Aww man, As recent as January of this year, the price of MA900 was hovering around $170~ on amazon and ebay. Now they are almost $300! Is Sony MDR MA900 now officially discontinued? Now I really regret NOT buying a second MA900 so I can experiment with it (removing the resistor, for example)

  7550s is not that expensive if you cross the border http://www.bhphotovideo.com/c/product/758137-REG/Sony_MDR_7550_MDR_7550_Professional_In_Ear_Headphones.html

  Can you do a XBA Z5 vs MDR 7550 (a.k.a. - EX800st) comparison ?

  ex800st http://taiseiko.blog.so-net.ne.jp/2012-02-18 mdr 7550 international http://erji.net/simple/index.php?t1182856.html

  For just 20 more bux you can get EX800ST... brand new. http://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=ex800st&_sacat=0

How does ma900 sound with Foreplay - Long Time by Boston, and how does it compare to MDR Z7 you demo-ed?  

  i forgot the bass test link link, but it's a youtube clip that Lachlan (a_recording) used to to point out the bass flutter issue he had with his MDR Z7 headphone. Thank god my MDR 7550 is flutter-free in the bass region and has good left-right driver matching. the source by the way is...

I ran a bass note test and 24hz is the lowest I can hear (or feel).

  Can you comment on how it sounds with klipsch tips?

Quote:     Quote:     Assuming that MA900 really is the continuation of the mdr f1 heritage.....  MA900 should scale up when fed with 1 watt of class-a power, just like the MDR F1.   http://www.audioreview.com/cat/headphones-home-audio/headphones/sony/mdr-f1/prd_118043_2750crx.aspx  

Any Sony MDR MA900 headphone owners here?   Is Geek Out 1000 an overkill for a headphone with nominal impedance of just 12 ohm like the Sony MDR MA900?

  pls do.   does it fit mdr 7550's nozzle?

    I wonder how MA900 would respond to a 1000mW Class-A amplifier.....   http://www.amazon.com/Geek-Out-1000-Headphone-Amplifier/dp/B00JD0CV3M/ref=sr_1_1?s=electronics&ie=UTF8&qid=1417559379&sr=1-1&keywords=geekout+1000   ... hope I can post my impressions in March 2015! 

  Do you mean missing "hearing all that goodness" of 30-50hz ?   I think that range is meant to be felt... ideally throughout the body...  and not just locally to your head.     ----- also, I think the ma900' sub bass and others like it becomes a non-issue when augmented with SubPac.  In...

  MA900 starts falling off the cliff @ 50hz.... and that's already subwoofer territory.   In the near future I think it would be smart for (open, non-planar) headphone makers to just outsource all that sub bass frequencies to clever devices like this   http://thesubpac.com/