Amp/receiver suitable for Bose 251

Hi,

Recently, I got 4 Bose 251 for my restaurant at the beach. I ended up buying a XMP100 to power the speakers. I`m not audio newbie, so I don`t know a lot of it. The results are not what I expected, so how can I get the best performance out of it? Connectig serial or parallel the speakers?

This are the specs:

Bose 251:


  • 10W-200W.
  • 4/8 Ohms.

XMP100:


  • 75W per channel 8 Ohms
  • 50W per channer 4 Ohms
  • 160W 8 Ohms in bridge mode