|Frequency Response referenced to 160 Watts into 8ohm (all inputs)||10Hz (-1.7dB point) to 75KHz (-3dB point) 20Hz to 26KHz (-0.5dB points)|
|THD + Noise||Less than 0.05% (Bandwidth 22Hz to 30KHz|
|Power consumption at 160 Watts per channel into 8ohm||560W at 115/230V|
|Remote control||Phillips RC5 system number 16 audio pre amplifier|
|Mains Fuse 230v version||3.15A|
|Mains Fuse 115v version||6.3A|
|Osiris system remote batteries||AAA (1.5) x 2 (Supplied)|