Is it true that the PS5 has problems with the volume (system volume)?

Is it correct that the new console is louder than its predecessor when using it?

I'm not an expert but the Ps5 should be quieter than the Ps4. So I'm talking about the "normal" the digital edition should be even quieter than the "normal".

No, the new generation should be very quiet after initial tests. Much quieter than its predecessor. No matter which version, the one with the drive should be slightly louder.

In short: no, that's not true.