Naim Audio NAC552 Preamplifier

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Naim Audio


Type: Amplifiers


Naim NAC552 Preamplifier

Many designs were explored and a complete evaluation of the current component and raw material situation took place. The circuit topology was totally reviewed and components upgraded in accordance with the advancements made over the last decade. Extensive listening to various designs and topologies ensured that the harmony between music and technology was maintained.

Power supply design has always been at the heart of Naim research and this project was no exception. For the NAC 552 a radical new split rail power supply configuration has been employed that almost eliminates power supply noise in the signal earth. Housed in a separate, full-width brushed aluminium case, the power supply features a massive 800 VA toroidal transformer, three enormous smoothing capacitors and fourteen hand-selected power regulators to supply independently the different stages of the preamplifier.

As pioneered in the Naim CDS compact disc player, fully suspended sub-chassis mounted circuit boards are used in the Naim NAC 552. This method of suspension maximises isolation, hence minimizing the effect of vibration on the highly sensitive electronic components. Carefully selected precision rotary potentiometers with precious metal wipers are used to preserve music integrity and ensure long-term stability. Six inputs on the NAC 552 can be selected directly from either the front panel or the remote control. In addition to the usual DIN inputs, preferred for their superior earthing and impedance matching, the NAC 552 owner can configure two of the inputs for use with the more common RCA phono type connectors, enabling the use of alternative components with pre-owned interconnects. Each of the six inputs has separate listen and record facilities. A dedicated unity gain input is provided for use with the Naim AV2 processor or similar.

The Naim NAC 552 redefines the state of the art ensuring the utmost musical enjoyment for many years to come.

 
AUDIO INPUTS
Analogue Inputs 7 x DIN, 2 x RCA
Input Sensitivity 75mV
Input Impedance 47kΩ
Other Inputs Two inputs configurable for unity gain
AUDIO OUTPUTS
Analogue Outputs 1 x variable, 3 x fixed (DIN)
Line Outputs Fixed (level) 75mV, 600Ω
Line Outputs Variable (level) 775mV
Output Impedance <50Ω
Load Impedance 10kΩ (min.)
Power Outputs Naim phono amplifier
CONNECTIVITY
Remote Control Infra Red (RC5)
Remote Input RCA on rear (RC5)
POWER
Supply Voltage +/-12V, 24V, 32V
Power Supply Options 552PS
PHYSICAL
Dimensions 87 x 432 x 314mm (H x W x D)
Weight 12.9kg
Shipping Dimensions 240 x 590 x 500mm (H x W x D)
Shipping Weight 14.6kg
FINISH
Front Brushed and black anodised
Case Brushed and black anodised



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