Hi,
If it has controls for volume, treble and bass that
means it has an
amplifier on board. Maybe the battery is low?
A battery is the proof that you actually have a build-in pre-amp. Therefore
you're right: The battery has to be low.
> Pushing the volume to the max also brings noise
with it.
What kind of noise ? Whitenoise like or a low-frequency noise?
> some kind of impedence adapter
If you have a low-freq noise it could be a ground loop or something.
In your case, a white noise would come from the fact that you increased
the guitarlevel extremly to hear a signal -> Signal to noise ratio != 0 so
you increase the noise level as well.
Best regards,
Sebastian.