I'd put more of a fair comparison between the Sonus and Quantum series.
Those are more of the "flagship" I guess you could say designs of both, where as the Flea is what it is-
a signature model bass built to one man's specs that now we all get to enjoy!!![]()
Hmm...interesting point.
Having owned the Flea and 3 Quantum 5's, I'd say you could call the Quantum the "flagship" bass, but it has nothing on the Flea in terms of quality. Just different...different form factors (scale/# frets/body) with the Quantum being more clear/deep/versatile and the Flea being more middy and aggressive.
By the way...I think the Legacy would be considered the Zon flagship, wouldn't it?
Anyway, I guess I'm comparing 4 strings here, and IMO, the Sonus 4 has more in common with the Flea 4 than the Quantum 4. The Q4 is 35" with pretty wide spacing, which is enough for me to dismiss it out of the gate. I really don't dig 35" on a 4 string...
I also wouldn't call the Flea bass a highly customized signature bass. There were a few modifications to the Sonic Hammer, but overall, it's pretty similar, IMO. Have you noticed big differences?
I would love to A/B the Flea 4 J and the Sonus or the Modulus VJ.