Take your Kemper into a store that has a good selection of PA/FOH gear.
You'll find a lot of FOH gear is ideal for modeling.
Don't limit your self to to gear targeted just for "bass".
Yamaha, JBL, QSC ... all have excellent products, at competitive prices, and easily scale up. For a bass a single top and a good sub can go a long way. And don't forget these kind of products are going to provide actual measurements and graphs for you to compare before you go to the store.
Greenboy designs are probably the only exception here for targeted to "bass", they do also have actual measurements.
You'll find a lot of FOH gear is ideal for modeling.
Don't limit your self to to gear targeted just for "bass".
Yamaha, JBL, QSC ... all have excellent products, at competitive prices, and easily scale up. For a bass a single top and a good sub can go a long way. And don't forget these kind of products are going to provide actual measurements and graphs for you to compare before you go to the store.
Greenboy designs are probably the only exception here for targeted to "bass", they do also have actual measurements.