I was talking to the bass guy at a shop that asked me if I used the ELF with my Bag End speakers. He told me that the Bag Ends are designed to work strictly with their ELF. He tried to tell me that there is a problem with time alignment if you don't use the ELF. I know that this was a pile of dooky. I didn't dispute him as I was wanting to give the Aguilar preamp and the Alembic FX-1 a try out that they had. I know what time alignment is and don't find this to be a tonal problem, at all. Is there something that I'm missing here? I guess I should read up on this. When I'm using my BE's it's either the single 15" or the pair of 10's alone. Both cabs are awesome and handle lots of power without raising a beed of sweat.