Linn Isobarik PMS

I think that is "DMS" regardless of what time of the month it is and as Unsound pointed out this match is the very definition of PRAT in the past. Naim being the amp of choice for the Linn speakers long before they started production of their own. Happy Listening!

DMS = domestic monitor system
PMS = professional monitor system

I'm not sure if the differences were purely aesthetic (ala ATC) but they were two distinct speakers.

The DMS models came with a passive crossover, the PMS models had no passive crossover with them and were intended to be used with Linn's Aktiv crossover and three amplifiers. Other than that they were the same speakers. I started with a pair of DMS and a single amp and then upgraded to the Aktiv setup. I love mine and if I ever had something happen to them I'm sure I'd try and find a used pair to replace them.