Naim NAP 500DR Power Amplifier
In common with the flagship Naim Statement power amplifier, the NAP 300DR is a multi-chassis amplifier. Two part in this case, one box containing the audio amplifier and the second housing the power supply.
To avoid the compromises implied by the use of multiple sets of output devices, either in totem-pole or parallel configuration, the search was on for a very special output transistor. A bipolar transistor with a specific combination of very high current, power rating and bandwidth was needed, far in excess of anything available to Naim before. A suitable output device was eventually developed after six years' collaboration with a semiconductor manufacturer. Further recent developement for the Statement amplifier has led to a new output device, the "NA009" designed for ultimate sound quality.
From an early stage of conception it was decided to use bridged amplifiers for each channel of the NAP 500DR. This allowed the design to have maximised open and closed loop speed, less intrusive protection circuitry and reduced interaction between input and output signals as the very high drive currents to the loudspeaker do not flow through the system earth.
Naim has always understood the importance of reducing supply-induced intermodulation distortions and mains harmonic electrical noise from an amplifier, and has always used regulated supplies in its premier amplifiers. It was considered likely that improvements in these areas would yield further large gains in performance. Each channel of the NAP 500DR includes multiple stages of local regulation utilising new Discrete Regulator technology to massively lower the noise floor compared to the original model.
To further reduce interference from the mains supply, the transformer and first stages of the power supply are in a separate enclosure (the same size as a SuperCap), which provides twelve raw D.C. supplies for the power amplifier. Hence, the NAP 500DR system consists of two boxes, a stereo amplifier and a separate power supply.
All new circuit topology has been developed to maximise bandwidth and reduce distortions and power supply dependency. Also, special attention has been paid to reducing thermally-induced noise, an especially important consideration in power amplifiers. A variable speed intelligent fan system provides discreet extra cooling if needed.
These two new technologies, combined with other small improvements to layout and componentry, mean the NAP 500 DR noiw produces even more of the fundamental musical pace, rhythm and timing that Naim are world famous for.
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Audio Inputs
Input Impedance: 18kO
Analogue Input: 2 x XLR
Audio Outputs
Minimum Load Impedance: 2O
Frequency Response: -3dB at 1.5Hz and 100kHz
Gain: +30dB
Finish
Case: Brushed and black anodised
Front: Brushed and black anodised
Physical
Shipping Weight: 28.2 kg
Shipping Dimensions: 270 x 570 x 520 mm
Weight: 25 kg
Dimensions (HxWxD): 160 x 432 x 374 mm
Power
Mains Supply: 100V, 115V, 230V; 50 or 60Hz
Power Supply Options: 500PS
Speaker Outputs
Power Output: 140W/channel, 8O
Transient: 700VA
Speaker Outputs: L & R, 4mm “banana” sockets
Supplied with 500PS, Power-Line, Burndy