Don't know, but a google search turned up this site. They must make great speakers, the audio sounded first rate even on my PC speakers

http://www.martendesign.com/english/index_eng.html


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8