Well, these are a little tough to find but they are well worth the search and wait. The Monsoon Planar 9's are absolutely phenomenal. These things soundstage, image, do relatively deep bass, deliver plenty of detail and are absolutely non-fatiguing. I started out with their old MM-700's and cooked one of the ribbons and I decided to upgrade to the Planar 9's. The 9's are significantly better than the MM-700's.
As I'm told, these little ribbons are the same ribbon (in unmodified form) as the VMPS ribbon so many people love. Their crossover point is somewhere near 200Hz. These little jewels will do nearly 100db at 3 foot. Thats more than enough to pin your ears back. They are self amplified so all you need is a patch cord from your audio out to the Monsoon's. Oh, they do have an adjustable bass volume control for use when needed.
I've listened to quite a few different 'computer' monitor speakers, from the cheap to the expensive and these are the best I've heard to date. In fact I have two pair, one at home and one at work. I listen to the ones at work literally all day (Foobar FLAC's or Pandora).
As I mentioned, these are tough to find as they stopped making them about 3 or 4 years ago. eBay is probably your best bet. They are well under $100 used. I paid $129 new and $69 on closeout for my second set. Happy hunting
