Wondom Jab5 4 Channel Double Tda7498E DSP Integrated Amplifier Bi-amp Aptx-HD Fir Crossover

[Audiomaniac3]

Great news, I've managed to get FIR file work from android lms server with latest SqueezeDSP update,but putting FIR file to android environment is not that easy

I will copy guide from another user which helped me.

1. In a standard Termux terminal, (just open the Termux app from the Android app drawer) run
pkg install openssh

2. run
whoami
and make a note of the user name that is returned (in my case it is u0_a349)

3. create a password: run
passwd
and follow the prompts.

4. start the ssh server by running:
sshd

Now you should be able to open a remote terminal on a laptop (linux/mac terminal or Windows Power Shell) with
ssh -p8022 username@phoneipaddress
using the username (as retrieved above) and your phone's IP Address, and then enter the password you set above.

Now run
.shortcuts/Advanced/Debian\ Terminal
and you will be in the phone's Debian environment on your laptop.

Next you just need to copy FIR file to your android downloads folder and with powershell, copy it from downloads to impulses folder.

Now in windows powershell type this:

cd storage/downloads

ls

cp FIRfilename.wav /var/lib/squeezeboxserver/prefs/SqueezeDSP/Impulses

and now you should be able to select your impulse file from squeezedsp plugin settings,to make FIR file work,server needs to be restarted.

 

[Audiomaniac3]

I am gonna build portable speakers with jab5 and edifier r1280t,I've ordered everything necessary,18awg 4core cable for bi-amping,cable clips to avoid soldering as much as possible and a 6s 3300mah 22.2v lipo battery.

I want to use this battery,because it is relatively light weight,only 467gramms,it has more than enough discharge current compared to li-ion,so no voltage dropouts,also since I am not using passive crossover,there won't be as much energy lost.Aiyima 6ohm tweeter should be rated for 5watts and Edifier 6ohm bass speaker should be 15watts,but since I won't play continuous sinewave,the overall power consumption while listening to music on moderate volume should be low.Probably 3-5 hours on single charge.

The battery and amplifier will be mounted inside active speaker without coooler,it will get cooling from bass speaker,since it is moving air inside

Charging port will be mounted on back plate,backplate already has on/off button,I will solder cables to it and run 4core cable to the other speaker.

So with this done,I will have portable bi-amp speakers,with Wi-Fi connection and electronics hidden inside,from side it will look like 2 passive speakers are connected to each other,but somehow they are playing music

 

[Audiomaniac3]

I've got stuff I've ordered,soon I'll be testing it.

 

[Audiomaniac3]

It is working,soon I'll upload video

 

[Audiomaniac3]

Okay so,here it is,li-po battery powered Jab5,there is so much output power and it sounds great with 20-24v,I was suggested to use DC step up buck converter to make it sound even better with 32-35v and I actually have 300w buck converter laying around,but for now I think it's not necessary for me.

 

[Audiomaniac3]

Now need to think,how to put all of this inside active speaker and run 5meter 4thread cable to passive speaker.

 

[Audionaut]

Hello @Audiomaniac3 ,
Thanks for introducing and testing.
If I understood you correctly, the module can also be used to activate a three-way speaker, including an electronic crossover, right?
100 / 100 / 200 W

Is it possible to set a Butterworth or Linkwitz filter for the crossover via the software?

 

[Audiomaniac3]

Is it possible to set a Butterworth or Linkwitz filter for the crossover via the software?

Hi,yes you can,jab5 has adau1701 DSP and you can set 8th order LinkwitzRiley if you need to.

 

[Audiomaniac3]

Maybe this would be helpful for other people,problems that I have,esp32 won't boot properly,I tried capacitor between en and ground,capacitor and resistor still no luck, deepseek suggested to use GPIO17 instead of GPIO0 I am using,that should fix boot issue,also pop sound in speakers after esp32 starts working,the problem happens because there is no clock frequency from esp32, I'll try setting some delay on startup and see will this work.

 

[Audiomaniac3]

Miracle,now somehow it boots and works with capacitor, I've entered new value to Nvs editor,have no clue did it help but here it is
pinMode(0, INPUT_PULLUP);

Also since I will use this setup outside my house and I want to have Wi-Fi connection for transferring high bitrate audio,all I had to do is connect my phone straight to esp32 and it showed up in lms server.

 

[Audiomaniac3]

Now I realized that board doesn't fit,so either I make a bigger hole, or remove capacitors and solder them back once amplifier is inside.

 

[Audiomaniac3]

Took me whole day to set things up,but I got it:

 

[Audiomaniac3]

Need to improove my cable management

 

[Audiomaniac3]

DIY voltage meter,the charge meter is not accurate but voltage is

 

[Audionaut]

I think it's great what you make and the detailed solutions you find.
But you can definitely work on the look and quality of workmanship. There is a lot of potential for improvement.

 

[Audiomaniac3]

I think it's great what you make and the detailed solutions you find.
But you can definitely work on the look and quality of workmanship. There is a lot of potential for improvement.

Probably I can paint them and make thermal glue look better on back panel,btw speakers are 7 years old

 

[Audiomaniac3]

While trying to figure out how to make esp32 boot while connected through i2s cable I accidentally broke it,it is heating up and not booting at all, I've tried to find and fix problem,but no luck,so I've ordered another esp32 wrover and esp32 s3 modules.

 

[Azrael]

If I understood you correctly, the module can also be used to activate a three-way speaker, including an electronic crossover, right?
100 / 100 / 200 W

I'm planning something similar. But I have a question about the Bluetooth connection:

Assuming I build two three-way speakers, each of which contains a JAB5, can I configure the two modules so that I can operate the two speakers in stereo via Bluetooth, similar to how it works with Bluetooth in-ears?

 

[Audiomaniac3]

I'm planning something similar. But I have a question about the Bluetooth connection:

Assuming I build two three-way speakers, each of which contains a JAB5, can I configure the two modules so that I can operate the two speakers in stereo via Bluetooth, similar to how it works with Bluetooth in-ears?

Well,as I see it,the only solution would be if output device such as windows PC,could output audio to two Bluetooth devices and each jab5 will receive same signal at same time,only one will be configured to left channel and other to right channel,you can't link two jab5 amps with each other,since they only have Bluetooth receiver module.

 

[Azrael]

I just got off the phone with a very friendly employee from boomaudio.de. He also took the opportunity to tell me the name of the Bluetooth-standard for what I'm looking for: TWS - True Wireless Stereo.

And unfortunately he also had to tell me that the JAB5 does not support it.

That's a real pity.