miniDSP NANOSHARC User manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 1
NANOSHARC
2-IN 8-OUT I2SAUDIO PROCESSOR BOARD
WITH FIR PROCESSING CAPABILITY
User Manual

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Revision history
Revision
Description
Date
V1.0
First version
22 Sept 2016
V1.1
Updated for dedicated plugin. New firmware
update tools.
31 Aug 2018
V1.2
Link to nanoSHARC 2x8 plugin, updated
screenshots.
31 Aug 2018

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CONTENTS
Important Information ...............................................................................................................................................5
System Requirements.............................................................................................................................................5
Disclaimer/Warning................................................................................................................................................5
Warranty Terms......................................................................................................................................................6
FCC Class B Statement............................................................................................................................................6
CE Mark Statement.................................................................................................................................................6
A note on this manual ............................................................................................................................................6
1 Product Overview ................................................................................................................................................7
1.1 The miniDSP concept..................................................................................................................................7
1.2 Software plugin ..........................................................................................................................................8
1.3 Ordering plugins .........................................................................................................................................8
2 Board Layout and Connectivity............................................................................................................................9
2.1 Board layout ...............................................................................................................................................9
2.2 DC power....................................................................................................................................................9
2.3 USB connectivity.........................................................................................................................................9
2.4 Optical digital audio input ..........................................................................................................................9
2.5 I2S expansion header pinouts ................................................................................................................. 10
2.6 I2S overview ............................................................................................................................................ 10
2.7 I2S details................................................................................................................................................. 11
2.8 Additional I2S usage notes ...................................................................................................................... 12
3 Software installation......................................................................................................................................... 13
3.1 Windows.................................................................................................................................................. 13
3.1.1 Possible Windows installation issues .............................................................................................. 13
3.1.2 Plugin installation ............................................................................................................................ 14
3.1.3 USB Driver installation..................................................................................................................... 14
3.2 Mac.......................................................................................................................................................... 15
3.2.1 Possible Mac installation issues....................................................................................................... 15
3.2.2 Plugin installation ............................................................................................................................ 15
4 Configuring the nanoSHARC ............................................................................................................................. 16
4.1 Synchronizing with the processor ........................................................................................................... 17
4.2 Master control......................................................................................................................................... 18
4.3 Configuration/preset selection ............................................................................................................... 18
4.4 Inputs & Routing tab ............................................................................................................................... 19
4.4.1 Input selection................................................................................................................................. 19
4.4.2 Input channel strips......................................................................................................................... 20
4.4.3 Routing ............................................................................................................................................ 21
4.5 Output tab ............................................................................................................................................... 22
4.5.1 Channel strip layout......................................................................................................................... 22
4.5.2 Channel label................................................................................................................................... 22
4.5.3 Level meter and gain control........................................................................................................... 22
4.5.4 Parametric EQ.................................................................................................................................. 23
4.5.5 Crossover......................................................................................................................................... 25

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4.5.6 Compressor...................................................................................................................................... 27
4.5.7 FIR.................................................................................................................................................... 28
4.5.8 Invert and mute............................................................................................................................... 28
4.5.9 Time delay ....................................................................................................................................... 28
4.6 Custom biquad programming.................................................................................................................. 29
4.6.1 What’s a “biquad?........................................................................................................................... 29
4.6.2 Using custom biquad programming ................................................................................................ 29
4.6.3 Biquad design software................................................................................................................... 31
4.7 FIR filtering and design............................................................................................................................ 32
4.7.1 FIR filtering overview....................................................................................................................... 33
4.7.2 FIR filter design software................................................................................................................. 33
4.7.3 Filter file format............................................................................................................................... 33
4.7.4 Loading filter coefficients ................................................................................................................ 34
4.8 Working with configurations................................................................................................................... 35
4.8.1 Online and offline mode.................................................................................................................. 35
4.8.2 Selecting a configuration................................................................................................................. 35
4.8.3 Saving and loading configurations................................................................................................... 36
4.8.4 Restoring to defaults ....................................................................................................................... 36
4.9 Keyboard shortcuts ................................................................................................................................. 37
5 USB Audio ......................................................................................................................................................... 38
5.1 Mac OS X.................................................................................................................................................. 38
5.2 Windows.................................................................................................................................................. 39
6 Infrared remote control.................................................................................................................................... 40
7 Additional information...................................................................................................................................... 41
7.1 Specifications........................................................................................................................................... 41
7.2 Firmware upgrade ................................................................................................................................... 42
7.2.1 Windows.......................................................................................................................................... 42
7.2.2 macOS / OS X................................................................................................................................... 44
7.3 Troubleshooting ...................................................................................................................................... 46
7.4 Obtaining support.................................................................................................................................... 46

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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 the miniDSP audio processor, you will require a Windows PC or Apple Mac OS X computer with the
following minimum specification:
Windows
•PC with 1GHz or higher processor clock speed. Intel® Pentium®/Celeron® family, or AMD K6®/AMD
Athlon®/AMD Duron® family, or compatible processor recommended.
•512 megabytes (MB) of RAM or higher
•Keyboard and mouse or compatible pointing device
•USB 2.0 port
•Microsoft• ® Windows® Vista® SP1/ XP pro SP2/Win7/Win8.1/Win10
•Microsoft• ® .NET framework v3.5 or later
•Adobe AIR environment (latest version)
•Adobe Flash player (latest version)
Mac OS X
•Intel-based Mac with 1 GHz or higher processor clock speed
•512 megabytes (MB) of RAM or higher
•Keyboard and mouse or compatible pointing device
•USB 2.0 port
•OS X 10.8 or higher, macOS 10.12 or higher
•Adobe AIR environment (latest version)
•Adobe Flash player (latest version)
DISCLAIMER/WARNING
miniDSP cannot be held responsible for any damage that may result from the improper use of this product or
incorrect configuration of its settings. As with any other product, we recommend that you carefully read this
manual and other technical notes to ensure that you fully understand how to operate this product. The miniDSP
audio processor is a powerful tool, and misuse or misconfiguration, such as incorrectly set gains or excessive
boost, can produce signals that may damage your audio system.
As a general guideline, you should perform the initial configuration of the miniDSP audio processor before
enabling audio through any connected output device or amplification. Doing so will help ensure that the
software is correctly configured.

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Finally, note that the miniDSP audio processor is a very flexible device, and many of the questions we receive at
the tech 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
support. Thanks 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.
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 nanoSHARC has passed the test performed according to European Standard EN 55022 Class B.
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.

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1PRODUCT OVERVIEW
Thank you for choosing the nanoSHARC audio processor board. The nanoSHARC is a tiny yet extremely powerful
and flexible digital audio processing circuit board intended for OEM applications and advanced DIY enthusiasts.
It includes an onboard optical digital input and asynchronous USB audio input. Audio output and additional
audio inputs are to be provided by the system integrator via I2S interfaces.
The audio processing functionality of the board is implemented via the use of a software plugin. For more
information on supported plugins, see Software plugins on page 8.
The nanoSHARC is an evolution of miniDSP’s existing audio processing solutions. For those seeking a ready-made
“in the box” solution, please see our 2x4 HD, DDRC-24, and other products.
1.1 THE MINIDSP CONCEPT
The miniDSP concept is “one hardware unit + one software plugin = audio processing solution.” This concept
leverages the inherent flexibility of DSP (digital signal processing) to deliver a range of flexible but cost-effective
solutions.
Hardware unit
In this case, the hardware unit is the miniDSP nanoSHARC board together with your own I2S
interface hardware.
Software plugin
The software plugin is installed on your PC or Mac, and determines the processing that the DSP
will perform. It provides a friendly user interface, and downloads instructions into the miniDSP
hardware unit that tell it how to process the audio signal.

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1.2 SOFTWARE PLUGIN
A dedicated plugin, nanoSHARC-2x8-96k, is available for the nanoSHARC board. Its key features are summarized
below. In addition, the miniDSP 2x4 HD1 plugin can be used with the nanoSHARC board.
Table 1. nanoSHARC plugins
nanoSHARC-2x8-96k
2x4 HD1
Internal sample rate
96 kHz
96 kHz
Number of input channels
2
2
Number of output channels
8
4
Access to I2S input1
✓
✓
Access to I2S output1
✓
✓
Number of FIR taps (total)
3400
4096
Minimum FIR taps per channel
6
6
Maximum FIR taps per channel
2048
2048
PEQ bands per input channel
10
10
PEQ bands per output channel
10
10
Compressor block
✓
✓
Max per-channel time delay
35 ms
80 ms
1. Requires suitable hardware/interface circuitry.
1.3 ORDERING PLUGINS
Plugins must be ordered in addition to the hardware:
•nanoSHARC 2x8 96k plugin
•2x4 HD1 plugin

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2BOARD LAYOUT AND CONNECTIVITY
This section describes the board and its interfaces.
2.1 BOARD LAYOUT
This diagram shows the layout of the nanoSHARC board.
2.2 DC POWER
Provide DC power between pins 9 and 10 (ground) and pins 11 and 12 (12 V DC) of header J2. The supply voltage
must be 12V DC, or the board may malfunction or be damaged. The power supply must be capable of supplying
at least 300 mA at 12V DC.
2.3 USB CONNECTIVITY
Connect the mini USB port (mini type B) to a computer to configure the board. The USB port also provides
asynchronous USB Audio (Class 2) streaming at all standard sample rates from 44.1 to 192 kHz. USB Audio input
is selected from within the plugin or via remote control.
2.4 OPTICAL DIGITAL AUDIO INPUT
Connect the optical port to a digital source. Thanks to the onboard ASRC (asynchronous sample rate converter),
sample rates from 20 to 216 kHz are accepted. Optical digital audio input is selected from within the plugin or
via remote control.

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2.5 I2S EXPANSION HEADER PINOUTS
Headers J2 and J5 are provided for connection of I/O circuitry via I2S. The pinouts are shown in Table 2 and
Table 3. Note that I2C_SCL and I2C_SDA are intended for miniDSP use only –they are not documented or
supported for other use.
Table 2. J2 expansion header pinout
Pin
Function
Pin
Function
1
I2S_LRCLK
2
I2S_BCLK
3
GND
4
MCLK
5
I2S_OUT0
6
I2S_OUT1
7
I2C_SCL
8
I2C_SDA
9
GND
10
GND
11
+12V
12
+12V
Table 3. J5 expansion header pinout
Pin
Function
Pin
Function
1
I2S_LRCLK
2
I2S_BCLK
3
GND
4
MCLK
5
I2S_OUT0
6
I2S_OUT1
7
I2S_OUT2
6
I2S_OUT3
9
GND
10
GND
11
I2S_IN0
12
I2S_IN1*
13
I2S_IN2*
14
I2S_IN3*
* Not accessed by current plugins
2.6 I2S OVERVIEW
I2S, or Inter IC Sound, is an electrical serial bus used to interface digital audio devices at the chip and circuit
board level. An I2S interface consists of up to three clocks, and a data line for each pair of channels. There are
three types of clock:
MCLK The master clock that the nanoSHARC uses internally. This clock is always provided as an output
by the nanoSHARC, and connected circuitry can choose whether or not to use it.
LRCLK The frame synchronization clock, also known as the word clock. This clock is equal to the
sampling frequency (Fs) of the audio signal.
BCLK The bit clock (also known as shift clock or system clock). This is always equal to 64 x Fs.

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Table 4 summarizes the relation between the clocks for the 96 kHz plugin.
Table 4. I2S clock ratios
Plugin sample rate (LRCLK)
Master clock (MCLK)
Bit clock (BCLK)
MCLK/LRCLK
BCLK/LRCLK
96 kHz
24.576 MHz
6.144 MHz
256
64
The timing of data lines is determined by the bit clock and the word clock, as illustrated in the following diagram:
The nanoSHARC board has four I2S input data lines and four I2S output data lines, each carrying two channels of
audio. Note, however, that the input data lines for channels 3 through 8 (I2S_IN1, I2S_IN2, and I2S_IN3) are not
used by current plugins.
2.7 I2S DETAILS
The nanoSHARC acts in master mode with respect to I2S clocking.
That is, the nanoSHARC provides the I2S clocks and the connected devices are expected to transmit and receive
data using those clocks. The clocks will match the sample rate of the plugin loaded onto the nanoSHARC. (See
the miniSHARC User Manual for more information about I2S master and slave modes). A typical connection
scenario is shown in Figure 1. Note that:
1. The connected devices may or may not use MCLK. This is dependent on the specifics of the devices.
2. The digital optical and asynchronous USB audio inputs use an onboard asynchronous sample rate
convertor to convert the incoming sample rate to the nanoSHARC’s clock domain.
3. External digital input circuitry will need to use an asynchronous sample rate convertor to convert the
incoming sample rate to the nanoSHARC’s clock domain.

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2.8 ADDITIONAL I2S USAGE NOTES
I2S is not a “plug and play” protocol. It requires attention to technical details such as clocking and wire layout. It
is a solution for OEMs and advanced DIYers (or professionals) with suitable knowledge, skills and measurement
equipment. For off-the-shelf completed units with similar capabilities, please see our 2x4 HD, DDRC-24, and
other products.
Be sure to take the following precautions when designing your I2S interface and wiring:
General I2S usage notes
•Unbuffered I2S lines must be kept short to ensure clock and data integrity.
•If driving longer lines, buffers may be required for the clock signals (MCLK, LRCLK, and BLCK).
•Observe correct grounding and shielding, and keep analog and digital grounds separated.
•Ensure that the clock ratios (as listed in Table 4) are compatible with connected circuits.
3.3V logic level
All lines use a 3.3V logic level. Ensure that connected circuits use a compatible level (1.8V, for example, will
not work).
Figure 1. nanoSHARC I2S connections

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3SOFTWARE INSTALLATION
If you purchased your product directly from miniDSP, your software will be available from the User Downloads
section of the miniDSP website when your order ships. To access the download, you will need to be logged into
the website with the account you created when purchasing.
Note: this installation procedure describes the nanoSHARC-2x8-96k plugin. If you intend to use the 2x4 HD1
plugin with the nanoSHARC board, please follow the procedure in the 2x4 HD User Manual.
If you purchased your product from a miniDSP dealer, you will receive a coupon together with the product.
Redeem this coupon and select the Plugin Group “nanoSHARC” at the link below:
•https://www.minidsp.com/support/redeem-coupon
The User Downloads link is visible from the dropdown menu at the top right of the website page:
Navigate to the OpenDRC/miniSHARC/nanoSHARC plug-ins section and download the zip file under the heading
nanoSHARC 2x8 96k. Unzip the downloaded file (on Windows, right-click and select “Extract All...”; on Mac,
double-click).
Note: the Adobe Air framework may need a network connection the first time the plugin is used. If the plugin
does not start properly, see Troubleshooting.
3.1 WINDOWS
3.1.1 Possible Windows installation issues
The miniDSP software requires that a number of other frameworks be installed for it to work. For Windows 7
and later, these packages should be installed automatically. For earlier versions of Windows, please download
and install the following frameworks before attempting to install any miniDSP software. You can also manually
install these if you receive an error message that required software is missing.
•Microsoft .NET framework (version 3.5 or later)
•Latest version of Adobe Air
•Microsoft Visual C++ 2010 Redistributable Package: for x86 (32-bit operating system) or x64 (64-bit operating
system).

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3.1.2 Plugin installation
1. Navigate to the Plugins folder of the software download and then to the Windows folder.
2. Double-click on the nanoSHARC_2x8_96k.exe installer program to run it. We recommend that you accept
the default installation settings.
3. The plugin will start automatically if you accepted the default installation settings. To make it quicker to run
in future, right-click on its icon in the taskbar and select “Pin to taskbar.”
3.1.3 USB Driver installation
4. Connect the nanoSHARC to the computer using the supplied USB cable, and power it on.
5. Navigate to the WinDrivers folder of the software download and double-click on the appropriate installer:
•miniDSP_UAC2_v2.29.3_ForWinXP_Vista.exe for Windows XP and Vista
•miniDSP_UAC2_ v4.47.0_ForWin7_8_10.exe for Windows 7, 8, and 10
(The version number embedded in the filename may be different.)
We recommend accepting the default installation location. Once the driver installation completes, click the
Finish button.
The Windows PC will not be able to communicate properly with the nanoSHARC if you did not have it
connected by USB and powered on when you installed the driver. If that is the case, you will need to
uninstall the driver, connect the nanoSHARC, power it on, and run the installer again.
Note: the first time you run the plugin, you may see a warning from Windows Firewall as shown below. If so,
ensure that “Private networks...” is checked and “Public networks...” is not checked. Then click on “Allow
access.”

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3.2 MAC
3.2.1 Possible Mac installation issues
If double-clicking on an installer brings up a message that the installer cannot run, use this alternate method
(note that the name of the plugin will be nanoSHARC-2x8-96k.pkg, not MiniDSP_Plugin.pkg as shown in the
screenshots):
1. Right-click on the installer (or click while holding the Control key).
2. On the menu that pops up, move the mouse over the “Open With” item and then click on “Installer
(default).”
3. The following window will appear. Click on “Open.”
3.2.2 Plugin installation
6. Navigate to the Plugins folder of the software download and then to the Mac folder.
7. The installer program is named nanoSHARC-2x8-96k.pkg. To run it, double-click on it, or right-click and
open as described above. We recommend that you accept the default installation settings.
8. To run the nanoSHARC-2x8-96k plugin, locate it in the Applications -> miniDSP folder and double-click on it.
To make it easier to run in future, right-click on its dock icon and select Options -> Keep in Dock.
Note: No USB driver installation is required for Mac OS X.

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4CONFIGURING THE NANOSHARC
The nanoSHARC can be configured with either the nanoSHARC-2x8-96k or 2x4 HD1 plugin / user interface
program. This section describes the nanoSHARC-2x8-96k plugin. If you intend to use the 2x4 HD1 plugin with
the nanoSHARC board, please refer to the 2x4 HD User Manual.
Once the nanoSHARC is fully configured, the computer is no longer required, as source and preset selection can
be done with a remote control. If desired, however, the plugin can remain connected during use for real-time
(“live”) control of all audio processing.
This screenshot shows the nanoSHARC-2x8-96k plugin with the key areas highlighted:
During initial configuration of the processor, it is strongly recommended that any connected
amplification be powered off.
If switching plugins, be sure to use the Refresh DSP Program option from the Restore menu.

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4.1 SYNCHRONIZING WITH THE PROCESSOR
Communication with the processor takes place over a USB connection. Ensure that the computer is connected
to the nanoSHARC by a USB 2.0 port. Then click on the Connect button:
The first time you connect, or if you have made any changes to any data in the user interface, the following
dialog box will appear:
The options are:
Synchronize Config
Download the currently selected configuration into the corresponding configuration preset of
the processor. After downloading the configuration data, the plugin is in online mode and any
changes to processing parameters will be downloaded immediately in real time. That is, the user
interface is now “live.”
Synchronize and Upgrade
This is similar to Synchronize Config, but also upgrades the internal data of the processor. This
option may appear after downloading and installing an updated version of the plugin.
Restore Config
Restore the data in the currently selected configuration to the factory defaults. When using this
option, any connected equipment should be muted or powered off until you have set the
configuration to a working state. Note that the configuration data will be lost, so if needed,
ensure that you have saved the configuration to a file prior to using this option.
Help This option brings up a help screen explaining the options.
Cancel This option cancels the attempt to connect to the processor. The plugin will remain in offline
mode.

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4.2 MASTER CONTROL
Once the plugin is online, the items in the Master Control area are active. The Mute button disables all audio
output:
The Master Volume display shows the current volume setting. The master volume can be set directly by clicking
here and typing a new value. It can also be set with the remote control:
The IP Address and Auto fields are for use with networked control of the plugin using the miniDSP WI-DG
Wifi/Ethernet to USB bridge. See the Wi-DG User Manual for details.
4.3 CONFIGURATION/PRESET SELECTION
The set of data that controls the back-end processing is called a configuration. This includes crossovers,
parametric EQ and the routing matrix. It does not include the master volume or mute status.
Four configurations are stored onboard. The currently selected preset is indicated by a dark background:
To switch to a different preset, just click on the desired button:

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4.4 INPUTS &ROUTING TAB
The Inputs & Routing tab displays two input channel control strips and the 2x8 routing matrix.
4.4.1 Input selection
When the plugin is connected to the nanoSHARC, the currently selected input appears next to the “Inputs” label.
Click on the current input name to drop down a selector menu, from which you can select a different input. (You
can also select the input with a remote control.)

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4.4.2 Input channel strips
Channel label
Each input channel has a customizable label, which is shown at the top of the channel strip. This
label also appears on the Routing matrix. To change the label, click on it, type a new label (up to
eight characters), and press the Return key.
Level meter, Current RMS level
Displays the current signal level in real time. (The plugin must be in online mode to display signal
levels.)
Gain adjustment
The gain of each channel can be adjusted by moving the Gain Adjustment slider, or by typing the
desired gain into the Current Gain text box. The maximum gain setting is 12 dB, and the
minimum gain setting is –72 dB. (0 dB, the default, is unity gain or no change in level.)
PEQ settings
Click on this button to open the parametric EQ settings window for that channel. There are ten
parametric EQ filters on each input channel. For more details, see Parametric EQ on page 23.
Mute
Press this button to mute that input channel. The button color and label changes to show that
the channel is muted.