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AKG K701 Power issue

post #1 of 6
Thread Starter 

I need some extra power for connecting my AKG K701 headphones to the Astro Mixamp. It powers up fine, however when connecting a microphone to the mixamp as well as the K701's it produces a loud humming noise which I believe is from the lack of power.

 

I don't have an amp right now, but what I do have is a Fatality Recon3d sound-card in my PC. This may be a stupid question but can I connect my headphones to the sound-card and then to the xbox and mixamp?

 

I have attached a mini diagram of the inputs on the sound-card, any help would be greatly appreciated .

 

 

post #2 of 6
Quote:
Originally Posted by psx2 View Post

I need some extra power for connecting my AKG K701 headphones to the Astro Mixamp. It powers up fine, however when connecting a microphone to the mixamp as well as the K701's it produces a loud humming noise which I believe is from the lack of power.

I don't have an amp right now, but what I do have is a Fatality Recon3d sound-card in my PC. This may be a stupid question but can I connect my headphones to the sound-card and then to the xbox and mixamp?

I have attached a mini diagram of the inputs on the sound-card, any help would be greatly appreciated .




No - this isn't correct. "lack of power" does not cause headphones to hum. Something else is going on. Sounds like feedback or possible a ground-loop. What kind of microphone are you connecting?
post #3 of 6
Thread Starter 
Quote:
Originally Posted by billybob_jcv View Post


No - this isn't correct. "lack of power" does not cause headphones to hum. Something else is going on. Sounds like feedback or possible a ground-loop. What kind of microphone are you connecting?

 

Sorry I was just assuming it was a power issue from this quote (Mad Lust Envy headphone guide)

 

Quote:
Trust me, the Mixamp is enough for the K701 if again, you don't add voice chat. If you do, you WILL need to attach an amp to the Mixamp's headphone out, just to juice the K70x and voice chat audio. Yes, they do scale with good amping, but for the purpose of gaming, I don't deem it necessary, asides from when you're in need of voice chat.

 

I have tried multiple microphones, as soon as i unplug all of them the humming sound goes

post #4 of 6
I don't know enough about the Mixamp to understand why doing voicechat would require a headphone amp. That just doesn't make any sense to me - one is an input voltage and the other is an output voltage - unless it is overtaxing the power supply? I don't know, someone would have to explain what the heck they are talking about. A bitstream is a digital representation of an analog signal and no matter how complex that analog signal is (music, 10 peoples voices, whatever) - it is still whatever bits per second and bit depth it is encoded to be and it has whatever dynamic range in that encoding. Once the digital signal is converted to analog, then the amp tries to send that signal into the load created by the headphones - and the microphone is NOT on that same circuit. The mic has it's own circuit on the input side. They could all be fed from the same power supply, but I can't imagine they would design the unit to provide less power to the headphones when a mic is used - that's just silly. Still, we are talking about gaming gear...

But set ALL of that aside - lack of sufficient voltage for the headphones should STILL not make them hum. They just get quiet. Feedback or a ground loop is a whole different thing. Do you have the ability to turn down the volume on the mic without changing the volume on the headphones? If you can do that, do the headphones still hum?
post #5 of 6
Thread Starter 
Quote:
Originally Posted by billybob_jcv View Post

I don't know enough about the Mixamp to understand why doing voicechat would require a headphone amp. That just doesn't make any sense to me - one is an input voltage and the other is an output voltage - unless it is overtaxing the power supply? I don't know, someone would have to explain what the heck they are talking about. A bitstream is a digital representation of an analog signal and no matter how complex that analog signal is (music, 10 peoples voices, whatever) - it is still whatever bits per second and bit depth it is encoded to be and it has whatever dynamic range in that encoding. Once the digital signal is converted to analog, then the amp tries to send that signal into the load created by the headphones - and the microphone is NOT on that same circuit. The mic has it's own circuit on the input side. They could all be fed from the same power supply, but I can't imagine they would design the unit to provide less power to the headphones when a mic is used - that's just silly. Still, we are talking about gaming gear...

But set ALL of that aside - lack of sufficient voltage for the headphones should STILL not make them hum. They just get quiet. Feedback or a ground loop is a whole different thing. Do you have the ability to turn down the volume on the mic without changing the volume on the headphones? If you can do that, do the headphones still hum?

Hi,

 

The mixamp does have dial where I can completely turn down the microphone volume, however this changes the headphone volume too. When this is done the hum completely goes away. Also I forgot to mention the K701 and the microphone both go into one input via this splitter - http://www.astrogaming.co.uk/pc-headset-y-adapter/3ACBL-HBM9U-760.html This has to be done to control the voice volume.

post #6 of 6
The splitter puts the mic and headphones on the same plug, but not the same circuit. The plug is carrying the ground, left out, right out and the mic input. I thought the knob on the mixamp was to balance between "voice" and "game" sounds? I'm wondering if it could be a bad cable between the mixamp and the xbox controller? Have you tried it with a different controller?
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