[miketlse]

My HA-2 worked ok at first, then there was an update to android, and the Interference started. I added a RF choke to the cable, but that did not cure it. using the same phone, but a chord mojo instead, still produces some Interference.

I suspect that the root cause is that some 'bug fix' in the android update, has created this new bug.
You are using apple instead, but try and remember if you have upgraded your version of the operating system. Also try switching your phone off, so as to empty the cache completely, then reboot the phone. Maybe this will achieve nothing, but it is a cheap and low hassle thing to try, just in case it saves you needing to return your HA-2.

 

[TimeLord]

Just looked backward on the thread and see that the issue of RFI has already been posed but no cure suggested. Looks like it may be going back. Shame...

I don't experience this issue since my HA-2 stack with an iPhone 6 is only using local files and the phone is in airplane mode.
With most portable amp/dacs you're going to experience interference simply because of the compromises to make a true portable device.

I know someone mentioned the Hifi M8, but that's kind of big to be a true portable.

A cheap fix could be to just place sheet metal between your phone and the HA-2. That should stop the most direct path of interference. Sheet metal is cheap and easy to work with. Cut it to size and use double sided tape to secure it in place.

Let us know if you try it.

 

[miketlse]

I remember someone posted about making such a shield, using the thin malleable ferrite sheet typically used to form transformer cores. I am not sure if it was on the HA-2 or the Mojo thread. 

 

[Jimmy101]

Thanks for the reply. I'm ok with a little interference but to the point of cutting off the connection entirely was a new experience.
Today no problem. Go figure. Maybe it was a crazy day for RFI so if anybody cares to chime in towards mt education feel free

 

[miketlse]

This was the post that I was thinking about. It does relate to a mojo, but the photos help you visualise what he did, if you want to try it with your HA-2
 
http://www.head-fi.org/t/784602/chord-mojo-the-official-thread-please-read-the-3rd-post/17805#post_12592003

 

[TimeLord]

This was the post that I was thinking about. It does relate to a mojo, but the photos help you visualise what he did, if you want to try it with your HA-2

http://www.head-fi.org/t/784602/chord-mojo-the-official-thread-please-read-the-3rd-post/17805#post_12592003

That's about what I had in mind. Theoretically, it should be effective.

 

[Jimmy101]

Thanks. I'll look into it

 

[miketlse]

I was getting crackling every few seconds, when using either mojo or the HA-2, to listen to music from my phone. This happened with both Foobar2000 and Hiby as the music players.
 
Last night i installed UAPP as the music player, and this morning the music was free of interference - true there was one small 'pop' during twenty minutes of music, but i am not sure if that was interference. At first i thought it sounded almost like a pop you could get when listening to a record.
 
This does make me think the earlier crackling was due to the android music players.  

 

[spw1880]

Hi to all ha2 users
I am a new oppo ha2 user and enjoying pairing it with my jvc fx1200.
Just want to ask if anybody charge the ha2 with other lower amp charger other than the vooc charger supplied. Is there any negative effects from using a regular 5v2amp charger on the ha2?

Any info would be appreciated.. thank you

 

[miketlse]

Hi to all ha2 users
I am a new oppo ha2 user and enjoying pairing it with my jvc fx1200.
Just want to ask if anybody charge the ha2 with other lower amp charger other than the vooc charger supplied. Is there any negative effects from using a regular 5v2amp charger on the ha2?

Any info would be appreciated.. thank you

 
i think that the only negative effect is that it will take longer.

 

[RCBinTN]

  I was getting crackling every few seconds, when using either mojo or the HA-2, to listen to music from my phone. This happened with both Foobar2000 and Hiby as the music players.
 
Last night i installed UAPP as the music player, and this morning the music was free of interference - true there was one small 'pop' during twenty minutes of music, but i am not sure if that was interference. At first i thought it sounded almost like a pop you could get when listening to a record.
 
This does make me think the earlier crackling was due to the android music players.  

FWIW, I get no crackles or pops at all from my portable rig:  AK120ii - HA-2 - SE846.  The HA-2 is in "C" mode so the input is an analog signal from the AK120ii which serves as the DAC (it is an excellent DAC).  The connector cable between the two is a Silver Dragon from Moon Audio.  I find the HA-2 to be super quiet as an amp for the SE846, which IMO says a lot as the ear buds are super-sensitive.
 
Enjoy your music!
RCB

 

[spw1880]

Hi to all ha2 users
I am a new oppo ha2 user and enjoying pairing it with my jvc fx1200.
Just want to ask if anybody charge the ha2 with other lower amp charger other than the vooc charger supplied. Is there any negative effects from using a regular 5v2amp charger on the ha2?

Any info would be appreciated.. thank you

 

[howdy]

Hi to all ha2 users
I am a new oppo ha2 user and enjoying pairing it with my jvc fx1200.
Just want to ask if anybody charge the ha2 with other lower amp charger other than the vooc charger supplied. Is there any negative effects from using a regular 5v2amp charger on the ha2?

Any info would be appreciated.. thank you

You can charge with other chargers but they will be considerably slower then the supplied VOOC charger.

 

[TimeLord]

Hi to all ha2 users
I am a new oppo ha2 user and enjoying pairing it with my jvc fx1200.
Just want to ask if anybody charge the ha2 with other lower amp charger other than the vooc charger supplied. Is there any negative effects from using a regular 5v2amp charger on the ha2?

Any info would be appreciated.. thank you

I usually charge it using a 5v 2A USB charger. I haven't had any issues, but it does take longer to charge.

 

[spw1880]

Thanks so much for the info...
Im relieved then...that it doesnt have to be 5amps..
Great performing dac amp...
Cheers