Analog/phono input module for the NAD C 390DD

Item #: 745DDAP1

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The NAD DD AP-1 Modular Design Construction (MDC) module is designed to complement your NAD C 390DD Direct Digital stereo integrated amplifier, and gives it the capability to handle three different analog audio inputs. It features one balanced XLR stereo input pair, one single-ended RCA stereo input pair, and a stereo RCA phono input, selectable between moving magnet or moving coil profiles. Internally, the module performs a 24-bit/192 kHz analog-to-digital conversion on the incoming audio source signals to prepare them for the C 390 DD's digital pathways. Adding this module will help your C 390DD to handle analog audio sources and turntable signals with ease, increasing its value and utility as the heart of your entertainment system.

Important note: The installation of MDC modules should be handled by an NAD authorized dealer or an authorized NAD service center. This is not intended to be a user installed accessory.

Product Highlights:

  • 3 analog audio inputs
    • balanced stereo XLR input
    • unbalanced RCA stereo input
    • stereo phono input for connecting a turntable, switchable between MM/MC
  • internal analog-to-digital conversion of source signals at 24-bit/192 kHz
  • auto input ranging keeps signals from clipping or overloading
  • class A input buffers
  • module should be installed by an NAD-authorized dealer or service center; not intended to be a user-installed accessory
  • warranty: 2 years
  • Our 60-day money-back guarantee
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Hands-on research

What's in the box?

Download owner's manual

  • Line/Phono upgrade module (for NAD C390DD)
  • 2 Screws

Product Research


Modular Design Construction: The advantages of a pure digital system are many, but one drawback is the constantly changing delivery formats for digital content. Each of these formats typically requires specialized hardware and software, often with licensed IP and content copy protection. For this reason, NAD places all digital interface circuitry on easily upgradable modules. NAD calls this 'Modular Design Construction' or 'MDC'.

DD AP-1 Analog Phono Module: The NAD DD AP-1 is an analog Line-level/Phono upgrade module for the NAD C 390DD direct digital integrated amplifier (745C390DD, sold separately). The DD AP-1 module features balanced stereo XLR inputs, unbalanced stereo RCA inputs, and a stereo Phono input. The NAD DD AP-1 module is very innovative, using super high quality Analog-to-Digital conversion to make analog sources compatible with the C 390DD's pure digital circuitry. Using 24-bit/192kHz processing, the ADC circuit auto-ranges for the best possible resolution and lowest noise. The phono circuit has impedance settings for both moving magnet (MM) and moving coil (MC) cartridges with gain automatically set. For the first time, RIAA equalization is performed completely in the digital domain using precision DSP filters. The result is far more accurate than even precision analog circuits and has the additional benefit of eliminating phase shift from the circuit.

Note: This module should be installed by a NAD-authorized dealer or service center; not intended to be a user-installed accessory.

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