Question about the lowest octave of the marimba (VI and Synchron)

[Andreas 1]

I have a question about the character of the lowest octave on the marimba, especially the difference between the VI marimba and the Synchron marimba. As the question also touches on instrumentation technique, I have posted it here:

https://forum.vsl.co.at/topic/61745/question-about-the-lowest-octave-of-the-marimba/1

I would be delighted if someone could help me!