tube preamp and bass mgmt


iknow that many will find this question heretical,but are there any tube preamps with bass management ?if so,are any affordable?
moehoward
What do you consider affordable?
$1500 give or take.used.
Don't have a pre with bass management, but do have speakers with bass management, Genesis, and don't know if i could get along without it now!!
Mowhoward in your view what is bass management;would it be like the bass management of a theta casa nova(user selectable crossover types,frequency and phase)?