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Why is the Little Dot 1+ recommended for low-impedance cans? - Page 2

post #16 of 21
4/1/12 at 11:33pm
Thread Starter 

In fact exaggerated subbass is one of the apparent problems with the setup (see my complaints of "low-frequency noise"), so if what you say is true perhaps the impedance mismatch is contributing to that issue.  I haven't had any objections to the highs, which with good tubes are sparkly and clean.  Overall, the LD seems to have a 'dark' sound character, although it brightened up a lot when I rolled the LT1364 for a while.

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post #17 of 21
4/1/12 at 11:57pm
Quote:
Originally Posted by sacheie View Post

Magick Man, I agree normally an opamp should have lower output impedance.  My understanding is that the output transistors which come after the opamp, or perhaps the "Vbe multiplier," cause the elevated output Z.  Some discussion of the LD 1+ circuit can be found here:
http://mail.audiokarma.net/forums/showthread.php?t=274126

I think he just got his wires crossed. It's well less than 32ohms.
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post #18 of 21
4/2/12 at 8:54am

If you're interested in measuring it yourself, you could check out this post:

http://www.head-fi.org/t/603269/little-dot-mk-v-output-impedance

 

Someone gives good directions of how to measure output impedance with a soundcard and a free program.

 

Also, I didn't know about that post where David mentions the output impedance of the LDI+.  I can believe it.  Especially after seeing E9 measurements for the 1/8" headphone jack (43 ohms!!).  They may have put some safeguards in place, that happen to have increased the output impedance, so that people don't damage their IEMs or something.

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post #19 of 21
9/9/12 at 9:31am

Anytime tried this with an 8 ohm IEM?

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post #20 of 21
9/10/12 at 7:09am

In terms of output impedance I had some experience after changing my portable amp from a Fiio E5 to a E17.

First change when listening to my Denon 1001: wow, much better bass.

It was much more precise, while having that Denon-like oomph that made it almost sound like the Denon 2000 I had test-listened back then.

The treble also got some clarity I was really enjoying.

I would say, output impedance matching is important, but don't take it to serious, because, you know, in the end it only matters that you have fun with your setup!

If it sounds good to you, don't think about unimportant things like specs.

Just enjoy the music!dt880smile.png 
 

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post #21 of 21
9/10/12 at 7:32am
Quote:
Originally Posted by CollectoR13 View Post

In terms of output impedance I had some experience after changing my portable amp from a Fiio E5 to a E17.

First change when listening to my Denon 1001: wow, much better bass.

It was much more precise, while having that Denon-like oomph that made it almost sound like the Denon 2000 I had test-listened back then.

The treble also got some clarity I was really enjoying.

I would say, output impedance matching is important, but don't take it to serious, because, you know, in the end it only matters that you have fun with your setup!

If it sounds good to you, don't think about unimportant things like specs.

Just enjoy the music!dt880smile.png 
 

that is true, I just want to be on the safe side :D

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