Many of the musicians that had played other EUBs tell me that
they often sound more like a fretless-bass than a double bass.
That's because they have solid bodies. This becomes clearer
when we look at the bridge: the bridge stays on a solid base
that does not allow bigger movements. It is easy to understand
that small vibrations produce higher frequencies and big vibrations
produce lower frequencies. The sound of a solidbody instrument
will have all the bright overtones but not the big bassy sound
that's so typical for double basses.
shows how it's possible
to make an instrument with reduced dimensions but the BIG
sound of a double bass!