Audio output drops when connected to a projector

Question

Iron

When connecting an analog cable to a laptop, there is a noticeable drop in the sound level in the connected audio system. What should I do?

Answer 1

Maybe the laptop is trying to save energy?

Answer 2

What is the length of the cord? And the subjective assessment of its manufacturer-quality? (Tru_china\company, etc.)

Answer 3

If the projector, then the length is 70cm, it was included. If audio systems, then 40 cm long, also came in the kit.