Hook up of Bam w/Merlin speakers

If you have only one source (i.e. CD player), it would work best between that and the preamp (apparently gives a more "juicier and fuller" sound). One can also hook it up into a tape loop if one has that option in their preamp - thus one can at a push of a button switch it in and out of the signal flow. Finally, one can place it between the preamp and the amp itself; thus all signals are going to go through the BAM.
If it is single-ended, you will require one extra pair of RCA type interconnects (it has one pair of input RCA's and one pair of output RCA's) than you currently have now.
As others have mentioned, Bobby at Merlin is always more than helpful.

Regards,

David