Bluetooth Device

[UegalRI]

Hello,
I recently developed a dedicated Bluetooth interface for my Devialet Expert system, and I'm exploring the idea of offering it to others in the community.
The unit connects via SPDIF for digital audio transmission and uses RS232 to control key functions such as volume, power on/off, and source selection—fully integrated with the Devialet protocol.
At its core is a Qualcomm Bluetooth 5.3 chipset, from the latest generation of audio SoCs. It supports a wide range of high-quality codecs, including SBC, AAC, LC3, and notably aptX Lossless.
The enclosure is compact, plug-and-play, and designed specifically for Devialet D-Premier, Expert, and Expert Pro models.
The estimated price would be around €300.
Before moving forward with a production batch, I’d like to gauge interest. Would anyone here be interested in such a device?
Happy to answer any technical questions — and thanks in advance for your feedback.

Val

[audio_engr]

Hi Val,

Heartiest Congratulations on developing your Bluetooth device for users like me having my 440-Pro CI. Here are a few queries I have as below:

1. I'm only interested to have control of the VOLUME via your Bluetooth. [ I have no desire for digital audio transmission, Power On/Off or Source selection ]. 

2. How would your device connect to my Dual 440-Pro to provide me control of my Volume levels ?  Please elaborate on the wiring connections requirement.

Thank you

- Arup

[Greg]

Hello,
I recently developed a dedicated Bluetooth interface for my Devialet Expert system, and I'm exploring the idea of offering it to others in the community.
The unit connects via SPDIF for digital audio transmission and uses RS232 to control key functions such as volume, power on/off, and source selection—fully integrated with the Devialet protocol.
At its core is a Qualcomm Bluetooth 5.3 chipset, from the latest generation of audio SoCs. It supports a wide range of high-quality codecs, including SBC, AAC, LC3, and notably aptX Lossless.
The enclosure is compact, plug-and-play, and designed specifically for Devialet D-Premier, Expert, and Expert Pro models.
The estimated price would be around €300.
Before moving forward with a production batch, I’d like to gauge interest. Would anyone here be interested in such a device?
Happy to answer any technical questions — and thanks in advance for your feedback.

Val

Hello Val,

I am also very interested. I would also like to know a little more about the wiring and how it works in practice, for instance, my interest would be streaming Qobuz connect straight to the Devialet dac. Also, how much user programming would be required? I am of that generation where such things digital can be a challenge. Look forward to your update.

[mbd]

I’d love Devialet to release more info about their API so that better remotes could be made available. €300 may be more than I’d be willing to spend, but it may also depend on what the unit would do, and how it would be available for interactions/automation, etc. keen to hear more.

[UegalRI]

Hi,

 How would your device connect to my Dual 440-Pro to provide me control of my Volume levels ?  For Dual 440 Pro systems, connection is supported. Volume control is available only during playback.

how much user programming would be required?  : Source switching is automatic: just name the SPDIF input "Bluetooth" and enable RS232 control

I use this documentation :  http://www.devialet.com/docs/Automation-...notice.pdf

The interactions between the Bluetooth module and the Devialet are as follows:

• Volume control (synchronized both ways: from the phone to the Devialet and vice versa)
  
• Play on the phone automatically powers on the amplifier and switches to the correct source
  
• Pause is triggered when you change the source or turn off the Devialet
  

Bluetooth Module Devialet Connection Diagram 
   

Regards,

[Greg]

Hi,

 How would your device connect to my Dual 440-Pro to provide me control of my Volume levels ?  For Dual 440 Pro systems, connection is supported. Volume control is available only during playback.

how much user programming would be required?  : Source switching is automatic: just name the SPDIF input "Bluetooth" and enable RS232 control

I use this documentation :  http://www.devialet.com/docs/Automation-...notice.pdf

The interactions between the Bluetooth module and the Devialet are as follows:

• Volume control (synchronized both ways: from the phone to the Devialet and vice versa)
  
• Play on the phone automatically powers on the amplifier and switches to the correct source
  
• Pause is triggered when you change the source or turn off the Devialet
  

Bluetooth Module Devialet Connection Diagram 


Regards,

Thanks, Val. That all looks and sounds pretty good.

Another question, please. What sample rate does it operate on? Thanks.

[UegalRI]

The sample rate is 44.1 kHz. I can test at 48 kHz, but I'm not sure if it's compatible with the AAC codec.