Costantino Proietti wrote: ↑
Sat Apr 06, 2019 4:04 am
I use the speaker in the picture, I don't know if it is the right one as it becames hot, but for now it works. For a signal generator I use an app for my smartphone ( Simple tone generator) and an amplifier with a microphone jack.
What are you using for an amplifier? Do you have specs for it? The pic says your speaker is 6 ohms. Most speakers are 4 or 8 ohms and is best if they match the amplifier. Even if they do not match, I don't think the speaker should get hot. Maybe there's a fault in the amplifier?
Do you have a volt meter? Put it on DC, auto mode and measure the amplifier's output terminals with speaker disconnected. You should get close to zero volts. If not, there's a problem with the amp.