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MiuAudio MRB Audiophile DIY HeadAmp KIt - Page 5

post #61 of 71
8/28/12 at 3:17pm
Quote:
Originally Posted by Tilpo View Post


Why would you want one of those with the MRB in any case?
The MRB already has a pretty high output impedance. In addition to that you can make it pretty much any value you want by changing the value of R5 and R14.
The standard value of R14/R5 is 30 ohm, which corresponds to an output impedance of... 30 ohms.

Want what with the MRB?

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post #62 of 71
8/28/12 at 3:20pm
Quote:
Originally Posted by bowei006 View Post

Want what with the MRB?
The attenuator.
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post #63 of 71
8/28/12 at 3:25pm

Because of its high output impedance it really does hiss with IEMs, a attenuator would prevent that! I have tried! (and succeeded!)

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post #64 of 71
8/29/12 at 9:10am

Does it hiss a lot with the volume turned all the way down or with a shorted input? Just curious how much is the output stage. If the hiss just goes up with volume, it's not that big of a deal. The output adapter is really the wrong way to go for almost all IEMs. Thus seems to be made for less effecient high impedance headphones and may be great for that purpose. Forcing it into High effeciency low impedance IEM use may be doing it an injustice. It really shouldn't work as well that way.

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post #65 of 71
8/29/12 at 9:19am
Quote:
Originally Posted by goodvibes View Post

Does it hiss a lot with the volume turned all the way down or with a shorted input? Just curious how much is the output stage. If the hiss just goes up with volume, it's not that big of a deal. The output adapter is really the wrong way to go for almost all IEMs. Thus seems to be made for less effecient high impedance headphones and may be great for that purpose. Forcing it into High effeciency low impedance IEM use may be doing it an injustice. It really shouldn't work as well that way.
Testing with nothing connected at the input:

The hiss is constant and not volume dependent.

On my HD 25-1 II's the hiss is barely audible.
But on my high sensitivity IEM's, the IE80's, it is loud enough to be audible during soft passages. And definitely audible when nothing is playing.
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post #66 of 71
8/30/12 at 12:18pm

Sounds like it's for high impedance cans and er4s'.

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post #67 of 71
8/30/12 at 12:27pm
Not necessarily. Just avoid high sensitivity IEM's.

And the hiss is not that bad. You won't notice any of it during normal music playback.
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post #68 of 71
8/30/12 at 3:21pm

I wasn't just referring to the noise, the high output impedance isn't optimum for most IEMs either.

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post #69 of 71
8/30/12 at 4:22pm
The TF10s arent super sensitive but they still hiss so yeah. Most earphones that are designated "IEMs" in the sense of being in ear monitors will most likely hiss with these with default settings. And as this is a diy, as swimssony has seen with his short, it may not be best to test with iems or expensive sensitive gear at first. I tested first run with cheap generic earbuds found in the etc drawer to make sure nothing was wrong
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post #70 of 71
8/31/12 at 3:12am
Quote:
Originally Posted by bowei006 View Post

The TF10s arent super sensitive but they still hiss so yeah. Most earphones that are designated "IEMs" in the sense of being in ear monitors will most likely hiss with these with default settings. And as this is a diy, as swimssony has seen with his short, it may not be best to test with iems or expensive sensitive gear at first. I tested first run with cheap generic earbuds found in the etc drawer to make sure nothing was wrong

Woo! Test IEM's.

I ran out like warm buns over the counter with those when building my B22. Blew up 3 IEM's, and one cheap full sizer!

(don't mind my using a Dutch expression)
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post #71 of 71
8/31/12 at 3:31am
And thats why I didnt try with costly sets first biggrin.gif
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