Arcam’s A49 integrated amplifier represents the pinnacle of Arcam’s audio engineering. We set out to incorporate everything we have learnt in almost 40 years to deliver an amplifier that will set new standards and provide class-leading sound quality for the best possible reproduction of your music.
Drawing on the many years of amplifier design experience at Arcam, the A49 uses the best quality components and engineering practice to produce a product that will give many years of musical pleasure and reliable service. With a class G amplifier, toroidal based power supply, acoustically damped chassis, paralleled transistor output stages and exceptionally low levels of distortion and noise the A49 is capable of reproducing music with all its original authority and detail. The A49 features dual mono volume controls and a balanced signal path all the way though the product together with distortion nulling input multiplexers. Rest assured you will hear the music just as the artist intended. The A49 has been designed to leapfrog the competition with a massive 200 watts per channel into 8 ohms and 400 into 4 ohms. It delivers 50 watts in pure class A mode while allowing for huge extra power reserves from our latest generation Class G topology that is both clever and efficient. During normal operation, distortion is measured in less than one part per million so that this massive power delivering total control and finesse. There have been great strides made in improving audio sources and loudspeakers in recent years and the time is right to match them in the field of amplifier design. This groundbreaking amplifier is a must audition amplifier for music lovers who understand that power is nothing without control.
Class G operation is a way around the traditional problem of switching distortion. In a normal push-pull Class AB amplifier circuit, a transistor only conducts half (180°) of the signal waveform, leaving the paired transistor to cover the other half. The point where the two switch between one another is plagued by non-linearites, causing distortion intrusive to the human ear. That’s why many high-end amplifiers run in Class A, keeping the output transistors constantly powered up – it gives lower distortion, but produces heat.
Arcam turns off the non-conducting transistor more slowly than in normal designs, using a mix of positive and negative feedback in the output stage. The output stage’s supply rail voltages are varied according to the signal level; it uses multiple power supplies rather than just a single one, gradually bringing in the secondary supply as the dynamic load demands it. This means it operates in near Class A mode at low levels, but goes much louder in Class B when needed. This offers a cool-running amp that sounds similar to a Class A design at real-world volumes.
Continuous power output, per channel, 8Ω
- Both channels driven, 8Ω,20Hz-20kHz, 0.2% THD - 200W
- Single, 4Ω, at 1kHz - 400W
Inputs - Phono (MM) cartridge
- Input sensitivity at 1kHz - 5mV
- Input impedance - 47kΩ +100pF
- Frequency response (ref. RIAA curve) - 20Hz-20kHz +/- 1dB
- Signal/noise ratio (Awtd) 50W, ref. 5mV input - 80dB
- Overload margin, 5mV at 1kHz - 20dB
- Power consumption (standby) - <0.5W
- Nominal sensitivity - 1V (RCA), 2V (XLR)
- Input impedance - 10kΩ
- Maximum input - 8V (RCA), 15V (XLR)
- Frequency response 20Hz-20kHz +/- 0.05dB
- Signal/noise ratio (Awtd) 50W, ref 1V/2V input - 105dB
- Nominal output level - 1.15V (RCA), 2.3V (XLR)
- Output impedance - 47Ω (RCA), 200Ω (XLR)
- Maximum output level into 600Ω - 4Vrms
- Output impedance - 1Ω
- Load range - 16Ω-2kΩ
Dimensions & Weights
- W x D (inc. speaker terminals) x H (inc. feet) - 433 x 425 x 171mm
- Weight (net) - 19.7kg
- Weight (packed) - 21.4kg