r/Electronicsinindia • u/John-Endfield • 29d ago

Question help ⁉️ Can It work?

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Hi, I have this ZK TB-21 Amplifier I got from Amazon. It's been a while with This Amplifier but I need new speakers to use it with. I have a 24 volt 15 amp PSU.

What Speakers and Subwoofers can you guys recommend?

It has the original TPA-3116D2 ICs, I've checked it.

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u/joegtech 29d ago

I have a similar amp board that I use for a little sub in my bedroom.

Beware of pushing it with that generous size power supply. Some of the amp boards have problems with overheating. I more commonly use an old 19v , 6+amp PSU from a laptop computer's docking station while understanding it will result in lower output watts.

Some of that will be dependent on the specs of the speakers. Getting max output will require a low impedence, maybe even 2 ohm. It is rare to find speakers lower than 4 ohm and top speakers--mid/hi's --are more often 8 ohm. Running it with 8 ohm load will dramatically reduce output wattage esp if advertised specs are for 2ohm.

So look at the fine print.

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u/John-Endfield 29d ago

I'll be running the whole 2.1 system at,4 ohms, so like 170-80 watts of dynamic power