I think the speaker name should follow the naming convention since they are M3s under the rugged exterior :-). My recommendation,
1) "External Installation Friendly" shortened to "EIF". So, M3EIFv2 or M3v2 EIF
2) "External Friendly Generation" shorthened to "EFG". So, M3EFGv2 or M3v2 EFG

Behringer 1030A, SVS PB-12 Ultra, Etymotic ER-6i
PS3, SGT 10.1, Sansa Clip
Auralex