IPL M1TLM transmission line speakers in oak finish, these have the mid/bass drivers updated to an improve driver and the crossover has the capacitors upgraded to jantzen, also the rear posts have been upgraded to new better ones. Also added plinths on the bases for better isolation Overall the sound is even more open and clean, very nice speakers with grills, comes with original build instructions for anyone wanting to tweak Collection or can meet somewhere between. These are giving my dynaudio evoke 30 a close run in sound.