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Summary of Contents for miniDSP HA-DSP
- Page 1 HA-DSP DSP- ENABLED PORTABLE HEADPHONE AMPLIFIER WITH PROCESSING AND CROSS FEED User Manual miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
- Page 2 Date V0.2 Preliminary version 12 June 2017 V0.3 Updated for released plugin 28 June 2017 V1.0 Substantial update for cross-feed plugin 15 November 2018 miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 3: Table Of Contents
ASIO ..............................17 5.3.3 miniDSP UAC control panel ......................17 DSD playback mode ..........................18 The miniDSP HA-DSP Controller App (Android) ..................19 Installing the Software ........................... 21 Downloading the software ........................21 Installation on Windows .......................... 22 Installation on Mac ..........................23 miniDSP Ltd, Hong Kong / www.minidsp.com... - Page 4 Configuring the HA-DSP.......................... 24 First-time connection ..........................24 Processing overview ..........................25 Linked mode ............................26 Input selection ............................26 Input controls ............................27 Bass and treble controls .......................... 28 Parametric EQ (PEQ) ..........................29 8.7.1 Overview ............................29 8.7.2 Types of filter ...........................
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Page 5: 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 •... - Page 6 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.
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Page 7: Product Overview
Four DSP processing configurations are stored on-board and can be selected using the button on the front panel or with the Android control app. The HA-DSP features three inputs – USB, digital optical, and analog – allowing it to be used with almost any portable music device. -
Page 8: Quick-Start Guide
4. Turn on the HA-DSP with the volume knob. Leave the volume knob at a low level at this point. 5. Wait until one of the LEDs on the front panel of the HA-DSP turn on. Start playing audio from your source. -
Page 9: Charging And Power
Note: some USB ports supply only limited current. Therefore, while connected to such a device via the Micro-B port, the HA-DSP will only trickle-charge. If it is in use at the same time to play audio, it may even continue to drain the battery. -
Page 10: Connections
4.1 A NALOG INPUT To connect an analog source, plug a 3.5 mm stereo plug into the input jack. The HA-DSP will automatically detect the analog input and switch to it. USB Audio will be disabled. You can use: • The supplied 3.5 mm to 3.5 mm cable. This short cable is perfect for connecting to a phone. -
Page 11: Digital Optical Input
4.2 D IGITAL OPTICAL INPUT To connect a digital source, plug a 3.5mm optical connector into the input jack. The HA-DSP will automatically detect the optical input and switch to it. USB Audio will be disabled. You can use: • The supplied TOSLINK to mini-TOSLINK adapter with a regular TOSLINK cable, or •... -
Page 12: Android
Android device’s micro USB port to the micro USB port on the HA-DSP. Your Android device must support the USB OTG standard to play audio to the HA-DSP over USB. Check the specifications of your device and/or its user manual. (If your device does not support OTG, then you can still play audio through the HA-DSP using the analog input.) -
Page 13: Computer (Usb)
Alternatively, connect the computer to the Type A port with a Type A – Type A USB cable. In this case, the Type A port can be used to configure the HA-DSP and play audio, while the Type B port is used to charge the HA-DSP. -
Page 14: Headphone Output
If your headphones have a 6.35 mm (1/4-inch) plug, you will need to use an adapter plug or pigtail. Turn the volume knob to the lowest position (without turning off the amplifier) when inserting the headphone plug. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 15: Usb Audio
UDIO 5.1 A NDROID AND I Connect the HA-DSP to your Android or iOS device as shown on page 12. Android and iOS will automatically direct audio output to the HA-DSP. OS / OS X Open the program Audio MIDI Setup (in Applications->Utilities). Clicking on “HA-DSP” in the list on the left- hand side will show the input and output channels and allow sample rate and word length to be set. -
Page 16: Windows
5.3.1 Windows default audio device To set the HA-DSP as the default audio output device, open the Windows Control Panel and navigate to the Audio Devices section. On the Playback tab, select “HA-DSP” and click on the “Set Default” button. -
Page 17: Asio
5.3.3 miniDSP UAC control panel The current settings of the HA-DSP can be viewed by opening the miniDSP UAC Control Panel from the Windows Start menu. This control panel allows you to view current settings. In addition, it can be used to set buffer size, although we recommend that you leave this setting at the default. -
Page 18: Dsd Playback Mode
What if I want to keep the processing while playing DSD files? You will need to tell the player to convert the DSD to PCM before sending it to the HA-DSP. Some players will do this automatically, while others may need a specific setting to convert to PCM. -
Page 19: The Minidsp Ha-Dsp Controller App (Android)
After installing the app, click Connect and then OK to allow the app to access the HA-DSP: On the main screen, volume can be set with the slider and the device can be muted. Click on the dropdown... - Page 20 Tap on PEQ to access the parametric EQ screen. Up to 10 EQ points can be manipulated on this screen. See page 29 for more information on the meanings of the PEQ parameters. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 21: Installing The Software
NSTALLING THE OFTWARE To access the full capabilities of your HA-DSP, you will need to install software on your computer as follows: Windows • The HA-DSP-CF plugin software that runs on your computer. • The drivers that Windows and the plugin need to communicate with the HA-DSP. -
Page 22: Installation On Windows
Internet when you run the installer. 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. -
Page 23: Installation On Mac
Navigate to the Plugins folder of the software download and then to the Mac folder. The installer program is named HA-DSP-CF.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. -
Page 24: Configuring The Ha-Dsp
Click on the Connect button at the top right of the window. The first time the following dialog pops up, click on “Restore Config”. This ensures that both the user interface and the HA-DSP are reset to defaults. The Connect button will change to show “Connected”. At this point, the plugin is in online mode. This is also called “synchronized”... -
Page 25: Processing Overview
8.2 P ROCESSING OVERVIEW Figure 2 shows the software flow of the HA-DSP-CF plugin. Figure 2. Software flow diagram of HA-DSP-CF plugin The audio processing parameters are accessed by clicking on each of the processing blocks in the top section of the user interface. -
Page 26: Linked Mode
• If a USB host device is connected, then the USB input is selected. (Note: a USB charger is not a host device, so you can still charge the HA-DSP while listening to other inputs.) • If no USB host device is connected but a digital optical signal is present, then that input is selected. -
Page 27: Input Controls
Mute Press this button to mute that input channel. The button color and label changes to show that the channel is muted. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 28: Bass And Treble Controls
(orange) and minimum (grey), with turnover frequency of 200 Hz: Here is the response with treble control at maximum (orange) and minimum (grey), with turnover frequency of 3000 Hz: miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 29: Parametric Eq (Peq)
EQ (PEQ) ARAMETRIC Parametric equalization (PEQ) is a flexible type of equalization filter. In the HA-DSP, this block is commonly used to correct the frequency response of the headphones. This can be done simply “by ear” or by using published measurements of your headphones, but best results are achieved with the aid of measurements. - Page 30 Click here to save the current EQ profile to earsdb.com. You will need to create an account on earsdb.com to do this. This is an experimental feature, and we welcome your feedback and suggestions for improvements. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice...
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Page 31: Types Of Filter
This filter will have no effect on the displayed graph. This should be considered an advanced option that will not be of use to 99% of users. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 32: Peq Advanced Mode
The display will change as shown below. Paste in the coefficients in the format shown, then click on the Process button for them to take effect: miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 33: Parametric Eq File Import (Rew Integration)
It can generate a bank of parametric EQ biquads based on a measurement. Room EQ Wizard can be downloaded here: • http://www.roomeqwizard.com/#downloads For guidance on using this feature, please refer to the app note Auto EQ with REW. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 34: Fir Filtering
FIR ("finite impulse response") filtering allows construction of equalization filters with independent control of amplitude and phase. The HA-DSP has an FIR filtering block on each channel as the last processing block prior to the headphone output. There is an additional FIR filtering block on each cross-feed channel. -
Page 35: Fir Filter Design Software
8.9.2 FIR filter design software The filter coefficients must be created with the aid of filter design software. miniDSP does not provide any such software, instead referring you to the many software packages available for this purpose, both freeware and commercial. -
Page 36: Converting Peq To Fir
4. Set the number of taps that you have allocated to your filter banks (the other parameters shown here can be left at the defaults): miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... - Page 37 6. Click the generate button. The result will be shown in red. 7. In the HA-DSP-CF plugin, open the FIR block, click on Browse and locate the file that you saved from rephase. After loading it you will be able to confirm the amplitude response of the filter: (If you still see a flat line, check that the filter is not bypassed –...
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Page 38: Cross-Feed Processing
The miniDSP implementation of cross-feed is “open” – that is, the plugin and processing does not decide how the cross-feed is implemented, but provides DSP tools so you to choose how to implement the cross-feed. -
Page 39: Delay
If not using the above filter, it’s best to reduce the signal level slightly in the Input Control block, to eliminate any possibility of clipping at the final processing stage. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 40: Avoiding Clipping
There are two places where clipping can occur: 1. In the A/D convertor. The HA-DSP has a maximum input signal level of 1.0 V RMS. If this level is exceeded, clipping of the A/D convertor will result. This can be avoided by reducing the signal level at the analog source. -
Page 41: A Simple Example
The signal is scaled down in the Input Gain stage, so that when the EQ stage boosts it, it remains in the range –1.0 to +1.0. Again, there is no clipping at the output stage. miniDSP Ltd, Hong Kong / www.minidsp.com... -
Page 42: A More Realistic Example
8.11.2 A more realistic example In practice, the HA-DSP is processing a signal with a spread of frequencies. Consider the example EQ shown on page 29: With the default unity gain through all DSP processing blocks, this filter will result in clipping on music with a lot of bass content. -
Page 43: The "No Gain" Approach
For each halving of b0, the gain of the whole PEQ block is reduced by 6 dB. So use the value 0.25 for a 12 dB reduction in level. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 44: Configuration Presets
EQ, FIR filtering and the routing matrix. It does not include the volume set by the volume knob. Four configurations are stored onboard in the HA-DSP as presets. By default, these are all set to “straight- through” processing. -
Page 45: Restoring Defaults
• If you have changed something in the UI since you were last connected, you will see the following dialog: Synchronize Config Download the current configuration into the corresponding configuration preset of the HA-DSP. After downloading the configuration data, the plugin is in online mode. -
Page 46: Other Information
Dimensions (H x W x D) 20 x 69 x 137 mm Weight 230 g (*) DSP processor is disabled in DSD playback mode. miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice... -
Page 47: Firmware Upgrade
9.2 F IRMWARE UPGRADE miniDSP may occasionally provide an upgrade to the HA-DSP MCU firmware to enable new features. To upgrade the MCU firmware, first download the latest version of the HA-DSP software package from the User Downloads section of the miniDSP website, then extract it on your computer (on Windows, right-click and select “Extract All...”;... - Page 48 You will get a progress bar as upgrade proceeds: Once the firmware upgrade completes, you will see a message that the upgrade completed successfully: Click on Exit. That’s it! You’re done. You can now use your HA-DSP with the new functionality. miniDSP Ltd, Hong Kong / www.minidsp.com...
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Page 49: Macos / Os X
9.2.2 macOS / OS X Connect the HA-DSP to your computer via USB (if not already connected) and power it on. Navigate to the XMOS_Firmware/Firmware_Upgrade_Tools/Mac folder of the software download. Double-click on the DFU Utility.app program to run it: miniDSP Ltd, Hong Kong / www.minidsp.com... - Page 50 You will get a progress bar as the upgrade proceeds: Once the firmware upgrade completes, you will see a message that the upgrade completed successfully: Click on Exit. That’s it! You’re done. You can now use your HA-DSP with the new functionality. miniDSP Ltd, Hong Kong / www.minidsp.com...
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