miniDSP HA-DSP User Manual Download Page 1

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miniDSP Ltd, Hong Kong /

www.minidsp.com

/ Features and specifications subject to change without prior notice

HA-DSP

DSP-

ENABLED PORTABLE HEADPHONE AMPLIFIER

WITH

FIR

PROCESSING AND CROSS

FEED

User Manual

Summary of Contents for HA-DSP

Page 1: ...iniDSP Ltd Hong Kong www minidsp com Features and specifications subject to change without prior notice 1 HA DSP DSP ENABLED PORTABLE HEADPHONE AMPLIFIER WITH FIR PROCESSING AND CROSS FEED User Manual...

Page 2: ...nd specifications subject to change without prior notice 2 Revision history Revision Description Date V0 2 Preliminary version 12 June 2017 V0 3 Updated for released plugin 28 June 2017 V1 0 Substanti...

Page 3: ...off 9 4 Connections 10 4 1 Analog input 10 4 2 Digital optical input 11 4 3 Android 12 4 4 iOS Apple 12 4 5 Computer USB 13 4 6 Headphone output 14 5 USB Audio 15 5 1 Android and iOS 15 5 2 macOS OS...

Page 4: ...overview 34 8 9 2 FIR filter design software 35 8 9 3 Loading filter coefficients in File Mode 35 8 9 4 Loading filter coefficients in Manual Mode 35 8 9 5 Converting PEQ to FIR 36 8 10 Cross feed pr...

Page 5: ...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 miniDS...

Page 6: ...on 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 i...

Page 7: ...fed to a 32 bit ESS Sabre DAC The USB input also supports direct DSD direct stream digital playback where DSD audio DoP is fed directly to the DAC chip DSP processing is disabled while playing DSD He...

Page 8: ...n 3 3 Connect your headphones to the headphone output 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 th...

Page 9: ...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 3 2 CHECKING BATTERY LEVEL 1 Turn the amp off if it is not already 2 Press and hol...

Page 10: ...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 cab...

Page 11: ...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...

Page 12: ...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 While connected to an Android device the miniDSP HA DSP...

Page 13: ...ed USB cable to connect from a USB port must be USB 2 0 compatible on the computer to the micro USB connector on the HA DSP Alternatively connect the computer to the Type A port with a Type A Type A U...

Page 14: ...UTPUT To connect headphones earbuds or in ear monitors IEMs simply plug them into the 3 5mm jack on the front panel If your headphones have a 6 35 mm 1 4 inch plug you will need to use an adapter plug...

Page 15: ...on the left hand side will show the input and output channels and allow sample rate and word length to be set Select a sample rate up to 192 kHz Note Sample rates higher than 192 kHz are an artifact...

Page 16: ...ult 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 To change the bit depth and sampl...

Page 17: ...in JRiver Media Center Again don t select or allow sample rates greater than 192 kHz in the playback program 5 3 3 miniDSP UAC control panel The current settings of the HA DSP can be viewed by opening...

Page 18: ...er PCM DoP What DSD formats are supported The HA DSP supports single rate DSD aka DSD64 and double rate DSD aka DSD128 A DSD capable audio player will detect the sample rate from the DSD file and send...

Page 19: ...e HA DSP is connected to an Android device over USB the miniDSP HA DSP Controller app can be used After installing the app click Connect and then OK to allow the app to access the HA DSP On the main s...

Page 20: ...o parameters the gain and the turnover frequency Gain can be varied from 9 to 9 dB either by typing in the number or using the slider The turnover frequency can be changed from 200 to 750 Hz for bass...

Page 21: ...sp com support redeem coupon To access the download you will need to be logged into the miniDSP com website with the account you created when purchasing The User Downloads link is visible from the dro...

Page 22: ...n future right click on its icon in the taskbar and select Pin to taskbar USB driver installation 1 Connect the processor to the computer using the supplied USB cable and power it on 2 Navigate to the...

Page 23: ...plugin installation 1 Navigate to the Plugins folder of the software download and then to the Mac folder 2 The installer program is named HA DSP CF pkg To run it double click on it or right click and...

Page 24: ...micro USB port on the HA DSP 2 Turn on the HA DSP with the volume knob Don t connect your headphones yet 3 Click on the Connect button at the top right of the window The first time the following dial...

Page 25: ...each of the processing blocks in the top section of the user interface When the block is clicked on it s processing parameters can be set in the lower section of the interface The cross feed block is...

Page 26: ...Generally we recommend that you start using the plugin in linked mode When you find a reason to have separate settings for each channel at that time you can unlink them The settings of the two channel...

Page 27: ...t gain 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 uni...

Page 28: ...box Bass turnover frequency can be adjusted from 200 to 750 Hz The default is 400 Hz Treble turnover frequency can be adjusted from 750 to 3000 Hz The default is 1500 Hz The effect of the bass and tre...

Page 29: ...ion on how to develop a set of parametric EQ filters for your headphones with the aid of the miniDSP EARS headphone measurement rig see the following app notes on our website Headphone EQ with EARS an...

Page 30: ...ncludes the effect of the Bass and Treble controls View Both Channels If checked the graph shows the other channel in grey EQ Profile Click to select a saved EQ profile You can save any number of EQ p...

Page 31: ...SHELF and HIGH_SHELF This filter reduces or increases part of the frequency spectrum The Frequency parameter is the frequency where the response has half the value given by Gain for example if Gain is...

Page 32: ...l filters It can be described either with an equation or with a signal flow diagram as shown here A single biquad like this can perform a great many functions including all of the functions of a singl...

Page 33: ...s the first six filters will be set and the last four will not be changed Note if the last line ends with a comma that counts as an extra biquad If the file contains more than ten biquads then an erro...

Page 34: ...difficult to translate a frequency response from the PEQ block into FIR form and this is covered on page 36 8 9 1 FIR filtering overview FIR filtering differs from the IIR infinite impulse response f...

Page 35: ...appear confirming the number of coefficients loaded 2 Confirm that the response curve is as you expect 3 Press Send to DSP This will write the coefficients into the DSP s memory 4 To clear the filter...

Page 36: ...n FIR If desired additional phase compensation can be implemented at the same time For an example we will use the same EQ shown on page 29 In rephase use the Paragraphic Gain EQ feature 1 Set filter b...

Page 37: ...lugin 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...

Page 38: ...ic cross feed simulation as described here http bs2b sourceforge net An early reference for this type of cross feed is on Linkwitz Lab 8 10 1 Low pass filter LPF Classic cross feed filters generally i...

Page 39: ...gnal mixed at 6 dB To turn a cross point of the matrix on and off click on it It will switch between Off and the mix level The default mix level is 0 dB i e no attenuation To adjust the mix level at t...

Page 40: ...s disabled when in DSD playback mode 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...

Page 41: ...put is full scale that is it swings between the 1 0 and 1 0 limits At the output conversion the signal is still full scale and the DAC chip will output the maximum specified voltage Case B The EQ stag...

Page 42: ...nservative Set either Input Gain or Master Volume to 6 dB This will ensure that no digital input signal that isn t already clipped will clip at the output stage This approach will always be required i...

Page 43: ...nge it to a high shelf filter Set the gain negative instead of positive On page 29 the filter shown is a low shelf with gain of 4 0 dB Here is the same filter reversed as described above Note that the...

Page 44: ...just click on the desired button 8 12 1 Selecting presets from the front panel 1 Press the control button on the front panel repeatedly until the LED for the desired preset is lit 1 to 4 2 Press and...

Page 45: ...ast connected the connection will happen immediately You will be in online mode when the Connect button changes to a checkmark If you have changed something in the UI since you were last connected you...

Page 46: ...vices DSD DSD64 and DSD128 normal and double rate Digital audio input Mini TOSLINK optical connector 16 or 24 bit sample rates from 44 1 to 192 kHz Analog audio input Maximum input level 1 0 V RMS Sig...

Page 47: ...nloads section of the miniDSP website then extract it on your computer on Windows right click and select Extract All on Mac double click DO NOT DISCONNECT THE USB CABLE OR POWER FROM THE HA DSP WHILE...

Page 48: ...folder of the software download It will have a name like HA DSP_v1 6_up2 bin The version number may be different 5 Click on the Start button 6 You will get a progress bar as upgrade proceeds 7 Once t...

Page 49: ...ange without prior notice 49 9 2 2 macOS OS X 1 Connect the HA DSP to your computer via USB if not already connected and power it on 2 Navigate to the XMOS_Firmware Firmware_Upgrade_Tools Mac folder o...

Page 50: ...e folder of the software download It will have a name like HA DSP_v1 6_up2 bin The version number may change 5 Click on the Start button 6 You will get a progress bar as the upgrade proceeds 7 Once th...

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