miniDSP NANOAVR DL User manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 1
NANOAVR DL
8-CHANNEL HDMI AUDIO PROCESSOR
WITH DIRAC LIVE®TECHNOLOGY
User Manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 2
Revision history
Revision
Description
Date
1.0
Initial public release
4 December 2014

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 3
TABLE OF CONTENTS
Important Information......................................................................................................................................... 5
System Requirements ...................................................................................................................................... 5
Disclaimer/Warning ......................................................................................................................................... 5
Warranty Terms............................................................................................................................................... 5
FCC Class B Statement...................................................................................................................................... 5
CE Mark Statement .......................................................................................................................................... 6
What’s Included............................................................................................................................................... 6
A Note on this Manual ..................................................................................................................................... 6
1 Product Overview.......................................................................................................................................... 7
1.1 Typical system configuration ................................................................................................................ 7
1.2 How Dirac Live® works ......................................................................................................................... 8
1.3 NanoAVR DL / Dirac Live® configuration steps .................................................................................... 10
2 Installation and Setup.................................................................................................................................. 11
2.1 Software installation and license activation........................................................................................ 11
2.1.1 Framework installation ............................................................................................................... 11
2.1.2 Software installation................................................................................................................... 11
2.1.3 License activation ....................................................................................................................... 12
2.1.4 License validation ....................................................................................................................... 13
2.2 Hardware connectivity ....................................................................................................................... 14
2.2.1 HDMI input and output............................................................................................................... 14
2.2.2 Ethernet ..................................................................................................................................... 14
2.2.3 DC Power.................................................................................................................................... 15
2.2.4 USB............................................................................................................................................. 15
3 Acoustic Measurement................................................................................................................................ 16
3.1 Loudspeaker and microphone positioning .......................................................................................... 16
3.2 Connections for acoustic measurement.............................................................................................. 17
3.3 Configuring for measurement............................................................................................................. 18
3.3.1 Sound System tab ....................................................................................................................... 19
3.3.2 Mic Config tab ............................................................................................................................ 20
3.3.3 Output & Levels tab .................................................................................................................... 21
3.4 Running the measurements................................................................................................................ 22
3.4.1 Listening environment ................................................................................................................ 23
3.4.2 Executing a measurement........................................................................................................... 24
3.4.3 Completing the measurements................................................................................................... 25
3.4.4 Viewing and redoing measurements........................................................................................... 25
3.5 Saving and loading projects ................................................................................................................ 25
4 Filter Design ................................................................................................................................................ 26
4.1 Working with graphs .......................................................................................................................... 27
4.2 Designing your target curve................................................................................................................ 29
4.2.1 The Auto Target.......................................................................................................................... 29
4.2.2 Editing the target curve .............................................................................................................. 29

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4.2.3 Guidelines for target curve design .............................................................................................. 30
4.2.4 Saving and loading target curves................................................................................................. 31
4.3 Generating correction filters............................................................................................................... 32
4.4 Downloading and managing filter sets................................................................................................ 33
5 Using the NanoAVR DL HDMI audio processor ............................................................................................. 34
5.1 Status indicators................................................................................................................................. 34
5.2 Front panel controls ........................................................................................................................... 34
5.3 Infrared remote control...................................................................................................................... 35
5.4 Smartphone control app..................................................................................................................... 36
6 Additional Information ................................................................................................................................ 37
6.1 Specifications ..................................................................................................................................... 37
6.2 Troubleshooting ................................................................................................................................. 38
6.3 MCU Firmware upgrade ..................................................................................................................... 40
6.4 Obtaining Support .............................................................................................................................. 42

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IMPORTANT INFORMATION
Please read the following information before use. In case of any questions, please contact miniDSP via the
support portal at minidsp.desk.com.
SYSTEM REQUIREMENTS
To configure your NanoAVR DL HDMI audio processor, you will require a Windows PC with the following
minimum specification:
Intel Pentium III or later, AMD Athlon XP or later
2 Gigabytes (GB) of RAM or higher
Keyboard and mouse or compatible pointing device
Microsoft• ® Windows® Vista® SP1/Win7/Win8
Microsoft• ® .NET framework v3.5 or later
Two free USB 2.0 ports
DISCLAIMER/WARNING
miniDSP cannot be held responsible for any damage that may result from the improper use or incorrect
configuration of this product. Please read this manual carefully to ensure that you fully understand how to
operate and use this product, as incorrect use or use beyond the parameters and ways recommended in this
manual have the potential to cause damage to your audio system.
Please also note that many of the questions we receive at the technical support department are already
answered in this User Manual and in the online application notes on the miniDSP.com website. So please take
the time to carefully read this user manual and the online technical documentation. And if an issue arises with
your unit, please read through the Troubleshooting section first. Thank you for your understanding!
WARRANTY TERMS
miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one
year from the invoice date. Our warranty does not cover failure of the product due to incorrect connection or
installation, improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any
way, or any usage outside of that recommended in this manual. If in doubt, contact miniDSP prior to use.
FCC CLASS BSTATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired
operation.

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Warning: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
Notice: Shielded interface cable must be used in order to comply with emission limits.
Notice: Changes or modification not expressly approved by the party responsible for compliance could void the
user’s authority to operate the equipment.
CE MARK STATEMENT
The nanoAVR DL has passed the test performed according to European Standard EN 55022 Class B.
WHAT’S INCLUDED
One NanoAVR DL HDMI audio processor
One universal 5 VDC power supply with interchangeable power pins
One USB cable for computer connectivity (1.5m)
One flat HDMI v1.4 flat cable (1.5m)
One full license for Dirac Live Calibration Tool for miniDSP
Printed Quick-start Guide
Note: your nanoAVR DL purchase does not include the required UMIK-1 USB measurement microphone. Please
add a UMIK-1 to your order if you do not already have one.
ANOTE ON THIS MANUAL
This User Manual is designed for reading in both print and on the computer. If printing the manual, please print
double-sided. The embedded page size is 8 ½” x 11”. Printing on A4 paper will result in a slightly reduced size.
For reading on the computer, we have included hyperlinked cross-references throughout the manual. In
addition, a table of contents is embedded in the PDF file, which will make navigation much easier:
In Adobe Reader on Windows, click on the “bookmarks” icon at the left. The table of contents will appear on
the left and can be unfolded at each level by clicking on the “+” icons.
In Preview on the Mac, click on the View menu and select Table of Contents. The table of contents will
appear on the left and can be unfolded at each level by clicking on the triangle icons.

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1PRODUCT OVERVIEW
Thank you for purchasing a NanoAVR DL HDMI audio processor powered by Dirac Live®, the world’s premier
room correction solution. We are delighted to offer you this software and hardware combination, the fruit of
extensive research and development and years of experience in sound system tuning.
The nanoAVR DL is a 2-input HDMI 1.4a switch combined with a sophisticated digital audio signal processor
(DSP) running the Dirac Live® room correction algorithm. The onboard floating-point SHARC processor allows full
time and phase correction of a 7.1 home theater or multichannel audio system using linear PCM (LPCM) audio.
The nanoAVR DL is one of the products in the miniDSP Home Theater Series of audio processors. Deploying a
nanoAVR DL processor in your home theater system will:
Improve imaging and immersion
Improve clarity of music and dialog
Produce a tighter bass
Reduce listening fatigue
Remove resonances and room modes
Reduce early reflections
1.1 TYPICAL SYSTEM CONFIGURATION
The nanoAVR DL typically connects between an HDMI source such as a Blu-ray player and an A/V receiver or
processor. Two HDMI sources can be connected to the nanoAVR DL. Audio from the selected HDMI input is
processed by the Dirac Live® algorithm and passed to the output. Video from the selected input is switched
directly to the output, with no processing applied to the video signal.

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Computer connectivity is used to perform acoustic measurements and generate digital room correction filters
for Dirac Live®. Up to four sets of correction filters can be stored on the NanoAVR DL processor and recalled
from the front panel, via an infrared remote, or with the miniDSP smartphone app. Once the processor is fully
configured, the computer is no longer needed.
1.2 HOW DIRAC LIVE®WORKS
The miniDSP NanoAVR DL HDMI audio processor includes Dirac Live®, a premium mixed-phase room correction
technology. This technology is used not only in home stereo and home theater systems but also in cinemas,
recording studios, and luxury cars.
As with any room correction system, Dirac Live® corrects the system’s magnitude response (often referred to
imprecisely as “frequency response”). In contrast to fully automated systems, Dirac Live® corrects the
magnitude response towards a user-adjustable target response. The target response takes account of the
natural frequency range of the loudspeaker system and the normal effects of loudspeaker dispersion on the
measured in-room magnitude response.
Illustration of Dirac Live® magnitude response correction
In addition, Dirac Live® corrects the system’s impulse response, which reflects how the system responds to a
sharp transient such as a drumbeat. Reflections, diffraction, resonances, misaligned drivers, and so on, all
combine to smear out the transient. An ideal loudspeaker has none of these, so correcting the impulse response
makes the speaker in the room behave much more like that ideal loudspeaker. The impulse response is a critical
factor for accurate sound-staging, clarity and bass reproduction. Dirac Live® employs a sophisticated analysis
algorithm to make the optimal correction across the whole listening area, not just at a single point.

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Illustration of Dirac Live® impulse response correction
Dirac Live® accomplishes this using mixed-phase filters –filters that match a desired magnitude response and
generate a customized impulse response. This contrasts with the minimum-phase and linear-phase filters that
are commonly used in audio applications. While minimum-phase and linear-phase filters are relatively easy to
design, they are tightly constrained in their impulse response characteristics –neither can make a desired
change to the magnitude response independently of controlling the impulse response. In some cases, they may
even make things worse.
Mixed-phase filters are more difficult to design, but the audible performance of Dirac Live® is due to its success
in using mixed-phase filters to make the system response across the whole listening area more closely resemble
that of an ideal speaker. The energy from the direct wave and from early reflections is optimally combined to
arrive as a single wavefront to the listener. Late reflections are left largely untouched, being corrected only for
their spectral coloration, as they contribute to a larger, more enveloping soundstage.

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1.3 NANOAVR DL /DIRAC LIVE®CONFIGURATION STEPS
The steps for configuring the NanoAVR DL HDMI audio processor with Dirac Live® to optimize your home theater
system is summarized as follows:
1. Connect the NanoAVR DL audio processor into your system and
install software. See Section 2, Installation and Setup.
2. Run a series of acoustic measurements using the Dirac Live
Calibration Tool For miniDSP program, to capture the acoustic
behavior of your speakers and room. See Section 3, Acoustic
Measurement.
3. Generate the digital room correction filters that will be executed
by the NanoAVR DL processor. Up to four filter sets can be
downloaded into the processor for easy real-time recall and
auditioning. See Section 4, Filter Design.
4. Once the digital room correction filters are designed and
downloaded, the computer can be disconnected, as computer
connectivity is not required for normal listening. See Section 5,
Using the NanoAVR DL HDMI audio processor.