What is the difference between both of these?

I am pleased with my M50, but I am curious about the 900.  Can anyone who has heard both give me a comparison?  There is a significant price difference between the 2.  I am wondering if the pro 900 is worth it over the M50.  I listen to mainly tech house, progressive music.  Thanks.

http://www.musiciansfriend.com/   or   http://www.rmcaudiodirect.com/default.asp     Are either of these stores authorized Ultrasone dealers?  Has anybody had any expereince dealing with either of these places?  Any advice or personal experience would be great.  Thanks.

I went to there site but there is no mention of it.  Does anyone know?  Thanks.

I just heard the BeyerDynamic DT770 pro 80 ohm headphone.  I heard it at a local guitar center and they plugged it into some kind of complicated mixer that had a headphone port.  The mixer had about a million dials and what not.  Anyways, I really liked the sound but felt it needed to be...

I am assuming the audio techinca has a house sound and the M50 have them?  If I liked the M50 and wanted a noticible and significant upgrade, what should be my next audio technica can?

I am pretty new to high end audio and I need some help.  I need a good source which gives me great audio quality from my Cds.  I think I want to have a standalone unit instead of using my computer.  Should I be looking at receivers, cd players, blueray players, dvd players, what?  I am...

Well, I am pretty new to the world of headphones and hi end home theater.  I never knew headphones could sound so good so I am now hooked.  A few months ago I needed cans for work, so I got the ATH-M50s to use straight out of my ipod.  It was a great purchase.  I love these headphones and the...

Guys,    What is the proper way to set the volume levels?  I have a simple setup right now and I have a source hooked up with a amp and then my headphones plug into the amp.  What is the proper way for me to set the volume?  Specifically I have 2 questions:   1.)  Do I set the volume of...

I am just starting to get into this hobby.  Right now I am using my Thinkpad T500 as my source along with my Desktop's integrated sound on the MOBO.  I just bought a HD650 and a SS amp.  I want to connect my amp to these sources and I was told I need a 3.5mm to RCA cable.  Is this the best way...

Which one of these would be the best with the Sennheiser hd650?  What are the pros and cons of each?  Thanks.

I am very new to headphones in general and have been reading a ton of threads on this forum.  I read a lot of good things about the Gilmore lite amp.  When I went to their site they say that it is permenantly sold out?  SO thats' it?  What is the replacement model?

Hi guys. I just got my ATH-M50s cans and really love them for the price I paid for them, but they are being used just for work. I am planning on doing a decent level system at home with a good source, amp, and cans. I am thinking I want to do the Grado RS1i or Sennheiser HD600. The thing is...

I just wanted to to do a little informal review of the Audio Technica ATH-M50 headphones to help some people new into the highend headphone world like me. So hear goes...... Overview: I wanted a set of good cans for work so I needed them to be closed, as I couldn't deal with much noise...

I am basically looking for the best closed can I can get for under $75. I will be using it directly with an IPOD Classic 5th Gen(i.e. no amp/dac). The music I listen to is about 90% progressive house music from artists such as John Digweed, Sasha, Paul Oakenfold etc. The other 10% of the music I...

I went to the Grado website and they mention brick and morter shops that are considered authorized dealers of Grado merchandise, but I saw no mention of any online places. So, I emailed Grado customer service and got a crazy answer. The rep emailed me to do a Google search and any place selling...

I am very new to the whole high end headphone thing, so please take what I say with a grain of salt. I would love to expand my knowledge of what I like and what I don't but unfortunately almost nobody in the area I live in has headphones over $50. I called numerous audio shops and some were...

Hi everybody! This is my first post on this site. What a great site this is. I didn't even know there was a site like this and so many people into were into headphones. The only headphones I ever knew about were all $20 and less I have been more involved in car audio products than...