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FiiO " Flagship " portable amp Mont Blanc/E12 discussing thread, the pre order unit arrives. - Page 131

post #1951 of 2795
Thread Starter 
Quote:
Originally Posted by BenF View Post


I have called from one cellphone to another (both less than 50sm away from E12) - no audible effect.

The EMI issue might have been limited to E12 V1.

 

GSM or CDMA or WCDMA ? The GSM will have bigger EMI issue

post #1952 of 2795
Quote:
Originally Posted by JamesFiiO View Post

 

GSM or CDMA or WCDMA ? The GSM will have bigger EMI issue


GSM

post #1953 of 2795
Quote:
Originally Posted by BenF View Post


GSM

 

Curiosity and kittens here. What are the 3.5mm connectors used? TRS or TRRS?

post #1954 of 2795
Quote:
Originally Posted by Hutnicks View Post

 

Curiosity and kittens here. What are the 3.5mm connectors used? TRS or TRRS?


TRS

post #1955 of 2795
Thread Starter 

E12 can supports any earphones or headphone which used 3.5mm connector. not matter it is TRS or TRRS. 


Edited by JamesFiiO - 5/21/13 at 8:14am
post #1956 of 2795
Quote:
Originally Posted by BenF View Post


I have called from one cellphone to another (both less than 50sm away from E12) - no audible effect.

The EMI issue might have been limited to E12 V1.

 

What about wifi interference? I seem to recall there are some who reported on jitters when there's any type of wifi equipment nearby (smartphones, laptops, tablets, routers, those sorta things).

post #1957 of 2795
Quote:
Originally Posted by JamesFiiO View Post

X3 can support any earphones or headphone which used 3.5mm connector. not matter it is TRS or TRRS. 

 

That may well be true, but are we not talking about E12 here, did I miss something.

 

I am seeing a lot of variance in the TRRS connectors these days which is why I asked the question. I suspect, but have no concrete proof that a fair amount of RF interference is being caused by the connections with TRRS connectors.

post #1958 of 2795
Quote:
Originally Posted by benbenkr View Post

 

What about wifi interference? I seem to recall there are some who reported on jitters when there's any type of wifi equipment nearby (smartphones, laptops, tablets, routers, those sorta things).


I have placed E12 on top of my router - no audible effect.

post #1959 of 2795
I have a TP-Link TD-W8980 (2.4GHz + 5GHz) and I didn't notice any audible noise with the E12 placed right on the unit.

Also no noise with older routers (Netgear DGN2000 and D-Link DSL G624T).
Edited by MrScratch - 5/21/13 at 1:44pm
post #1960 of 2795

I'm getting terrible noise through my DT770 Pros connected to my HTC One with the amp placed right on top of the phone, which it has to be using the short cable supplied (the F8 cable).

 

Originally I thought my longer 3.5mm to 3.5mm right angle cable might be to blame, it's longer so i can freely rotate the phone to watch videos etc, but after less than a day's use I can see it's still the case.

 

I'm getting like the "GSM noise" you get when putting a 2G phone near amps/speakers that aren't shielded.

 

So i'm hoping a cable like this can help:

http://www.ebay.com.au/itm/2m-HQ-OFC-Shielded-3-5mm-Stereo-Jack-to-Jack-Cable-Gold-/200827575095?pt=AU_Television_Accessories&hash=item2ec2419b37

 

I don't get this noise when the DT770s are plugged into the phone "naked" and it used to be very rare with my E11.

 

If the new OFC cable doesn't work, the only solution appears to be a 3 to 5 metre cable, and keep the two devices in seperate pockets.

 

I'm not sure i'm desperate enough to pay the price this ebay seller wants however, LOL:

http://www.ebay.com.au/itm/3m-3-5mm-Dual-Right-Angle-Male-Jack-to-Jack-Stereo-Audio-Cable-006049-/190729178914?pt=UK_Computing_Sound_Vision_Audio_Cables_Adapters&hash=item2c68584f22

 

*ahem* or this one:

http://www.ebay.com.au/itm/2m-3-5mm-Dual-Right-Angle-Male-Jack-to-Jack-Stereo-Audio-Cable-006048-/380474428220?pt=UK_Computing_Sound_Vision_Audio_Cables_Adapters&hash=item58960b0b3c


Edited by jjcoolaus - 5/21/13 at 9:47pm
post #1961 of 2795
Quote:
Originally Posted by BenF View Post


I have called from one cellphone to another (both less than 50sm away from E12) - no audible effect.

The EMI issue might have been limited to E12 V1.

 

I have E12 v2 and the amp has to be on top of the smartphone to get this effect. By moving it 3-4 cm away you can overcome the issue but that's impossible if all the gear is in one pocket.

 

The answer is to have the amp in a seperate pocket - the more i read about this problem the more I think that's the solution.

 

I've just ordered a 3 metre 3.5mm cable with one end having a right angle plug (to go into my phone) so that should fix the problem. I'm hoping to have it by Friday and will report back here when i do.

(seperate to the OFC links i posted above, and it only cost me $5 Australian - i'm still keen to get the OFC cable though as it's thicker and will be of nicer quailty)


Edited by jjcoolaus - 5/21/13 at 10:08pm
post #1962 of 2795

I think I have found the EMI issue. When the phone is using mobile Internet (over GSM) - the noise is very loud.

No problem with GSM calls or WiFi Internet.

post #1963 of 2795

Alright, thanks for the responses guys.

I'll be getting an E12 this Sunday/Monday, I'll report back on any interference issues.

post #1964 of 2795
Quote:
Originally Posted by BenF View Post

I think I have found the EMI issue. When the phone is using mobile Internet (over GSM) - the noise is very loud.

No problem with GSM calls or WiFi Internet.

 

Here in Australia i'm still getting some noise when I use a mobile wifi hotspot, unless my hotspot is in a different pocket, so i'm having some success there - so I might have my pocket wifi in right jacket pocket, the amp in my left jacket pocket and my phone in my right pants pocket or inside jacket pocket (which is higher up than the right jacket pocket).

 

In summer I might have a bit of a problem lol.

 

I use a seperate mobile wifi hotspot for streaming music often due to the cost of data on my main provider being so high. The 2nd provider is cheap but unreliable, and useless for voice calls, so i do need both.

 

So it might depend on what frequencies your mobile internet is using. On 900 (2G/3G) and 850mhtz (3G) the noise is quite loud, i can really hear it inside buildings and lifts. At 2100mhtz (3G) and 1800mhtz (4G) the noise is reduced, but still there. Again keeping any RF emitting devices away from the amp (by 5cm - that's 2 inches for you Americans) seems to be a solution.

 

I'll report back on what difference a shielded cable between the amp and the phone makes when it comes, but i think the noise could be generated by the amp itself, not it's cabling.

 

*edit* The reason why a lot of people have success with using wifi instead is because the wifi transmitter is much further away from the amp than your phone is. When I walk into my house still wearing my headphones these interference issues go away as I jump on the home wifi.


Edited by jjcoolaus - 5/24/13 at 1:37am
post #1965 of 2795

I am noticing a static kind of noise when I turn the knob on my E12. Any suggestions?

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