I have a Berning ZH270 and until recently ran my two sources (cd & TT) directly into it. I just acquired a Bent Audio transformer volume control (tvc), which to me sounds better than using the Berning volume control. The tvc has minimal sonic signature of its own, and would allow you to use the BAM with multiple sources intputs and it should sound the same as though it were in between a source and active preamp. Budget about $1000 to $1500 for the tvc, depending on configuration (which is set up for what you need - i,e number of inputs and outputs, balanced or single ended, etc.).
This is, of course, a different approach from using an active preamp. I don't use an active preamp because I don't need the gain - a cd source has plenty of juice for the Berning to drive, and the right comnbination of phono stage and cartridge should also give you plenty of juice. In my opinion, the Berning sounds just fine on its own and I have felt no need to try to match it to an active preamp. That is not to say that the right active pre would not sound great, but I suspect the cost would be pretty high to get the quality to compete with the tvc.
So, this is an alternative that would allow you to spend between $2000 and $2500 on a separate phono stage in addition to the tvc.
This is, of course, a different approach from using an active preamp. I don't use an active preamp because I don't need the gain - a cd source has plenty of juice for the Berning to drive, and the right comnbination of phono stage and cartridge should also give you plenty of juice. In my opinion, the Berning sounds just fine on its own and I have felt no need to try to match it to an active preamp. That is not to say that the right active pre would not sound great, but I suspect the cost would be pretty high to get the quality to compete with the tvc.
So, this is an alternative that would allow you to spend between $2000 and $2500 on a separate phono stage in addition to the tvc.