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HM-901 - Page 190

post #2836 of 2947
Usb dac, toslink, remote control, some kinda buffer for line out, charging, coaxial, etc...
post #2837 of 2947
213825qiaptmrheot7zm1t.jpg

213828x08u0z0l60db2dul.jpg

We could also consider another alternative if less features were required

http://bbs.erji.com/read.php?tid=1637382

http://bbs.erji.com/read.php?tid=1677099

http://bbs.erji.com/read.php?tid=1677107

http://bbs.hifiman.cn/thread-4168-1-1.html
post #2838 of 2947

Wonder what's inside your HM901? Here's the quite detail analysis on the components that are used (in Chinese):

http://www.hifidiy.net/39-11230-1.html 

 

Sorry if it's already known.

post #2839 of 2947

Ok 901 owners, have I got a faulty unit?

 

Listening to Tori Amos, her voice comes through pure and clear, it really has a lovely sound signature.

 

Unfortunately also coming through loud and clear in the left channel is any form of RF interference.  Loads of pops and buzzes, it's coming from all the mobile phones in the office like there's zero RF shielding at all.

post #2840 of 2947
It shouldnt be like that, should be a lemon
I listen in office all the time, no noise whatsoever
U can check with other earphones and amp card to confirm also
post #2841 of 2947

I've had mine in my shirt pocket right next to my T-Mobile (US) Note 3 with complete silence, on many occasions.  What headphones/iems were you using, and do they remain quiet with other sources?

post #2842 of 2947

Will the wifi functionality of this DAP ever be enabled? Are they waiting to finalize the docking first?

post #2843 of 2947
Quote:
Originally Posted by CosmicHolyGhost View Post

It shouldnt be like that, should be a lemon
I listen in office all the time, no noise whatsoever
U can check with other earphones and amp card to confirm also


Tried 2 pairs of headphones, tried re-seating the amp card and battery.

post #2844 of 2947
Quote:
Originally Posted by system11 View Post
 


Tried 2 pairs of headphones, tried re-seating the amp card and battery.


thats no good... not trying to doubt u or anything... but it seems unusual...

i am sure u have also confirmed the files could be played on other player and the sd card is all good...just trying to troubleshoot this without the need to send it back

post #2845 of 2947

question for you balanced amp owners, where do you get your trrs cables for full size cans? (he500,hd650, etc)

post #2846 of 2947
Quote:
Originally Posted by CosmicHolyGhost View Post
 


thats no good... not trying to doubt u or anything... but it seems unusual...

i am sure u have also confirmed the files could be played on other player and the sd card is all good...just trying to troubleshoot this without the need to send it back


I think it's inevitable at this point.  I should have mentioned it'll do this even without music playing, the amp section is picking up RF.  Actually the popping sounds seem less predictable, while the 'picking up SMS messages' is predictable and reproduceable, I can just send a message from one phone to another and it picks it up loud and clear every time.  I can't believe this isn't a faulty one, this is 'cheap USB powered speakers' level of RF pickup, but dumped into your ear at close proximity.

 

The question is do I try another unit or just refund it and buy something else.

 

Update: turns out since it's a "fulfilled by Amazon" I have to post it back to them, wait for my refund, and then buy another one if I want a replacement.  What a stupid way to do business :/  It's already in the post now back to them, I've got the cash to buy another before the money is refunded.  I'll think on it, I still have a few hours to order a second one for tomorrow morning, but it ties up 2x the money.

 

Compared to the AK240 which is my other main option, the sound definitely has a fuller body to it although the mids and highs aren't as prominent, treble definitely softer than the AK240.   UI seemed 'good enough', I did have to mess around with a combination of gain settings and volume settings depending on the music to get the listening level I wanted.  Volume wheel seemed very stiff and didn't really 'click' into positions though.  Size/looks are nice, I'm easy to please in that respect.


Edited by system11 - 7/4/14 at 8:47am
post #2847 of 2947

I've been getting cables from Ted at headphone lounge and they're great! Really great customer service, easy to talk to and deal with.

 

http://headphonelounge.com

post #2848 of 2947

Replacement arrived today.  Still picks up RF, particularly from Blackberry phones.  No random popping sounds though so that last one did have a problem.

 

With the volume turned down as far as it will go, should the 0 line up with the marker?  Doesn't on this one, can't remember what the first one lined up to.

post #2849 of 2947
Quote:
Originally Posted by system11 View Post
 

Replacement arrived today.  Still picks up RF, particularly from Blackberry phones.  No random popping sounds though so that last one did have a problem.

 

With the volume turned down as far as it will go, should the 0 line up with the marker?  Doesn't on this one, can't remember what the first one lined up to.

I was this > < close to order HM-901, but this worries me a bit. Do they still have QC issues?

 

Edit:

Maybe I should really look at the A&K AK100 II or AK120 II. Was looking at the Calyx M too, but the comments on its sluggish UI really put me down.


Edited by bahamot - 7/5/14 at 9:02am
post #2850 of 2947
Quote:
Originally Posted by bahamot View Post
 

I was this > < close to order HM-901, but this worries me a bit. Do they still have QC issues?

 

Edit:

Maybe I should really look at the A&K AK100 II or AK120 II. Was looking at the Calyx M too, but the comments on its sluggish UI really put me down.


Well I don't know that the dial position is incorrect ;)  I didn't pay enough attention to the first one.

 

It's impossible for the numbers to line up with the marker perfectly because the spacing of them doesn't match the step size of the dial, which is ... not great considering how much this costs.  Mine lines up perfectly at 8, not that I could turn it up that high with the unit on!  I do wish they'd gone with a traditional potentiometer, a resistor array is no more accurate because resistors are rarely spot on to begin with, especially taking into account minor variations from soldering.

 

As for more impressions, the scroll wheel sucks, you can't operate it with one finger unless you want to put enough pressure on it to certainly wear it out over time.  However if you use one finger either side it works fine.  My second one appears to have a slight mark on the pushbutton part in the middle, which isn't perfectly centered.  I get the feeling it is one of those devices where I could return it 3-4 times before finding a perfect one.  There are numerous little tiny things which add up to detracting from a feel of quality, for example there are several air vents along the outside - but the paint on the grilles has been put on thickly and some of the holes are blocked as a result, this was the case on both units.  You could easily pop them with a pin very carefully I expect, but you shouldn't have to.  It doesn't feel 'plasticky' though, nice and robust, size is fine, volume dial on the second one turns and notches freely like it should.  I'll add I'm a perfectionist with a very sharp eye for detail.

 

Sounds lovely though.  Amazing even.  It's nice and warm but everything else is all there, the 'vintage' button which drops treble off a bit is appreciated with some music and makes it easy to listen to.  I suppose if I were to compare it to my X7 I'd say the sound stage is better and the overall 'colour' is similar but it's as if every aspect was polished and improved, it sounds very analogue.  I'm very impressed, it's bringing my music to life.  Compared to the AK240 I tested it's much, much warmer and easier to listen to, although vocals are not quite as forward and the sound not quite as spacious.  I think i could do with some other headphones to test with, my Denon D7100s are very warm too so some tracks which have a lot of bass are a little overpowering while others benefit.  I would kill to have a nice old fasioned bass and treble dial.

 

I'm going to put it carefully back in the box for now and try it at work on Monday to see if the RF pickup is going to be a problem.  This unit doesn't seem to pick it up as badly as the first one, at 2.5 feet away from the phone it's silent, 1.5 it's quiet enough to be ignored, within a foot and it drowns out the music in the left ear (edit: changing the angle of the phone changes which channel it affects!).  I've never seen that before in a proper audio device, it's the one serious flaw I've discovered so far, the rest I could easily ignore.  I've got a couple of Cowon players here, an awful old iRiver, a Minidisc walkman, some USB laptop speakers and one of those tubed Samsung speaker/ipod docks.  Out of all of those only the HM-901 and the cheap laptop speakers pick up the RF, I wonder if they simply didn't put any shielding in.


Edited by system11 - 7/5/14 at 11:34am
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