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How to setup DIRAC Calibration for NAD

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How to setup DIRAC Calibration for NAD

**Needed Supplies: **

 SPL Meter or SPL app on a smart device

 Tape Measure

 Windows or Mac Computer

 DIRAC Program from‐live/ for your

specific NAD product.** IMPORTANT: No other DIRAC software will work for your NAD product. **

 USB microphone dongle, mono to stereo minijack adapter and microphone (All supplied with your NAD product – 3rd party microphones can be used, this guide will not cover 3rd party products)

 Roughly 45 minutes of your time

Let’s Begin

1. Completely install your NAD product.

a. All speaker wires should be connected

b. All sources should be connected and configured

c. Connect the BluOS Kit included with your NAD product to the USB port near the rear HDMI ports.

d. Connect your NAD product to the network. A walkthrough of getting on the network can be found here:

**2. **Be sure to have the most up to date firmware. You can trigger a firmware update from he SYSTEM INFO page of the OSD:


**3. **Configure your Speakers

a. In the SPEAKER SETUP page of the OSD, set your SPEAKER TYPE and Crossover points. Small/80hz is the THX standard but check with your speaker manufacturer for their preferred settings. Be certain to turn off any channels not connected to speakers and won’t be used.

b. Using the Built in Test Tones, set your Speaker Levels using the SPL meter or the SPL app on your mobile device. Try to get all speakers as close to 75db as possible. Be sure to adjust subwoofer level using the Volume knob on your subwoofer instead of the receiver OSD.

c. Using the tape measure, measure the distances from the primary listening position to the speaker’s tweeter and input those distances in the Speaker Distance menu of the OSD.

4. DIRAC Microphone Dongle Assembly

a. Assemble the Microphone and USB dongle assembly as shown. Pro Tip: Be sure not to use too much force when inserting the mono to stereo mini‐jack adapter into the USB dongle. Later in the process, if the DIRAC program constantly gives “Level to Low” errors, pull the mono to stereo adapter ever so slightly out of the USB dongle to get a better connection.


a. Connect the USB dongle to the BluOS Kit/USB Port on the rear of your NAD product where shown below. Alternatively, you can connect the dongle and microphone assembly to your computer instead. Just be sure you know how to configure your computer’s microphone settings if need be. The dongle assembly must be connected before launching the DIRAC software or DIRAC won’t see the mic.


5. Calibration Process

a. System Config Tab

i. Launch the DIRAC app on your computer. It should automatically find your NAD product on your network. If it doesn’t, make sure all firewall and virus protection software on your computer is turned off and click the RESCAN button. All fields will populate automatically. DIRAC is reading the info from the NAD product. Pro Tip: Firewall and Antivirus software may need to be completely disabled on your computer as they can block DIRAC from seeing the NAD Product.


b. Mic Config Tab

i. Select the Recording Device for your setup. The recording device is where you have connected the USB dongle earlier. If it is connected to your NAD product, then that product should be selected here. Recording Channel is filled in automatically.

ii. The microphone calibration file for the supplied mic is bundled with the software. Click LOAD FILE and a window will pop up where you can select the supplied microphone config file.

Note: If you are using a 3rd party mic, the mic should be certified for use with DIRAC and will come with its own config file you would load here.


c. Output and Levels Tab

i. Start with your room as quiet as possible, and with your microphone in the center “sweet spot” listening position.

ii. Start with Input Gain set to “0.” Background noise level must stay below the ‐24 dB mark on the Level Meters. The lower the better. If the background noise is approaching the ‐24db mark, reduce the input gain slightly. The input gain and output volume could also be seen as a signal to noise ratio setting (Output Volume is Signal and Background Noise is noise.)

DIRAC Surround Sound Setup

iii. (If the noise level remains well below ‐24 dB, even when the Input Gain is set at “0”, then just leave it set there.)

iv. Now, click the_** Test Button **for the first speaker channel (Left speaker) to start a test tone, and GRADUALLY turn the _Output Volume up until the Level Meter reads towards the center of the green area. Click the Test Button again to stop the test tone when you’re done.

v. Repeat this process with each of the remaining speaker channels. For each channel, turn the Output Volume on that particular channel slider DOWN if the test tone exceeds the top of the green zone, but DO NOT turn the Output Volume of that particular channel UP if the test tone seems to be too quiet. NOTE: If your subwoofer has its own level control, use that to set the volume of the test tone for the sub instead of using the Subwoofer Volume Slider in the DIRAC program.

Dirac Setup

d. Measurements Tab

i. Position the microphone in the exact sweet spot of your listening area. This should be the primary listening position. **Pro Tip: This first placement is absolutely critical. All the impulse (phase/timing) fixes DIRAC will perform are based on this first signal sweep. **

ii. Click START and the signal sweeps will begin. A sweep will occur starting in the left speaker, then go through every speaker in the system. It will finish with the left speaker a second time. If it completes successfully without errors, the program will move you on to the next position. _Note: A DIRAC Pro License will open the other seating area guides _

Dirac Setup

iii. Common errors

  1. Signal Level too low – Your receiver may be playing too quietly. Go back to the Levels Tab and make sure everything is set correctly. Also check your microphone dongle assembly as noted in step 4a.

  2. Clipped signals – The level is too high, or there were loud transient noises that disrupted the signal, like a door slam. This is easily noticeable on the signal graph as a big red line:

Dirac Setup

iv. Once all 9 positions are completed successfully, it is _**STRONGLY **_suggested to save your project. This way you always have your raw data to fall back on. If you want to make changes, you won’t need to perform all the signal sweeps again…unless something in your room has changed (Speaker locations, furniture locations, etc.) The file name you use will become the name of the actual DIRAC filter in the OSD of the NAD Product

v. Click PROCEED to move to the next step.

e. Filter Design Tab

How to Dirac Setup

i. Click **OPTIMIZE **to have DIRAC automatically apply the correction and get the response curve as close to the orange line as possible. Advanced users can manually move around the orange target line by clicking and dragging the orange dots. Unless you are extremely familiar with DIRAC and your room, this is not advised.

ii. You can apply different Target Curves by clicking** LOAD TARGET**. Paul Barton’s RoomFeel ™ curve is supplied. Pro Tip: If you use the RoomFeel ™ Curve, apply it to all speakers EXCEPT the subwoofer. Otherwise, bass will likely become too loud.

Corrected Response Curve


You can expand or reduce the frequency area you’d like corrected by clicking and

dragging the grey hands on the lighter area. Note: A DIRAC Pro License is needed to correct frequencies above 500hz (Included in M17V2).

iii. Click **PROCEED **to move to the **Export Tab **

f. Export Tab

i. Click and drag your newly created filter down into one of the available DIRAC slots below. The DIRAC program will say “Loading Filter…” and the front panel of the NAD Product will say “Saving Filter.”

ii. To clear a filter from a slot, click and drag it up to the Trash Can.


iii. At this point you can go back to previous steps if you want to create additional filters. The NAD product can hold up to 3 DIRAC filters. This is also why we saved the project earlier before any corrections were made.

_Useful Tips and Tricks _

_ The DIRAC software needs an open internet connection. The software must be able to communicate with DIRAC HQ for proper filter creation. _

 Use the included USB extension cable to keep the Wi‐Fi chip away from the rest of the BluOS kit. This keeps interference of the Wi‐fi signal at a minimum. T777V3 and M17V2 also have a wired network port.


_ The receiver and the computer must be connected to the same network. _

_ Antivirus programs and firewall software can impede the DIRAC app from functioning properly. These should be disabled before proceeding with the DIRAC calibration. _

_ Any changes to the configuration of your NAD Product will make DIRAC turn itself OFF as the filter no longer matches the setup it was designed for. If you add Height Channel speakers, for example, DIRAC will turn off as those speakers were not part of the original calibration. DIRAC can’t be forced back on. A new calibration will need to be performed, or the added channels must be disabled so everything matches again. _

_ The Microphone should be in “free air” with no sources of reflection, a mini or full‐size tripod works great. _

For additional assistance: [email protected] or 1‐888‐263‐4641

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