Evolution 50A Integrated Amplifier
This new amplifier forms part of the next generation EVOLUTION 50 range of products. Housed in a slim case with engraved front panel and solid control knobs, its finished in either black or silver brushed aluminum. An ingenious new push button design has been developed for it, offering excellent tactile feel and backlit optical indication of usable functions for optimum user-friendliness.
This is Creeks first product to feature an OLED (Organic Light Emitting Diode) display. This white on black display provides higher clarity and resolution than a normal display. Brightness levels can be changed or the display made to turn off when not required, via the menu system.
At the heart of any good amplifier lies a good power supply; The EVOLUTION 50A uses a 200 Watt toroidal mains transformer with separate windings for high and low current analogue and digital circuitry. This solution produces a good power to weight ratio and low magnetic interference. Creeks policy of paralleling several low impedance capacitors to create an ultra-high specification capacitor to smooth the DC also helps to produce a very powerful and accurate sound from such a relatively small amplifier.
A completely new bi-polar transistor power amplifier circuit was designed especially for the EVOLUTION 50A with very high open-loop gain and low distortion. Featuring a pair of Sanken 15Amp power transistors, with built-in thermal compensation for rapid bias tracking performance, the Power Amplifier circuit has very low output impedance and can produce high output current. This combination will provide exceptional speed and control over most loudspeakers.
Also developed was a completely new analogue Pre-amp circuit, providing high levels of flexibility and control, via unbalanced or balanced inputs. It has multiple input options, switched electronically or via gold contact relays, plus electronic Volume, Balance and Tone controls. For Vinyl fans, a Sequel Phono pre-amp can be plugged-in, substituting Line Input 1 for Phono. In addition, there is another input available, should the user want to fit a Tuner module. The computer control will sense this and respond accordingly.
Excellent measured and sonic performance has been achieved with this analogue integrated amp, but when using digital input signals via the matching EVOLUTION 50D CD/DAC/Pre-amp, the analogue pre-amp can be bypassed completely. The EVOLUTION 50D CD/DAC/Pre-amp has a very high-end volume control in the digital domain and Class-A balanced audio outputs. Connecting the output directly to the Power amp direct inputs elevates the performance to an even higher level.
Evolution 50A Specifications:
- Power Output: >55 Watts into 8 ohms, >85 Watts into 4 ohms
- Continuous Current: >8.5 Amps (sine wave)
- Max Current: >26 Amps, current burst into 0.5 Ohms
- Output Impedance: <0.1 Ohms @ 1Khz
- THD: < 0.005% 20Hz – 20Khz
- SNR: >102dB
- Frequency Response: 10Hz – 100KHz +/- 2dB Line
- Gain: 33.3dB (x46) via power amp input
- Input Sensitivity: 410mV
- Crosstalk: -80dB at 1Khz
- DC Offest: < +/ 10mV
- Slew Rate: > 30 V per μS
- Pre-Amp Inputs: 5x RCA unbalanced – 1x Balanced XLR
- Power-Amp Inputs: Input 3 & 4 via RCA or XLR
- Outputs: 1 Pair
- Headphone Output: Dedicated low impedance amp (<50 Ohms)
- IR Bus: Powered output for IR repeater
- Operating Voltages: 110V/230V Switchable
- Consumption (At Idle): <20 Watts
- Consumption (At Full Power): 350 Watts
- Weight: 7.5Kgs
- Dimensions: 430x60x280mm W/H/D