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Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp - Page 76

post #1126 of 9226
1/28/08 at 12:44pm
Quote:
Originally Posted by Gaco View Post
Ok. But since your chart shows combinations of two opamps at once, one DAC one Amp, you must have held one constant on the headphone board if it had two slots?
The two on the headphone board are identical since they are just L & R. If he shows LT1361 / LT1469, it means the DAC opamp is a single LT1361, and there are two LT1469s on the headphone board, one for each channel.

An exception would be the opa627 because it requires two opamps + an adapter to fill a single spot. I ordered two OPA627 + browndog adapter to replace the opamp on the DAC.
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post #1127 of 9226
1/28/08 at 12:47pm
Quote:
Originally Posted by biph911 View Post
The two on the headphone board are identical since they are just L & R. If he shows LT1361 / LT1469, it means the DAC opamp is a single LT1361, and there are two LT1469s on the headphone board, one for each channel.

An exception would be the opa627 because it requires two opamps + an adapter to fill a single spot. I ordered two OPA627 + browndog adapter to replace the opamp on the DAC.
That makes perfect sense.. thanks

I wonder why Lawrence present the OPA 627 like it's the best since sliced bread but Penchum gave it a rating of "only" good in all combinations. I know it might have something to do with personal taste and the headphones, but it doesn't make the choice easier for a n00b like me. I think Penchum used senn 650's when he tested, I wonder what Lawrence used..
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post #1128 of 9226
1/28/08 at 12:51pm
Thread Starter 
Quote:
Originally Posted by Gaco View Post
That makes perfect sense.. thanks
Yepper, it made for some serious swapping action!
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post #1129 of 9226
1/28/08 at 12:52pm
Thread Starter 
I have updated the review with better pics and changed the layout as well. If anyone has Opamp info for the chart, PM me and I'll add them in.
Thanks!
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post #1130 of 9226
1/28/08 at 1:05pm
Quote:
Originally Posted by Gaco View Post
I wonder why Lawrence present the OPA 627 like it's the best since sliced bread but Penchum gave it a rating of "only" good in all combinations.
He actually rates the OPA627 as great on the DAC side in each combo. The OPA627 hasn't been used on the headphone side (yet).

Quote:
OPA627s + LT1469 DAC=great, phone=good

OPA627s + LT1364 DAC=great, phone=great

OPA627s + LT1361 DAC=great, phone=great

OPA627s + LT1057 DAC=great, phone=good

OPA627s + LM4562 DAC=great, phone=great
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post #1131 of 9226
1/28/08 at 1:07pm
Nice, I just got in touch with Lawrence. He tells me that he recommends the "Burr Brown OPA 627 BP(single, ceramic) on Browndog adaptor" for the headphone opamps, and I'll take his word for it.

What about the DAC opamp, how would you rate the default, Penchum? On your chart you say everything goes good with OPA627, but since nothing goes "bad" or "great" either I don't know what to choose here. I could go with the standard I guess, but I really want the best I can get from the beginning since I probably won't ever mod the Zero again as I've mentioned

EDIT: Oh you just updated the chart with more combos for the OPA627, sweet! Gonna have a look now..
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post #1132 of 9226
1/28/08 at 1:10pm
Quote:
Originally Posted by biph911 View Post
He actually rates the OPA627 as great on the DAC side in each combo. The OPA627 hasn't been used on the headphone side (yet).
Who is "he" I thought Penchum made the chart
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post #1133 of 9226
1/28/08 at 1:16pm
I wonder about this:

Quote:
Originally Posted by biph911
Analog device DY2000 (dual, metal)
Price: US$35.
Comment : It provided very similar results to the DY2000 ceramic but the sound is ten times better with their punch , detail , range of frequency ….. especially the naturality.
- what is that? Doesn't sound like an opamp compoent? Worth buying?
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post #1134 of 9226
1/28/08 at 1:17pm
Quote:
Originally Posted by Gaco View Post
Who is "he" I thought Penchum made the chart
The "he" in that sentence is Penchum. Sorry for my errant pronoun usage.
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post #1135 of 9226
1/28/08 at 1:36pm
Quote:
Originally Posted by biph911 View Post
The "he" in that sentence is Penchum. Sorry for my errant pronoun usage.
What the.... did he just correct that or did I mis-read it the first time around?

So it looks like LO1469, LT1364 and LM4562 would be a good choice. I've emailed Lawrence back asking if he's got any of these in stock. Do you remember any differences between these three in particular Penchum?
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post #1136 of 9226
1/28/08 at 1:49pm
hello, my package has arrived to sweden. what does in transit mean?
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post #1137 of 9226
1/28/08 at 2:00pm
Quote:
Originally Posted by davve View Post
hello, my package has arrived to sweden. what does in transit mean?
It means it's that much closer to your front door! Seriously though, "in transit" means "en route" or "in the process of transportation"....on its way.

Should be soon....enjoy!
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post #1138 of 9226
1/28/08 at 2:30pm
Thread Starter 
Quote:
Originally Posted by Gaco View Post
What the.... did he just correct that or did I mis-read it the first time around?

So it looks like LO1469, LT1364 and LM4562 would be a good choice. I've emailed Lawrence back asking if he's got any of these in stock. Do you remember any differences between these three in particular Penchum?
Ok, here we go... If you buy OPA627's on the dog, times 2 for the headphone board, this is going to cost like $122 at current Lawrence prices. That is too much I think! Since you don't have a Zero yet, and have no idea of the sound the default Opamps can give you (after burn-in), it is difficult to recommend you spend that much money on "untested to your ears" Opamps, for a $139 Zero. True? $122 vs $139....$122 vs $139....

Most here, who are using the OPA627s on the dog, are doing so in the DAC, not the headphone board. If you look at the chart, there are many "great" combinations and choices for the OPA627 in DAC, "others" in the headphone board.

It is up to you, and please do what you feel is best, but remember the teeth in you wallet, they do bite! Many folks here can help you find the LT Opamps after your Zero has arrived and you've had some "love" time.
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post #1139 of 9226
1/28/08 at 2:33pm
Thread Starter 
Quote:
Originally Posted by davve View Post
hello, my package has arrived to sweden. what does in transit mean?
davve, Hi! I'll be interested to hear how the Zero works with your DV! Keep us apprised!!
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post #1140 of 9226
1/28/08 at 2:53pm
Quote:
Originally Posted by Penchum View Post
Ok, here we go... If you buy OPA627's on the dog, times 2 for the headphone board, this is going to cost like $122 at current Lawrence prices. That is too much I think! Since you don't have a Zero yet, and have no idea of the sound the default Opamps can give you (after burn-in), it is difficult to recommend you spend that much money on "untested to your ears" Opamps, for a $139 Zero. True? $122 vs $139....$122 vs $139....

Most here, who are using the OPA627s on the dog, are doing so in the DAC, not the headphone board. If you look at the chart, there are many "great" combinations and choices for the OPA627 in DAC, "others" in the headphone board.

It is up to you, and please do what you feel is best, but remember the teeth in you wallet, they do bite! Many folks here can help you find the LT Opamps after your Zero has arrived and you've had some "love" time.
I dunno man.. I just want it overwith or something

I wonder why haven't anyone tried the OPA627s on headphone, is it because of the extra price you'd have to pay for two or what?

Ok I'll just throw the OPA627 on the DAC then, that seems to be the most normal, I can find more info on combos with that config it seems, and a lot cheaper also. On the headphones Lawrence offers the LT1057 which he says "Without a shadow of a doubt this op amp is the star of the the centry..." and so fourth (I think we all know this standard answer at this point - last cited on page 128) and the DY2000's which he also praised but I this OPA627/DY2000 combo is not on the chart so I dunno about it. Perhaps I should just go for the OPA627/LT1057, but then again they are only listed as "great/good" on the chart. Argh I don't know what to do!

At least I have the DAC opamp module pinned down now, I just need a couple of headphone opamps - though the three "great" in the chart is unavailable from Lawrence..
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