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ADAU1701 Audio Digital Signal Processor Kernel Board - APM2[658]

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In-Circuit Programmer for ADAU1701 Digital Signal - ICP1



Interface Extension Kit



WONDOM In-circuit Programmer with BLE Bluetooth for APP control - ICP3




APM2 (AA-AP23122) is a 2 x in, 4x out DSP kernel board based on high performance chip – ADAU1701. With the integrated DSP chip, APM2 can be applied to various DIY audio, commercial or industrial applications such as digital crossover, bass enhancement, loudspeakers, kiosk, etc. After connection with WONDOM programmer – ICP series, APM2 supports programming with SigmaStudio, remote control through APP or PC UI.

Miumax Download link for Android Phone: video link

Miumax Download link for iOS Phone: Please go to APP Store and search “Miumax” directly.

Demo Program for Reference: video link

Video for adding DSP to your audio systems: video link

Video for programming and APP Control of APM2 with ICP3: video link

Easy Connection and Quick Integration

APM2 comes with a necessary demonstration firmware, so you can use it in your audio systems directly with no need of programming. A 2 x in, 3 x out Interface extension board – APM3 is provided for easy audio connection, which offers multiple kinds of interfaces, including RCA jack, 3.5mm AUX IN jack and PH-4Pos line input connector. After connection with APM3, APM2 can be easily integrated into any projects, such as Kiosk, Speaker Equalization, Active Crossovers, Digital Car Audio System, Home Theater, Karaoke, Musical Instruments and so on. APM2 and APM3 are both in 2’’ x 2’’ compact size, making them simple to be installed in any cabinet without occupation of too much space to leave enough headroom for other components.

High Performance ADAU1701

The on board fully programmable 28-/56-bit audio DSP ADAU1701 from Analog device is competent in various signal processing applications. This process can compensate for real-world limitations of speakers, amplifiers, and listening environments, providing dramatic improvements in perceived audio quality.

Four potentiometers are provided on APM2 for real time hardware control of the whole audio system for volume, gain and cut-off frequency setting.

Supporting SigmaStudio Program and Remote Control

Different applications have unlike requirements on audio as the speakers, the environment and the preference are different. To give customers better control of audio systems, Sure Electronics has released In-circuit programmers (ICP series), with connection of which, you can program DSP with SigmaStudio or remote control the system with APP or PC UI.

We have developed an APP – Miumax for remote control, with which, you can adjust volume, gain, frequency and EQ setting. PC UI is also available for different applications as digital crossover, bass enhancement, subwoofer, and so on.

Sure Electronics has provided open-sourced files for customers to start the project quickly. Please refer to the in the “Download” part.

Package Includes

1pc AA-AP23122, ADAU1701 Kernel board

  • 28-/56-bit, 50 MIPS Digital Audio Processor
  • Fully Programmable with SigmaStudio Graphical tool
  • SNR of 100dB, THD + N of -83dB
  • Hardware Adjustable with 4 potentiometer on board
  • App Control Supported with WONDOM ICP3
  • Powered by 5V micro USB
  • 2 x 2 inches Compact PCB Size
  • Speaker Equalization
  • Active Crossovers
  • Digital Car Audio System
  • Home Theater
  • Karaoke
  • Musical Instruments
Miumax V2.0 has been released. Following are the download address. For Android: http://store.sure-electronics.com/images/documents/Miumax_v1.0.1_2020.6.22.apk For iOS: Please go to APP Store and search 'Miumax' directly.Demo Program for Reference: https://store.sure-electronics.com/images/documents/APM2_SigmaStudio.zip 



13 Aug 2021

Are pins 2, 3 & 4 of the micro USB connector used for anything? I would like to power this with a DC-DC buck converter and USB cable using only pins 1 and 5 (+5v, GND)? Thanks.

Hello, Logan. Pin 2, 3 & 4 of the micro USB connector are not defined for any function. You can just use pin 1 and 5 for power. Wish this could help you. Have a nice day.


07 Jul 2021

Hey, just received my APM2. its connected to my trebble amp and speakers and works fine on that side. However, i connected it to my 500 watt class D amp board for my sub through the sub outpout and this isnt working. My sub doesnt seem to be picking up any signal. Any reasons why this could be happening?

Hi, camille. Please kindly check the following issues. 1. Check if there is signal output from APM3 sub channel 2. Check the settings of potentiometers 3. The maximum output of APM2 is around 1Vrms. Check if the input sensitivity range of your sub amplifier matches with the output. If possible, please send us some pictures or videos to show us your connection and the problem so that we can solve it for you.


15 Jun 2021

Hello, for S/PDIF (optical output), should I use the WM8804 S/PDIF AND IIS/I2S AUDIO SIGNAL TRANSCEIVER [744]? And send I2S signal from ADAU1701 to WM8804? Or what any other solution is there for optical out? Thank you! :D

Hi, Andrei. Thank you for your interest in our products. We can use APM2 and WM8804 converter board to get S/PDIF output. First, we need to get I2S output from APM2. Since the WM8804 converter board is master mode, so we need to set APM2 as the slave mode. Please kindly take the following steps. 1. remove the crystal oscillator on APM2 and connect with MCLK on WM8804 converter board. 2. Set the GPIOs of APM2 for I2S output as shown in the attached picture in SigmaStudio; 3. Connect the corresponding positions. The MP0 of J4 on APM2 is corresponding with DAT. The MP4 of J4 on APM2 is corresponding with SCK. The MP5 of J4 on APM2 is corresponding with BCK. Also connect the GND please. The following link is an instruction on how to achieve I2S input & output with JAB3. You can take it as a reference. https://store.sure-electronics.com/images/documents/How%20to%20achieve%20I2S%20input%20&%20output%20with%20WONDOM%20JAB3.pdf Wish this could help you.


27 May 2021

Hello, I just received the APM2 product and J2 power connection is NOT a Micro USB port - It looks more like a USB-C port. The ICP1 programming board at J1 does have a Micro USB port while this APM2 does not. Can you please tell me what cable I need to power the APM2 board as the instructions appear to be incorrect. Thanks.

Hi, Steven. We have changed the power supply jack of APM2 to USB Type-C port. So you would need a USB Type-C cable to power the APM2. We will revise the instructions on the website. Wish this could help you.


24 May 2021

Can I achieve 2 input x 6 output (high, mid, sub crossover) using 2 APM2 and 2 APM3? Like 1 APM2 and 1 APM3 for left channel, same for the right channel?

Hello, Francis. Thank you for your interest in our products. Yes, you can build the system as you mentioned. Please note that, you need to revise the program on your own. Wish this could help you.


09 May 2021

Can the crossover slope be programmed from 3db/ octave to 24 or 48db/octave? Also can I use it to for a 0.2 setup? i.e dual subwoofers independently controlled?

Hello, Martin. Thank you for your interest in our products. You can change the program according to your requirements through Sigma Studio. Here is a link you can visit for help if you have any problem. https://wiki.analog.com/resources/tools-software/sigmastudio Wish this could help you.


29 Apr 2021

what order is the crossover? or what is the slope in terms of dB/octave?

Hi, Martin. The crossover we employed is the first order filter. The slope is -3dB. You can download the demo program of APM2 for reference. https://store.sure-electronics.com/images/documents/WONDOM%20ICP3%20User%20Guide.pdf You can find the demo program in the file above. Wish this could help you.


04 Mar 2021

Hi, I need 4 x Inputs (2 x Stereo Sources with automatic priority switching between them) and 3 x Outputs. Is it possible to use 2 x APM2 and run "Control Signals" between the boards using the GPIO Pins? As 1 x Stereo Source will be Bluetooth could I use 1 x AA-JA32474 plus 1 x APM2 and auto duck the APM2 Output using a "Bluetooth connected" GPIO from the Amp Board?

Hi, Andy. Thank you for your interest in our products. 1. Yes. The solution you mentioned is feasible. You need to write the program with the SigmaStudio. 2. Yes. It's feasible too. You can get the Bluetooth status through the Pin 39 of the Bluetooth module. Wish this could help you.


17 Feb 2021

What is the maximum audio output voltage for APM2? Is it a good match to the input sensitivity of the 300W/500W amp (sku AA-AB33511)?

Hi, Michael. Thank you for your interest in our products. The maximum output voltage of APM2 is 0.9Vrms. You can adjust the output voltage in the SigmaStudio. Wish this could help you.


06 Jan 2021

Hi this dsp can setup delay

Hi, Somlis. Thank you for your interest in our products. You can set delay through the SigmaStudio. The delay time can be set as 3-5ms, which is up to the how many the remaining resources are. Wish this could help you.

Robert G.Johnston

23 Dec 2020

I have the "ADAU1701 Audio Digital Signal Processor Kernel Board - APM2[658]" and need the circuit diagram to be able to understand it's function and make use of it. Where can I download the circuit diagram? Thank you for your help Bob J.

Hi, Bob. Thank you for your interest in our products. Here is the manual of APM2 and APM3. You can find the pin definition in it. http://store.sure-electronics.com/images/documents/Digital%20Signal%20Processor%20Series.pdf As for the required program and application notes, you can find them in the 'Download' part in the product page. Wish this could help you.


20 Dec 2020

Hi, I’m going to use the ADAU1701 board without the APM3 interface. I would like to avoid SMD ceramic capacitors on the signal path, and use external decoupling film capacitors, directly connected to the analog inputs (ADC) and analog outputs (DAC) of the ADAU chip; the question is: can I access directly to the analog input/output pins of the ADAU chip via J3 connector? Thanks, Fulvio

Hi, Fulvio. Thank you for your interest in our products. You can input audio signal through J3 and J4 ports, which are directly connected with ADAU1701 pins. Please note that it is required to add coupling capacitors for audio input and output. In addition, 18k resistors is needed to be added after the coupling capacitor for audio input ADC0 and ADC1 to determine the input sensitivity. Wish this could help you.


05 Nov 2020

How is the board powered? Can I just power it via the micro-USB connector, eg using a power bank? Or can I power it directly off the amplifier, eg an AA-AB35511?

Hi, Michael. Thank you for your interest in our products. The APM2 is powered by DC5V via micro-USB connector (J2) and it cannot be powered by the connected amplifiers. Wish this could help you.


06 Oct 2020

Hi, is it possible to link two AA-AP23122 and control them in sigma studio in one project simultaneously (master-slave?), I need 5 outputs for one system :( and is it possible to recall different created presets via (IR) remote control, a switch or your APP?

Hi, Jack. Thank you for your interest in our products. You can add a DAC to APM2 to get 5 x outputs. We are developing new APM products which can provide multi-channel outputs. Please stay tuned. You can control the APM2 with APP after connection with ICP3, through which, you can adjust the volume, gain, frequency settings and EQ. Here is the video for your reference. https://www.youtube.com/watch?v=-wOcJUeXEUY Please kindly note that there are no presets in the APP. Power-off memory function is equipped in ICP3, so ICP3 can save your last adjustments.


23 Aug 2020

can you use it as a crossover for a tweeter and a subwoofer/woofer

Hello, oscar.. Yes. You can use it as a crossover for a tweeter and a subwoofer. Wish this could help you.


20 Aug 2020

Hi there, Would the Dsp apm2 blow up when fed with a signal from an amplifier? How is it possible to use all 4 outputs of the apm2? Are there special cables going from the board to RCA or similar? And I don’t mean the Apm3.

Hi, Paul. Thank you for your interest in our products. Please kindly be noted that the maximum audio input voltage for APM2 is 1Vrms. If you want to use all 4 output of the APM2, you can lead out the "OUTL1", "OUTL2", "OUTR1" and "OUTR2" of J1 on APM2. The cables need to be customized and there would be MOQ. Wish this could help you.


05 May 2020

Hello. If I understand the product correctly, there are 2 input channels and 3 output channels. According to the datasheet, the ADAU1701 has 4 output channels. Is it at all possible to use the 4th output channel on this board?

Hello, geppa. Thank you for your interest in our products. Please kindly be noted that the APM3 is a 2-in, 3-out interface board. It provides RCA, 3.5mm headphone and line output ports. But they cannot be used at the same time. Wish this could help you.


26 Apr 2020

what is the name of connector J3 and J4?

Hi, baptiste. Thank you for your interest in our products. The connector used in J3 and J4 is low-profile polarized 20pos-2.54mm header. Wish this could help you.


03 Feb 2020

The device hast 4 Outputs. What are the differences between the one near the input and the others?

Hi, Uwe. Do you mean the difference between the 3.5mm output and RCA output of APM3 (INTERFACE EXTENSION KIT)? They are both for audio output and they are parallel connected. Please do not use them at the same time. Wish this could help you. Any question, please feel free to contact us.

Peter Ricardo.Poulsen

14 Jan 2020

Hi. What is the power consumption of the APM2 board?

Hi, Peter Ricardo. The power consumption of APM2 is around 1W@DC5V in normal work condition. Wish this could help you.

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