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Centrance Hifi-M8 and Hifi-M8 LX (8 versions!) impressions thread - Page 16

post #226 of 1319
Thanks for being so on point about this Michael!

For anyone curious, these were the conditions my phone was running on:

Phone: iPhone 4S
Carrier: SingTel
3G: On
Cellular Data: On
Data Roaming: Off
Signal Strength: 4/5 bars
WiFi: Off
Location services: Off
Bluetooth: Off

I have a Verizon iPhone 4 that I can test out once I get my unit. I'm thinking it might be the frequencies used by SingTel, I'll try to find them and post them here/email Michael with them.
post #227 of 1319
Quote:
Originally Posted by mgoodman View Post

Yes, thanks. We are investigating on our side as well. This is high priority, so we are ganging up on the issue. Sounds like some people have interference and others have no problems at all. This gives us some food for thought.

I have had one brief period where there seemed to be something odd going on. It didn't sound like typical interference, the sound was too degraded.  I  Powered cycled the the HiFi-M8 and it was fine.  Was unable to reproduce since then.

 

I have been using the HiFi-M8 mostly being fed by my Mac Air.  Given the reports I thought it would be useful to spend a bit more time listening to my iPhone  5.  I haven't heard any interference.  I have noticed something odd though.  Some tracks I listened to sounded pretty much the same, but not all?  In particular, Bird on the Wire by Jennifer Warners from the Famous Blue Raincoat which was ripped in Apple Loseless.  Playing from the Air it sounds as I would expect.  From the iPhone is sounds a bit distant, as if I was listening through a low-fi blue-tooth connection. Any idea?

 

--mark

post #228 of 1319
Well after trying to isolate the issue, it seems to be only with a third party music player. I use ipeng to stream flac directly from my nas. I use it both at home and away as well. It saves me from have to load lossless files onto my iphone. On the stock player, the interference hasn't been there. I also use ipeng on my ipad and the interference isn't there with it. The interference also goes away if I put it in airplane mode.
post #229 of 1319
Quote:
Originally Posted by verber View Post

I have had one brief period where there seemed to be something odd going on. It didn't sound like typical interference, the sound was too degraded.  I  Powered cycled the the HiFi-M8 and it was fine.  Was unable to reproduce since then.

 

I have been using the HiFi-M8 mostly being fed by my Mac Air.  Given the reports I thought it would be useful to spend a bit more time listening to my iPhone  5.  I haven't heard any interference.  I have noticed something odd though.  Some tracks I listened to sounded pretty much the same, but not all?  In particular, Bird on the Wire by Jennifer Warners from the Famous Blue Raincoat which was ripped in Apple Loseless.  Playing from the Air it sounds as I would expect.  From the iPhone is sounds a bit distant, as if I was listening through a low-fi blue-tooth connection. Any idea?

 

--mark

I can only think that it's due to the quality of the ripping....Try some other files... M8 doesn't care whether the audio comes from the USB B hole (Laptop) or iPhone hole (USB A), so I would want to suspect the file itself... try others.

post #230 of 1319
Quote:
Originally Posted by moodyrn View Post

Well after trying to isolate the issue, it seems to be only with a third party music player. I use ipeng to stream flac directly from my nas. I use it both at home and away as well. It saves me from have to load lossless files onto my iphone. On the stock player, the interference hasn't been there. I also use ipeng on my ipad and the interference isn't there with it. The interference also goes away if I put it in airplane mode.

I'm sorry, Could you be a little more specific -- when does the interference show up? And what does it sound like? What's the name of the stock player?

post #231 of 1319
I tested the M8 with iPhone 5 on Verizon LTE network and did not experience any interference.
post #232 of 1319
Quote:
Originally Posted by mgoodman View Post

I'm sorry, Could you be a little more specific -- when does the interference show up? And what does it sound like? What's the name of the stock player?

Stock player is apple, the interference shows up when I open my third party player. It's not there with apple's stock player. Since its not with the stock player, Im not concerned with it anymore.
post #233 of 1319
Quote:
Originally Posted by moodyrn View Post


Stock player is apple, the interference shows up when I open my third party player. It's not there with apple's stock player. Since its not with the stock player, Im not concerned with it anymore.

Thanks for that. For curiosity's sake, could you describe your setup? How is the logitech squeezebox connected, how are you using iping? I'm trying to understand the RF path in your setup.

post #234 of 1319
Oh, that's without the sb in the chain. Ipeng allows you to stream directly to an iPhone/ipad from logitech music server running on an nas. So it essentially turns your idevice into a squeezebox. I'm able to stream flac straight to my idevice. It also works on lte or 4g. Although 4g sometimes studders, but lte is flawless.
post #235 of 1319
Quote:
Originally Posted by mgoodman View Post

I can only think that it's due to the quality of the ripping....Try some other files... M8 doesn't care whether the audio comes from the USB B hole (Laptop) or iPhone hole (USB A), so I would want to suspect the file itself... try others.

 

I can understand that there might be an issue with the ripping of that particular track and am trying to figure out if there are issues with other tracks, and if so, what they have in common.

 

What I don't get is why it would sound different from my Mac and from the iPhone.  I would have thought it would have sounded poor from both sources since they are playing the same fine. Aren't both just sending a digital bitstream which should be identical since they are playing the same track.  For the record, I am keeping it simple, using iTunes (without any special drivers / pluggins right now) and the stock iTunes player on the current release of IOS.  The track was ripped using iTunes 9.1 as apple loseless with error correction / detection on.

 

--mark

post #236 of 1319
Hello Michael, I saw this statement posted on your blog "Later today we learned that the second customer only experienced interference when running some other equipment, so the findings there are inconclusive." I'm not running other equipment. I did my best to explain my situation. I'm not running a squeezebox touch, I was clear about that, I'm using a third party app called ipeng. But it is a third party app which is why it's not a big deal for me. But I'm not getting the interference running other equipment.
post #237 of 1319

So I did some digging around and find that unlike the United States, which uses different frequencies for it's data uplink and downlink, SingTel (the provider in Singapore) uses only one frequency for both - 2100MHz. I don't really feel that this is what caused the sound that I heard.

 

What I did in detail, if this helps Michael:

1) I plugged my iPhone 4S into the M8 and put my 334s in my ears

2) I heard a weird mixture of buzzing and sharp pinging noises, which sounded like interference to me

3) I turn my iPhone 4S into airplane mode and the noises slowly fade away

 

Maybe the unit that I tried was defective somehow? Or it could be my phone. 

post #238 of 1319

Well some new developments. The interference isn't limited to running the ipeng app. I just had a listening session with the accudio app that's discussed in another forum here, and from time to time, I was getting the same interference. Also when I first turned it on with no apps running, I also got the same interference. I still haven't gotten it using the stock iphone music player. But it's no longer limited to just one app.

 

Also, I would like to ask, is it normal to have sync issues. Sometimes on both my ipad and iphone, I don't get any sound. I either have to unplug and replug the usb cable or turn the device off and back on again. I don't know if this is considered normal or not. But sonically, I stand by everything I've said previously. The sound is better than every midfi desktop rig I've owned or listened to. And it's closer to high end than it is to midfi. So in that regard, this thing is a homerun. The issues I'm experiencing are minor, but are still there.

post #239 of 1319

I would also like to add, I wonder if the type of headphones used plays a role if you hear the interference or not. I was using my jh13s. This may be a non issue with less sensitive cans. So Michael have you done your tests using very sensitive iems?

post #240 of 1319

I recently received the HiFi M8 and have had limited time for an evaluation.  However, with my UERMs (Win 7 64-bit, JRiver 17, iFi USB power, Pangea USB cabling) and the HiFi M8 at the lowest settings (except bass at the middle setting), I am getting very clean, clear music that is balanced across the entire frequency range.  Soundstage is reasonably broad.  It is dead quiet (no noise) through the very sensitive UERMs.  The HiFi M8 is also excellent into a better soundbar (Bose CineMate 1 SR), at least once you remember to boost the gain setting.  As both a headamp/dac and dac/preamp into power speakers, it exceeds the abilities of a HRT Headstreamer (as it should for 3X the price).  Although probably unrelated to the reported phone interference(?) issues, sound quality can be improved by reducing the latency of the ASIO driver provided by Centrance (from the default 20 ms down to ~5 ms).

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