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Twisted Pear Audio Opus DAC - Page 16

post #226 of 987
12/17/07 at 12:39am
Basically:

Better SNR
Better THD
DSD support (SACD)
More expensive
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post #227 of 987
12/17/07 at 2:09am
Is there a big difference between the Active IV versus a Passive IV?
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post #228 of 987
12/17/07 at 9:18am
In our testing, not much that we can hear. It will come down to personal preference.
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post #229 of 987
12/18/07 at 3:25pm
Early look at the discrete active i/v stage...

diyAudio Forums - Discrete Super Symmetric(I think) Opamp for I/V Etc...
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post #230 of 987
12/18/07 at 11:20pm
Alright so it basically means we have to get a ballise or a buffer to go single ended now? or am i missing something?
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post #231 of 987
12/19/07 at 3:55am
Yeah to go single ended you have to get the opus DAC + the ballsie. but what i want to know is what the usb receiver does?
is it a USB input? or is it another DAC all togetheR? anyone tell me how much they cost to? twisted pear didnt reply my mails.
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post #232 of 987
12/19/07 at 4:48am
Cata1yst: You can just use "half" of the OPUS to get a single-ended signal, you don't need to use the Ballsie, but it does allow you to get rid of the output caps (as I've heard, not positive) and it's a much stronger signal as opposed to using half of the OPUS.

koike: The USB receiver uses the PCM2707 which outputs I2S to the OPUS DAC for DAC duties, but since the PCM2707 has its own DAC, the board also lets you take analog output straight from it.

The prices are all on the site.
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post #233 of 987
12/19/07 at 7:23am
so when will brian stock the dacs?
hahaha i would like 1 for my bijou and b22
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post #234 of 987
12/20/07 at 4:56pm
Quote:
Originally Posted by BrianDonegan View Post
With the active I/V, you would simply omit those parts and go direct to the I/V board. Our current favorite (no pun intended) is based on the THS4131 symmetric fully differential op-amp.

So does this mean the discrete I/V idea is out of the picture now ?
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post #235 of 987
12/20/07 at 5:20pm
We are making some minor layout changes to the DAC boards and should have them back in stock by the end of January (hopefully before that).

We are actually working on a fully discrete balance I/V, which you can see the current state of here: diyAudio Forums - Discrete Super Symmetric(I think) Opamp for I/V Etc...
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post #236 of 987
12/21/07 at 8:46pm
Quote:
Originally Posted by FallenAngel View Post
Cata1yst: You can just use "half" of the OPUS to get a single-ended signal, you don't need to use the Ballsie, but it does allow you to get rid of the output caps (as I've heard, not positive) and it's a much stronger signal as opposed to using half of the OPUS.

The prices are all on the site.
Alright, for some reason his Active/Passive I.V post confused the living daylight out of me...i thought i would have to use a ballise after the changes

thanks for clearing it up FallenAngel
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post #237 of 987
12/21/07 at 9:05pm
Sorry, to confuse. The I/V isn't needed for the Opus, only the COD, because it is a current output DAC.

I have about 20 COD modules that I will be putting up on the site in the next week or so.
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post #238 of 987
12/21/07 at 11:15pm
I'll have to keep an eye out for that.
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post #239 of 987
12/27/07 at 12:00am
Well I got back from a 6 week out of town job today, and my Opus DAC was waiting for me, along with my new β22.

This Opus has a Zapfilter MkII discrete output installed, and the sound is phenominal.

No real impressions until I've had a few days to spend with it, but I have a big, stupid grin on my face that won't go away.






The Opus and the β22 were built by fierce_freak, and I can't begin to tell you how professional his work is.
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post #240 of 987
12/27/07 at 2:52am
What's on the front panel, an on button and source selector?
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