TWS Amplifier

[audio_04]

Hello everyone,

I am aiming to build a stereo 2-way speaker system, using a fully active crossover approach. To achieve this, I’ve selected the Wondom JAB3 (2x50W) because of its integrated ADAU1701 DSP, which allows me to program the crossover frequencies and EQ filters via SigmaStudio.

The Setup:

• Amplification/DSP: 1x Wondom JAB3 per cabinet (running a woofer/tweeter split).
• Power: Battery-powered (BCPB series) for full portability.

The Question: I need a Bluetooth receiver module that supports True Wireless Stereo (TWS) to link both cabinets wirelessly. I am looking for a module that:

1. Supports TWS mode (Master/Slave pairing for L/R separation).
2. Provides a clean analog line output to feed the JAB3’s Aux Input.
3. High-fidelity audio.
4. Doesn't have an integrated amplifier (since I only need the line signal for the JAB3).

Does anyone have experience with boards that are reliable for TWS pairing and play well with the Wondom ecosystem? I want to avoid ground loop noise and latency issues between the two units.

Thanks in advance for your help!

 

[staticV3]

The Wondom JAB2+ or Up2Cast Amp have everything on one board: Bluetooth TWS, DSP crossover, and two channels of amplification for the woofer and tweeter.

 

[audio_04]

The Wondom JAB2+ or Up2Cast Amp have everything on one board: Bluetooth TWS, DSP crossover, and two channels of amplification for the woofer and tweeter.

Actually I wrote to sure-electronics for more information and this is what they told me:

"JAB2+ does not feature crossover filtering.
Our new product JAB6 supports both TWS and crossover filtering. Please find the product introduction attached.
The first batch is scheduled to be available by the end of May."

The thing is I need it sooner than that.

I also wrote to SoundImports suport and this is what they told me about the Up2Cast Amp:

"I’ve looked into this further, and it turns out that the Up2Cast AMP does support basic DSP functionality via ACPWorkbench. This includes features such as EQ adjustments and some signal tuning options.

However, please note that while these DSP tools allow for basic sound shaping, the module still does not provide a fully featured built-in crossover for a true active 2-way setup (woofer/tweeter split). For that type of configuration, you would still typically need an external DSP or crossover solution."

 

[staticV3]

Actually I wrote to sure-electronics for more information and this is what they told me:

"JAB2+ does not feature crossover filtering.

My mistake on the JAB2+, I missed this small note on the website:


Since you cannot program separate EQ parameters for each channel, a 2-way crossover is not possible.

The Up2Cast Amp supports this however:


And ACPWorkbench definitely includes Low pass/High pass filters: Link

So not sure what is supposedly missing to make this a "fully featured crossover"

 

[audio_04]

I have been exploring different amplification options and came across a manufacturer offering some interesting amplifier boards that integrate amplification, programmable DSP, and Bluetooth connectivity with TWS support. This allows for a kind of “party mode,” where multiple boards (and therefore multiple speakers) can be wirelessly linked together.

In particular, I found a model that provides 2 × 50 W at 4 Ω. My idea would be to use one board per speaker and implement the crossover in the internal DSP (LPF for the woofer and HPF for the tweeter).

My question is the following: the woofer I have selected has a nominal impedance of 8 Ω, so according to the amplifier’s datasheet, the actual available power in that channel would be around 30 W instead of the specified 50 W at 4 Ω.

On one hand, I have done a rough calculation and those 30 W, combined with the driver’s sensitivity, should allow reaching around 100 dB SPL, which is within the target defined in my project. However, I am unsure whether this is an adequate design choice, since the driver would not be operating close to its nominal RMS power.

Would you consider this solution appropriate, or would it be better to look for a higher-power amplifier stage for the woofer?

 

[staticV3]

since the driver would not be operating close to its nominal RMS power.

Drivers don't have nominal power.

They have maximum power above which damage can occur.

Below that, any power level will make the driver function normally, with the playback volume as the only factor.