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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

NAD DD AP-1 Reviews

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What's in the box?

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  • 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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Customer Q&A

1 question already asked

John, it's very easy. If you've ever replaced a sound or video card on a computer you can do this. Power down your 390, unplug the power cord for safety. Make sure you've discharged any static build up by touching metal to the case and don't work on carpet or any high static areas. After carefully removing the screws to the vacant slot cover on the 390, line up the AP-1 with the rails inside the 390 slot. Gently push the AP-1 in until it locks into place. You don't need to force it. The AP-1 should be flush with the case. Attach the two scores to hold the AP-1 in place. Connect your power cord, plug it in, turn on the 390, then cycle through your sources and you should see the AP-1 as a choice. It should be that easy. Power down again, connect your gear, power up, select your gear, and you should get music. [ JEFF  Dec 26, 2014 ]
It's pretty much just like installing any PCI board/sound card/adaptor in a PC motherboard. The only thing to watch out for (unless they've changed this) is a protective gold colored transparent tape covering the flat gold plated slot connector pins. It can be easily overlooked. Make sure you remove this tape before inserting the module. [ ARTHUR  Dec 23, 2014 ]
Very easy. Just unplug the unit. Remove the cover (it will only fit in the leftmost slot. Be careful to use the guide inside when sliding the card in. Ensure it is fully engaged in the slot and then screw in the cover plate. You should use an anti-static wrist strap. When you power back up, the three inputs appear. It's that easy. One thing to note. The phono input only operates at 44.1 kHz sampling which I found a little disappointing. The other line inputs can be adjusted in settings to 192 kHz. Having said that it sounds really good. I was pleased overall win the performance. [ Gary  Dec 23, 2014 ]

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