I have owned 3 Carvin basses, a R1000 head and 810 cab back in the day. Basses are all well crafted, superb playing basses, with sub-par tone (fixed with aftermarket guts).
To an extent I'll agree with this. I didn't like the tone from Carvin's H50 mini hum-buckers. I felt they were not wide enough for a six string. I installed EMGs into all three of my sixes. The J99s single coils that came with my newest one OTOH, I loved. As I had already Bought the EMGs for that instrument, I built a bolt-on five string from Carvin parts to house the J99s. The result was another superb bass with a great R'n'R tone.
Paul