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post #8401 of 14534
Google TA2020 common ground. Results say it's NOT shared.
post #8402 of 14534

So I got good news and bad news, but mostly good news. :)

 

I found the source of the hum of the Baby Sophia amp and it's actually caused by having my WA7 plugged in at the same time. The bad news is that I tried everything from using separate power conditioners to using different outlets, but it looks like the WA7 really needs to be unplugged to get rid of the hum. Guess all the outlets in my room are connected. It's not like I need both plugged in at the same time anyways. It's good that the WA7 DAC doesn't require it to be plugged in to function.

 

I also went ahead and ordered the Lepai since I have the HE Adapter and XLR connector already and it's only $20. Will see how it compares to the Baby Sophia.

 

Edit: Found the technical term. Ground loop hum.

http://www.audioholics.com/home-theater-connection/ground-loops-eliminating-system-hum-and-buzz


Edited by Sonido - 10/8/13 at 5:26pm
post #8403 of 14534
Quote:
Originally Posted by manbear View Post
 

How do you guys connect the Lepai to headphones? $20 is great, but all the Hifiman adaptors I've seen are considerably more expensive. Kind of defeats the point. Any recommendations for a cheap adapter cable? Could be something with a 1/4" to speaker adapter, or a cable that connects to the mini coaxials on the headphones, whatever's cheapest. I realize DIY would probably be cheapest, but I suck at that. 

 

You'll have to buy it custom or have someone make it for you. I bought mine for ~$40 from a head-fi member who was getting rid of his. Well worth it.

 

I don't believe in $100+ "magical" cables made with unobtanium.

post #8404 of 14534

Would these headphones be a great upgrade to the K702 65? Looking for another headphone and love the signature of my Annies and it sounds to me (having read reviews but starving for a test) that the HE-500's are similar in signature but improved in many ways. 


I want to know if they are an upgrade or a companion. 

post #8405 of 14534
Quote:
Originally Posted by bhazard View Post
 

 

You'll have to buy it custom or have someone make it for you. I bought mine for ~$40 from a head-fi member who was getting rid of his. Well worth it.

 

I don't believe in $100+ "magical" cables made with unobtanium.

Shhhhh, count me in as +1.  :D

post #8406 of 14534
Quote:
Originally Posted by bhazard View Post
 

 

You'll have to buy it custom or have someone make it for you. I bought mine for ~$40 from a head-fi member who was getting rid of his. Well worth it.

 

I don't believe in $100+ "magical" cables made with unobtanium.

 

Any suggestions on people to contact to have a custom one made at a reasonable price? Thanks. 

post #8407 of 14534

http://www.amazon.com/HOSA-Stereo-4-Inch-Phone-Female/dp/B000068O5D

 

+

 

2 x http://www.amazon.com/Pyle-Pro-PCBL34-Gauge-Female-Banana/dp/B004HJ5JPQ

 

=

 

MATHEMATICAL! (~$20)

 

(Careful with shared ground/resistance matching.)


Edited by Sonido - 10/8/13 at 7:09pm
post #8408 of 14534
Quote:
Originally Posted by Sonido View Post
 

http://www.amazon.com/HOSA-Stereo-4-Inch-Phone-Female/dp/B000068O5D

 

+

 

2 x http://www.amazon.com/Pyle-Pro-PCBL34-Gauge-Female-Banana/dp/B004HJ5JPQ

 

=

 

MATHEMATICAL! (~$20)

 

(Careful with shared ground/resistance matching.)

 

Thanks! Can you elaborate on the issues with shared ground and resistance matching? 

post #8409 of 14534
Quote:
Originally Posted by manbear View Post
 

 

Thanks! Can you elaborate on the issues with shared ground and resistance matching? 

What amp are you looking at?

post #8410 of 14534
Quote:
Originally Posted by Sonido View Post
 

What amp are you looking at?

 

The $20 Lepai. It doesn't look like it takes banana plugs, so could I just chop the mono ends off that 1/4 inch adapter, figure out which wire is + and which is -, and stick the bare wire right into the spring loaded holes in the back of the amp? I don't really see where the ground comes into play.... I haven't studied electronics since high school physics.

post #8411 of 14534
Quote:
Originally Posted by manbear View Post
 

 

The $20 Lepai. It doesn't look like it takes banana plugs, so could I just chop the mono ends off that 1/4 inch adapter, figure out which wire is + and which is -, and stick the bare wire right into the spring loaded holes in the back of the amp? I don't really see where the ground comes into play.... I haven't studied electronics since high school physics.

I looked up info earlier on shared ground on that amp and it's apparently not shared, which means doing that setup would likely damage the amp/make it unusable. You would need to rewire your HE-500 to output 4 pin XLR and then connect to opposite sex XLR and chop off the end then manually connect to wire grips. I think the cheapest  HE-500 to XLR is $150 from Hifiman. Of course you can just snip off the TRS in your default cable and connect directly to the amp, but you lose the the ability to connect to TRS inputs. You'd be kinda going all in here and I don't know if you want to do that. Since the Lepai is a solid state amp resistance matching shouldn't be an issue here (in the positive direction as in higher resistance of headphones), so no need for resistors.

 

Also if you decide to chop off the stock cable, figuring out polarity/left-right should be quite the treat. :blink: 


Edited by Sonido - 10/8/13 at 7:52pm
post #8412 of 14534

You could also get this for $60 and chop off the TRS and try to figure out the correct wiring. HE-400 and HE-500 has the same connector afaik.

 

http://www.head-direct.com/Products/?act=detail&id=145

post #8413 of 14534
All this talk about custom cables and modding the HE-500 is a little to much for me. Is there a mini-amp that works great with the HE-500 using the stock HE-500 cable? I plan on connecting the headphones to my PC.
post #8414 of 14534
Quote:
Originally Posted by Sonido View Post
 

http://www.amazon.com/HOSA-Stereo-4-Inch-Phone-Female/dp/B000068O5D

 

+

 

2 x http://www.amazon.com/Pyle-Pro-PCBL34-Gauge-Female-Banana/dp/B004HJ5JPQ

 

=

 

MATHEMATICAL! (~$20)

 

(Careful with shared ground/resistance matching.)

Will work with the Emotiva since it has shared ground.

 

Lol I guess the holy grail now is to find a decent $20 speaker amp that uses common ground.

post #8415 of 14534

Sonido, thanks for all your help. One last question -- what is the difference between chopping off the TRS on the stock Hifiman cable and chopping the ends off of that TRS splitter? It seems like I would have R+, R-, L+, L- either way (unless I'm wrong about this part?...). Or could I get a TRS extension cable (female to male) and chop the end off of that, since it would be cheaper? I realize that figuring out which wire is which could be a hassle, but I figure that it might be easier if I could carefully cut it open at the TRS jack and see which wires in the cable are connected to which parts of the jack. But cutting the mono ends off that splitter seems simpler because then R and L would already be separated and I'd just have to figure out polarity. 

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