[ehlarson]

There are some single op amps available that are not available in dual formats that seem to have a good reputation.

With the availability of an adapter like this:

http://www.cimarrontechnology.com/in...PROD&ProdID=24

it seems feasible to use these in the D1. I am wondering if anyone has some experience with the potential benefits of these single op amps, and what the pitfalls might be.

 

[souperman]

oops.

 

[HiFlight]

Quote:

Originally Posted by paladinca /img/forum/go_quote.gif Ron, could you describe the difference in sound characteristic between LMH6643 , LM4562, and the upgraded version of the LM4562 as buffers? Thanks.

No, it is very hard for me to describe such subtle differences in soundstage and shading.

Perhaps the LMH6643 might be a little warmer than the LM4562. The improved LM sounds similar but better all around than the LM4562. Not as sterile sounding.

Any of the 3 would be hard to tell apart unless you compare them side-by-side with the same music and same equipment.

 

[HiFlight]

Quote:

Originally Posted by itsborken /img/forum/go_quote.gif Searched for the product and they are called ferrite chokes. Sometimes they loop the cable around the ferrite core once or twice to improve it's functionality. Anyway, some USB cables have them built-in. Here's a link with a snap-on ferrite choke for existing cables: vendor ferrite choke Wikipedia ferrite bead writeup There's no guarantee it will work but you may get lucky and have it solve your problem.

Ferrite chokes will not work for noise such as you describe. They work at RF frequencies, not audible frequencies. I have used a variety of ferrite chokes with my amateur radio equipment with good results, but the frequencies involved were MUCH higher than than the audible range.

I don't recall this issue being a problem with the D1, perhaps I am mistaken, but I think most of the issues involved the Move.

 

[powertoold]

Ok, so I tried my roommate's D1, but I hear some line noise on my SF5Pros when nothing is connected. Does this line noise go away if I changed the opamps on the unit, or will I have to deal with it?

 

[xnothingpoetic]

Quote:

Originally Posted by powertoold /img/forum/go_quote.gif Ok, so I tried my roommate's D1, but I hear some line noise on my SF5Pros when nothing is connected. Does this line noise go away if I changed the opamps on the unit, or will I have to deal with it?

I get no noise, except with put through usb, then there is a very slight hiss.

What are you playing your music off of (comp/iriver/ext)?

Chances are you may have to live with it if it's a noisy usb. Although, if it is the D1 itself then you may have to send it in for repair as it should be making no noise.

 

[powertoold]

No, when no inputs are connected (no usb, etc.), there is hiss.

 

[yuheng]

if i m not mistaken, USB connection will be like tat

 

[powertoold]

Keep in mind that I am using a really sensitive IEM SF5Pro.

I want to know if changing opamps will decrease the default hiss in any way?

 

[luidge]

I also get strong noise, it is when it is connected to the wallwart and i apply a little pressure on the D1. Then i get strong noise if i remove, say my H140, then it become silent again. Don't know what cause this, it is sort of annoying but not major.

 

[souperman]

Quote:

Originally Posted by HiFlight /img/forum/go_quote.gif No, it is very hard for me to describe such subtle differences in soundstage and shading. Perhaps the LMH6643 might be a little warmer than the LM4562. The improved LM sounds similar but better all around than the LM4562. Not as sterile sounding. Any of the 3 would be hard to tell apart unless you compare them side-by-side with the same music and same equipment.

What are the new LM4562's called? Or have they completely replaced the old LM4562's?

 

[Dexdexter]

Quote:

Originally Posted by xnothingpoetic /img/forum/go_quote.gif I have it burning in right now but so far I have about an hour on it. 399 to go..

Ah, still very much in its infancy, then. Relax and enjoy the metamorphosis!

 

[HeadphoneAddict]

Quote:

Originally Posted by souperman /img/forum/go_quote.gif What are the new LM4562's called? Or have they completely replaced the old LM4562's?

LME49720

I have 2 on the way...

 

[Sieg9198]

I thought both 49720 and 4562 is a totally different thing??

 

[yuheng]

yeah, it have both different signature