Cambridge Audio Azur 851W Power Amp
Terrapin BufferingWhen designing a stereo system, listeners are often encouraged to think about system matching, where components are handpicked to provide the best overall sound quality. People often assume this is due to the different audio characteristics, but frequently it is due to impedance (the relationship between voltage and current input/output) matching components. Products perform at their optimum when their input and output impedances match. This isn’t always possible though so we decided to develop our unique Terrapin impedance buffering module. This enables the 851W to be paired with a huge variety of audio sources and pre-amplifiers of varying impedance without risking any sacrifice in musicality or overall audio performance.
Power & ControlTo build the 851W to be the best toroidal transformers were essential. But rather than use one for everything we designated one for the sound amplification itself, and another for the input circuitry. This means the signal is unaffected by audio output volume, so always sounds fantastic. The primary toroidal transformer provides unrestricted power to the dual mono amplification blocks. It’s a true audiophile transformer that will operate without distortion and with no buzz, interference or hum. The second smaller toroidal transformer takes care of pre-amplification processes.
Power output – stereo/mono: 200W per channel into 8 Ohms, 350W per channel into 4 Ohms Power output – bridged mono: 500W 8 Ohms, 800W 4 Ohms THD (unweighted): < 0.001% 1 kHz, < 0.005% 20 Hz - 20 kHz Frequency response: 5Hz – 80kHz S/N ratio (ref 1W / 8 Ohn): >90dB (unweighted) Sensitivity – stereo or mono: 1.5V rms unbalanced, 1.5 + 1.5V rms balanced Sensitivity – bridged mono: 0.775V rms unbalanced, 0.775V + 0.775V rms balanced Input impedances: Balanced input 38 kOhm, Unbalanced input 68 kOhm Power Amp damping factor: > 110 at 1 kHz Max. power consumption: 2400W Standby power consumption: Standby <0.5W Dimensions (H x W x D): 148 x 430 x 365mm (5.8 x 16.9 x 14.4”) Weight: 19.1kg (42.2lbs)