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Audiolab 6000A Integrated Amplifier

Integrated Amplifier

An amplifier remains the beating heart of any high-performance audio system, but in 2018 a truly versatile integrated amp needs to cover many bases – digital and analogue sources, wireless connectivity for portable devices, a phono stage to cater for vinyl playback, amplification for headphones as well as speakers… That’s a lot to pack in, whilst keeping performance high and the price tag affordable – and yet, that’s exactly what the 6000A delivers.

Digital circuitry

Much effort has been made to ensure the 6000A’s digital circuitry delivers the level of quality one might expect of a high-performance standalone DAC. As ever, Audiolab has turned to the ES9018 Sabre32 Reference chip family to perform D/A conversion, utilising ESS Technology’s 32-bit HyperStream architecture and Time Domain Jitter Eliminator to deliver ultra-low noise and high dynamic range.

Analogue circuitry

The 6000A’s discrete Class AB power amp stage delivers 50W per channel into eight ohms, with a maximum current delivery of 9 Amps into difficult loads. The output stage of the discrete power amp circuits uses a CFB (Complementary Feedback) topology, ensuring superior linearity and excellent thermal stability, as the idle current is kept independent of the temperature of the output transistors.
A substantial 200VA toroidal transformer, followed by 4x15000uF reservoir capacity (60000uF in total), helps the amp to maintain firm control of the music whilst enabling excellent dynamic range.

The preamp section is kept as simple as possible to maintain signal purity, with line input signals passing to a precision analogue volume stage. The latter covers the range from -80dB to +8dB in steps of 2dB and 1dB (step resolution increases with volume position). Much effort has gone into the physical layout of the 6000A’s circuitry, protecting the sensitive preamp section from noise interference.

Audiolab 6000A Specs:

Gain (max.):
- +8dB (Line)
- +55dB (Phono MM)
Input Sensitivity:
- 720mV (Line, Volume = 0dB)
- 3.1mV (Phono MM, Volume=0dB)
Input Impedance:
- 10K (Line)
- 47K//100pF (Phono MM)
Total Harmonic Distortion (THD):< 0.0004% (Line, 1KHz @ 2V, Volume = 0dB)
Frequency Response: 20Hz-20kHz (+/-0.1dB)
Output Voltage: 2.3V max. (Volume = 0dB)
Output Impedance: 120Ω
Signal-to-Noise Ration (S/N):
- > 110dB (Line, A-weighted)
- >76dB (Phono MM, A-weighted)
DAC:
- D to A converter: ES9018K2M
- Total Harmonic Distortion (THD): < 0.0006% (1kHz @ 0dBFS)
- Output level (0dBFS, 1KHz): 2.05V
- Max. Sampling Frequency: 192kHz
- Signal-to-noise ratio (S/N): > 112dB (A-weighted)
- Digital Filters: Fast Roll-off , Slow Roll-off , Minimum Phase
Power Amplifier Section:
- Gain: +29dB
- Rated Max. Power Output: 2 X 50W (8Ω, THD<1%) 2 X 75W (4Ω, THD<1%)
- Frequency Response: 20Hz-20kHz (+/-0.3dB)
- Input Sensitivity: 720mV
- Total Harmonic Distortion (THD): <0.003% (1kHz @ 40W/8Ω)
- Signal-to-Noise ratio (S/N): > 110dB (A-weighted)
- Max. Output Current: 9A
Headphone Amplifier:
- Total Harmonic Distortion (THD): < 0.01% (1kHz, 50mW)
- Output Impedance: 2.35Ω
- Load impedance: 20-600Ω

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