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Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp
Mar 21, 2008 at 8:54 PM Post #2,131 of 9,388
Quote:

Originally Posted by mADmAN /img/forum/go_quote.gif
its there... i just didnt post up pix of it coz nuttin was done to the amp board other than replacing the stock opamps with 2*OPA2107s.


Ow, Ok. It just seemed weird, all those shots from different angles and no amp board.
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Mar 21, 2008 at 9:06 PM Post #2,133 of 9,388
Mar 21, 2008 at 9:06 PM Post #2,134 of 9,388
Quote:

Originally Posted by souperman /img/forum/go_quote.gif
OPA2107 works great in the headphone section. I just got mine. LOVING OPA2107's more than LT1364's and LT1469's!


Another to add to my list!
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Mar 21, 2008 at 11:36 PM Post #2,135 of 9,388
I don't know if anyone's tried this combo, but after ~60 hrs of burn-in, I ditched all the opamps from the Zero and tried some I had on hand: opa627s, LM6172, LM4562, OPA2132, OPA2134, AD825.

OPA627s were obviously great in the DAC section, but surprisingly, AD825 came very close. In fact, I'd say AD825 was a bit more musical for some of the Jazz stuff I have. I'll let it burn-in a little more with AD825 and see.

As for the headamp section, a pair of OP275 hit the spot for my Grado's. I'm tapping my foot as I type this.
 
Mar 22, 2008 at 6:07 AM Post #2,136 of 9,388
yeah i love the OPA2107s in the headamp section as well....

makes everything more airy and has an mildly increased soundstage.

only thing is that because opamp gives an airy sound sig. my mids are recessed again. with the stock opamps the mids just jumped out at me.

this is very apparent to me especially since i listen to metal on a Beyer DT990
 
Mar 22, 2008 at 3:13 PM Post #2,137 of 9,388
I've just asked Lawrence to replace stock opamps to 627 for me to buy. And he said that 1 module of 627 is $61 !
That means i have to spend 122$ only for DAC's opamps upgrade, but it doubles the product price. How do you go for this?!
 
Mar 22, 2008 at 3:18 PM Post #2,138 of 9,388
Quote:

Originally Posted by fizmax /img/forum/go_quote.gif
I've just asked Lawrence to replace stock opamps to 627 for me to buy. And he said that 1 module of 627 is $61 !
That means i have to spend 122$ only for DAC's opamps upgrade, but it doubles the product price. How do you go for this?!


No, he means two OPA627's on an adapter installed in your Zero, for the $61.
Module = 2 on the adapter.
 
Mar 22, 2008 at 4:31 PM Post #2,139 of 9,388
Quote:

Originally Posted by Penchum /img/forum/go_quote.gif
No, he means two OPA627's on an adapter installed in your Zero, for the $61.
Module = 2 on the adapter.


Still, you're better of with a very easy DIY and save $30. I bought them and they've arrived and waiting for the ZERO to come
frown.gif


Just e-mail Eddie for the following items:
627BP 2pc $11x2=$22 USD
1x single to dual socket $2.5 USD
$5 USD by registered air mail.
Total $29.5 USD for that
 
Mar 22, 2008 at 4:58 PM Post #2,140 of 9,388
Quote:

Originally Posted by fizmax /img/forum/go_quote.gif
I've just asked Lawrence to replace stock opamps to 627 for me to buy. And he said that 1 module of 627 is $61 !
That means i have to spend 122$ only for DAC's opamps upgrade, but it doubles the product price. How do you go for this?!


Like I said http://www.head-fi.org/forums/3976819-post2351.html

wink.gif


Hey Fl00r, I paid DIY US$ 1,- more
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Mar 22, 2008 at 5:22 PM Post #2,141 of 9,388
Mar 22, 2008 at 5:26 PM Post #2,142 of 9,388
Quote:

Just e-mail Eddie for the following items:
627BP 2pc $11x2=$22 USD
1x single to dual socket $2.5 USD
$5 USD by registered air mail.
Total $29.5 USD for that



Can you tell me what is the difference between OPA 627 AM and BP, cause it's nearly double difference in the price. And why should I get single to dual socket if there are all needable sockets on the board?
 
Mar 22, 2008 at 5:32 PM Post #2,143 of 9,388
Quote:

Originally Posted by fizmax /img/forum/go_quote.gif
Can you tell me what is the difference between OPA 627 AM and BP, cause it's nearly double difference in the price. And why should I get single to dual socket if there are all needable sockets on the board?


This one's for the experts: come on in Dave
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Mar 22, 2008 at 5:53 PM Post #2,145 of 9,388
Quote:

Originally Posted by fizmax /img/forum/go_quote.gif
Can you tell me what is the difference between OPA 627 AM and BP, cause it's nearly double difference in the price. And why should I get single to dual socket if there are all needable sockets on the board?


627A is inferior to 627B.
The M and the P describe the mounting form: M=SOIC P=DIP.
ZERO needs DIPs and dual ops. The 627B is a single op, you need 2 of it and an adapter.
 
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