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HM-901 - Page 168

post #2506 of 3004
Quote:
Originally Posted by myared View Post
 


What's the "new classic card"?

 

Classic card is going to be the latest stock card for HM901. Basically it is the original stock card (or the 2nd stock, before they switch to power card) found on HM801, they tweak it a bit for the HM901.

post #2507 of 3004
What's the output impedance of that amp card (for HM-901)?
post #2508 of 3004
Quote:
Originally Posted by LarsHP View Post

What's the output impedance of that amp card (for HM-901)?

 

For the stock AD8397 card, less than 1 ohm. Same for the Classic card and the balanced card. You don't need to worry about output impedance on the HM901 as Hifiman is keeping the output impedance very low this time.

post #2509 of 3004
Nice. I just asked because you said the discrete amp / Classic amp card was basically the Standard amp from the HM-801 which had 18 Ohms output impedance.
post #2510 of 3004
Quote:
Originally Posted by LarsHP View Post

Nice. I just asked because you said the discrete amp / Classic amp card was basically the Standard amp from the HM-801 which had 18 Ohms output impedance.

 

Yes, the Classic card (which isn't fully discrete btw, but opamp + transistors buffer) is similar in topology to the old stock card on HM801. They just did it the way I have mod'ed my HM801 stock card by removing the 18 ohm resistors on the output.

post #2511 of 3004
Quote:
Originally Posted by Mimouille View Post


Maybe mine since I ordered the Sony....but I doubt it smily_headphones1.gif

Excuse me,but which is this Sony?

post #2512 of 3004
Quote:
Originally Posted by Theodore View Post
 

Excuse me,but which is this Sony?


Sony NW ZX1

post #2513 of 3004

Thank you very much.

post #2514 of 3004
post #2515 of 3004
Quote:
Originally Posted by Mimouille View Post
 


Sony NW ZX1

 

That interests me. When do you get it?

post #2516 of 3004
Quote:
Originally Posted by VisceriousZERO View Post
 

 

That interests me. When do you get it?


Well as soon as Price Japan sends it...so early December...but if I receive it after the 12th I will be in France for a month so you will have impressions from others first...

post #2517 of 3004
Quote:
Originally Posted by Mimouille View Post
 


Well as soon as Price Japan sends it...so early December...but if I receive it after the 12th I will be in France for a month so you will have impressions from others first...

That sounds good, I'll see what I can do as well...

post #2518 of 3004

Hello, Considering buying HM-901 but a bit confused about amp cards. Any help would be greatly appreciated. I primarily use Heir Audio 5.0 iems and Shure 535s. I'm basically looking for a recommendation on which amp card I should use. I have read there are volume issues with using the balanced card with iems. High impedance vs low impedance and how it relates to my iems is also confusing to me. Im just not sure what would be my best options for the HM-901. I'm currently using a Cowan J3 + Heir Audio Rendition amp. Looking for a more compact solution to great sound. Thank You so much for any advice you can give.

post #2519 of 3004

If you are limited to mostly IEM, there is an IEM card though.

post #2520 of 3004
Quote:
Originally Posted by chardy52 View Post
 

Hello, Considering buying HM-901 but a bit confused about amp cards. Any help would be greatly appreciated. I primarily use Heir Audio 5.0 iems and Shure 535s. I'm basically looking for a recommendation on which amp card I should use. I have read there are volume issues with using the balanced card with iems. High impedance vs low impedance and how it relates to my iems is also confusing to me. Im just not sure what would be my best options for the HM-901. I'm currently using a Cowan J3 + Heir Audio Rendition amp. Looking for a more compact solution to great sound. Thank You so much for any advice you can give.


The output impedance is less than 1Ohm from both the Balanced and IEM amp cards (and maybe all the other HM-901 cards too). This means your headphones will sound as intended (no change in frequency response).

 

If you only plan using HM-901 with IEMs and don't want to get balanced cables for these, I would suggest getting the IEM amp card. If the Classic (the "new standard") amp card is available now - then this could also be one to consider. However, practically noone here has heard it (except user jamato8):

http://www.head-fi.org/t/656138/hifiman-hm-901-a-review-in-progress-factory-visit-pg-18-imgs-pg-19-fw-dsd-1-082/1575#post_9984465

http://www.head-fi.org/t/656138/hifiman-hm-901-a-review-in-progress-factory-visit-pg-18-imgs-pg-19-fw-dsd-1-082/1575#post_9986361

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