Long time lurker, first post. Got bit by the audio bug back around 1973. I recently picked up a set of 878B Santiagos. I also have a set of 511B horns with 808-8A drivers + N501-8A crossovers. I like to listen to classic rock loud. This set up will go into my garage/man cave. What changes should I expect if I swap the 511 for the 811 horn + crossover?

I am spinning vinyl. Amps include: Crown K2 (strictly bass LF duty), Hafler 9505 (2) SS, homemade 2A3 SET. Pre-amp is a homemade tube 12A7. I also have a Rane 22 active crossover a Bozak N106B active crossover (6 db slope) leftover from my Concert Grand speakers. This was modified from 400Hz to 500Hz crossover freq. I have a pro EV 18" sub I can throw in the mix.

Anyone have experience bi-amping these units? Should I keep the Santiagos original and stack the 511B's on top? Thanks in advance for your responses. I have enjoyed reading the great advice from all you regulars.