HR-S8600EU low audio output level? (JVC VCR)

[Tomas84]

Hello.
I have bought used JVC HR-8600EU(seems to be similar model to HR-S9600U). I had HR-S7700EU before and when I compared these two machines I noticed that 8600EU has lower level of audio output. It seems to be less "sharp" in audio, the sound is "dull" or "lifeless" . Is it normal or some malfunction? Is there a way how to fix it?

Thanks.

[volksjager]

do you have the audio set on normal or hi-fi?
is it the same with all tapes?