Nightclub S OM, Ortofon Nightclub S OM's are the top of the line in the range, the Night Club gets the highest mark for sound quality. It has become the high-end industry standard for club djs and studio workers with an excellent reputation for performance and durability. Output is 5.0mV with a frequency response rating high enough to compare the Night Club to audiophile cartridges. If your main focus is sound with minimal scratching, these are the best cartridges on offer.