amplifer supply

[Goozo]

Hello
I have 2 amplifiers, one for stereo
One for the subwoofer, which has a low-pass filter
Both are 12 volts
It is not a problem as long as they have separate power sources, but if these two amplifiers are connected to one power source (battery).
When I connect it, the subwoofer does not turn on and it hisses. Now I want to get two outputs from one power source (battery) so that these two amplifiers are separated. Is this possible? Thank you for your help.

 

[Harald Kapp]

What kind of battery?
What are the specs of the amplifiers in terms of power?
The battery may simply not suffice to supply enough power for both amplifiers and the battery voltage will drop to a level too low for the subwoofer's amplifier to operate correctly. Can you measure the battery's voltage under load?

the subwoofer does not turn on and it hisses.

When it hisses, it at least tries to turn on.

You can try to add a big electrolytic capacitor across the supply pins. e.g. 1000 µF 16 V or higher. The capacitor may be able to supply peak current and thus aid the battery in keeping the voltage up.