Hi Graeme ,
Well , i find the neo 410 much louder and giving more bass than the proline 410 . I also have 2 proline 410 that are really great but so heavy to carry and regarding the sound , i find it much defined , clearer , but not as punchy as the neo...so when i have big gigs ( not the pubs ) i use my neo on the floor and the proline at the top , so i have a super-efficient combination ...but that's just my opinion...
Alain