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HM-901 - Page 164

post #2446 of 3167
Quote:
Originally Posted by kkcc View Post

"Hardware mode bypassing the digital volume control" is just a nice marketing cover for the fact RWA do not have access to the firmware and modify it to control volume via the wm8741 and the stock firmware is for the wm8740. Vinnie had even openly invite firmware modders like listrds to see if they can get the firmware to work with the 8741 for volume control.
Maybe they don't have access to the firmware to the new chip but the fact is the same: digital volumen deteriorate SQ without extra processing. This is an example tha I found in the review of Stereophile of the Wadia 121:

According to Wadia, the 121 has no volume-control bypass and no need for one. Digital inputs are upsampled to 32-bit/1.4MHz, then processed with Wadia's proprietary DigiMaster interpolation filtering algorithm, which, they claim, maintains resolution at all volume settings. Sure enough, I could hear no difference between using the 121 as a preamp or through another preamp, at any volume level. In the latter case, I'd just max out the volume and go. Source; http://www.stereophile.com/content/wadia-121decoding-computer-da-processor

So the upsampling is an internal process to provide accuracy to the digital volume.

Digital volumen control is a nice feature but I know that it would be very expensive for a portable high end player without compromises.
Edited by fermelom - 10/26/13 at 2:10pm
post #2447 of 3167

I have a question, I have balanced card and am using IEM with TRRS but there is no difference between normal and Balance position on the HM-901, is this normal or is my card defective?

post #2448 of 3167
Quote:
Originally Posted by OddJobs View Post
 

I have a question, I have balanced card and am using IEM with TRRS but there is no difference between normal and Balance position on the HM-901, is this normal or is my card defective?

I'm pretty sure it's not recommended to switch from bal to SE with the unit on.

post #2449 of 3167
Quote:
Originally Posted by OddJobs View Post

I have a question, I have balanced card and am using IEM with TRRS but there is no difference between normal and Balance position on the HM-901, is this normal or is my card defective?
There is a problem. Switching to balanced mode makes the sound immediately louder for one. Check if the card is properly inserted. Take it out and back in.
post #2450 of 3167
Quote:
Originally Posted by Mimouille View Post


There is a problem. Switching to balanced mode makes the sound immediately louder for one. Check if the card is properly inserted. Take it out and back in.

 

Agreed.

 

Its kind of sad how many 901s are failing while many others have perfectly working units... hope Hifiman can fix this soon!

 

On another note, I got tired of lurking. XD

post #2451 of 3167

I thought balanced signals were louder anyway ? a higher voltage or something

post #2452 of 3167
Quote:
Originally Posted by OddJobs View Post
 

I have a question, I have balanced card and am using IEM with TRRS but there is no difference between normal and Balance position on the HM-901, is this normal or is my card defective?

I had the same issue with mine when I first got the balance card.  I had to remove, and reinsert it and press it into the slot really well.  Once I did that it has been working fine and the switch is noticeable.  On regular trs cans simply flick and then down for trrs balanced.  The audio quality is so different you will know 100% when it is working.

post #2453 of 3167
Quote:
Originally Posted by KT66 View Post
 

I thought balanced signals were louder anyway ? a higher voltage or something

 

Balanced does sound "louder". However when volume matched, the balanced setting should (at least in my case) sound "wider" - this is even with dynamic/Hybrid IEMs and more so with dynamic driven headphones. So far though with balanced armatures, I hear very little benefit from balancing - could be just me though.

post #2454 of 3167
Quote:
Originally Posted by kkcc View Post


Imho any iem or hp that either 1) require more power or 2) has a less forward mids would benefit greatly with this discrete amp board. It works great with the 1p2, I like it better than the balanced amp in balanced mode.

For IEMs that benefits from a wider soundstage, I still like the balanced mode more.

After a whole week of listening, I feel that the highs on the discrete amp board is kinda out of control, don't know if it's my card only, will give more listening to it. I actually went out and bought a balanced card, and currently comparing the two. I don't think I really like the discrete board right now, maybe I'll have a different opinion later. My ears are kinda tired now, with all the switching around and listening to some other new gears. 

post #2455 of 3167

@bowtung, I am eyeing @ your discrete card.... :evil:

post #2456 of 3167
post #2457 of 3167
Any brief explanation in English?
post #2458 of 3167
Quote:
Originally Posted by fermelom View Post


Any brief explanation in English?

A 801 sound like card. Minibox and balanced cards are strict Hifi while this one is more lush and romantic like 801 as described.

 

The price is quite good. 

post #2459 of 3167

"HIFIMAN releases a new "classic" card for 901. Why is this a classic? Because it is an improved version based on the 801 card circuit.building on top of  801 design, this new "classic" card has reduced the output impedance significantly.... it will result in higher output, revealing detail,and better synergy with balanced armature c/iem."

 

Opamp : OP275... and all other stuff are really technical to translate... I am the worst translator ever....

post #2460 of 3167
Quote:
Originally Posted by CosmicHolyGhost View Post
 

"HIFIMAN releases a new "classic" card for 901. Why is this a classic? Because it is an improved version based on the 801 card circuit.building on top of  801 design, this new "classic" card has reduced the output impedance significantly.... it will result in higher output, revealing detail,and better synergy with balanced armature c/iem."

 

Opamp : OP275... and all other stuff are really technical to translate... I am the worst translator ever....

That's great already ;)

 

It will be the stock 901 amp card from now on also.

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