SANWU TDA7492P 50W+50W issue

[mohcine]

Hello everyone,

I'm really honored and pleased today to join you guys on this wonderful forum!

I recently bought a SANWU TDA7492P 50W+50W amplifier board from AliExpress to use some old 4Ωx2 speakers with unknown wattage, I powered it with a 3.1mm AC/DC adaptor, 12V-2A output.

The issue is, when I plug the connectors into my two speakers, the amplifier board won't turn on but when I remove just one speaker connector it turns on. I'll include a video that will describe the issue perfectly.

SANWU TDA7492P 50W+50W issue - Streamable

I don't have any experience or education when it comes to speakers technology, so any information provided is much appreciated!

 

[MorbidFractal]

Sanwu TDA7492P + Bluetooth 2.1

Assuming these are the same you probably need a 19V-4A brick to power it. It is likely that the turn on thump is causing your Wall Wart to sag placing the unit repeatedly into reset but when you remove one speaker it has enough juice to get going. YMMV but you are not meant to operate these things without a load.

 

[mohcine]

Thank you so much for your reply.

To be honest, I thought the same since the actual power supply only provides 24W, I'll your advice into consideration and buy another one that will provide 100W.

 

[MorbidFractal]

Thank @Doctormord and give his thread a good read. Not my place but welcome to Diy Audio.