I own one of the older K6's. It has a chambered body and the kent armstrong pickups. My bass has a definite growl. the preamp is very hot, but i tamed that by turning down the trim pot on the preamp itself.
the Bassmods preamp is powerful and a little adjustment makes a huge difference. i almost always turn the bass control down a little and the mids as well. due to the nature of the humbuckers, i run the treble up a little bit from the center detent.
I have found this bass to have very usable tones whether playing slap or fingerstyle. I use it in church almost every week and have had zero issues. sits very well in the mix.
I read your review on the other thread and have to say i am quite surprised by the workmanship on the bass you received. and yes, you are correct, Rob is fantastic and very responsive.
I have recommended the Bassmods basses quite often and will continue to do so. i think they are an amazing value for the money.
Christian Praise and Worship Band Club Member #499, Wisconsin Bassist #37