[jamato8]

I would have to agree that from my experience it takes some voltage and unrestricted current to make the 627 swing. As always, it is in the implementation.

 

[HeadphoneAddict]

I've been using the AD797 x2 in LR and AD8397 in the buffers plus LTC6234 in the DAC since 11/5/07 and like it too much to change anything. This was the second round of opamp rolling after the OPA2111/AD8397/AD8656 in the LR/BUFF/DAC positions. I might some day try it with the buffers bypassed, but there is no rush.

I also have a pair of LM4562, LME49720 or LMH6653 to try in the buffers, since I never got around to them. The OPA2111 in LR is IMHO better than the stock AD823 or the AD8066 in LR, but I haven't tried my AD746, my pair of AD744 on a 2:1 or my LTC6241-HV in LR yet either.

 

[jamato8]

Quote:

Originally Posted by Shopper /img/forum/go_quote.gif True. Btw, why hasn't anyone tried the OPA2365 or the OPA2727? They should be great for the I/V conversion after the DAC.

There are so many, maybe too many, choices.

 

[PPkiller]

Quote:

Originally Posted by jamato8 /img/forum/go_quote.gif I would have to agree that from my experience it takes some voltage and unrestricted current to make the 627 swing. As always, it is in the implementation.

maybe that's why i can hear a difference with battery powered and power adaptor powered..

 

[cafe zeenuts]

I was using OPA627BP before in my D1, i just pop LT1364 in the L/R. The sound is much better then OPA627BP dont know why, i thought the OPA627BP is one of the top opamp on the market.

Listening to the Ultrasone CD track 2 the drums is just amazing.

I guess maybe the D1 is not giving it enought juice to drive the OPA627BP.

 

[PPkiller]

are you able to describe the differences between lt1364 and opa627bp? the samples i ordered should be on the way..

 

[tracyrick]

Is the ibasso optical cable that comes with the D1 Toslink to mini, or Toslink to Toslink?

 

[PPkiller]

base on my experience with opa627 with ad8397, those two are not a match.
they will sound very bass focus and has a very recess treble... with 8066 it is much more balance.. treble sounds where they should be just that it is not that good sounding when compared to some of the opamps(i did some comparison, 627 treble seems to sound more natural, while although other opamps(ad8599) sound nicer, they too sound higher pitch which might explain why they do better in treble).

the bass from ad8397 is very very good. but 8066 make it sound better by adding a 'touch/definition' to the bass. it sounds to me to have more hi-def, i can pinpoint where exactly the bass came from. with ad8397, i get the 'woof'/bass slam feeling but i can't pinpoint where it came from like how ad8066 did.

i'm waiting for lmh6655 as well to try in the buffer section. the specs look good, hopefully it will do better.

 

[musicmaker]

So I've done a fair bit of listening with a bunch of opamps in the LR and buffer sections, with the line out of my iriver feeding the D1. I feel the amp section of the D1 feels pretty congested especially when dealing with complex sections of music (many instruments, voices etc). While opamp rolling has certainly made the amp section a lot better (especially with the Ad797), I still feel the amp section is still lacking (the airiness, separation, soundstage) ? I can quite put my finger on it but there is something about the amp section that really bothers me. Perhaps I'm just spoiled by my RSA XP-7.

Now with the DAC its a different story, with the optical out of the iRiver music comes to life. The DAC's great but I'm disappointed with the amp. Is it just me or does anyone feel the same ?

 

[jirams]

TosLink 2 TosLink

 

[tracyrick]

Thanks jirams. I finally talked myself into ordering a D1 on Sat. for my H140. Looks like I can't hook up with the included cable then. Was hoping to hear the sound via optical immediately. Can't order a custom cable until I receive the D1 and I'm sure about the length I need with my portable setup. Will probably get some type of camera bag.

musicmaker - I can't wait to find out for myself! I'm currently using a Portaphile V2 Maxxed with my H140. My big questions that I will prove to myself will be: 1. Does the D1 amp and DAC sound better together than my V2 amp? 2. Or does the D1 DAC (amp not used) hooked up to my V2 amp sound the best? Either way I'm hoping to get improved SQ by buying the D1.

 

[cafe zeenuts]

Quote:

Originally Posted by PPkiller /img/forum/go_quote.gif are you able to describe the differences between lt1364 and opa627bp? the samples i ordered should be on the way..

In my opinion the diferences is that the LT1364 is able to produce better snare drum sound better then OPA627BP it has more timbre, treble has a bit more detail more natural sound. And it has added a bit more airiness to the overall sound.

 

[jamato8]

Quote:

Originally Posted by musicmaker /img/forum/go_quote.gif So I've done a fair bit of listening with a bunch of opamps in the LR and buffer sections, with the line out of my iriver feeding the D1. I feel the amp section of the D1 feels pretty congested especially when dealing with complex sections of music (many instruments, voices etc). While opamp rolling has certainly made the amp section a lot better (especially with the Ad797), I still feel the amp section is still lacking (the airiness, separation, soundstage) ? I can quite put my finger on it but there is something about the amp section that really bothers me. Perhaps I'm just spoiled by my RSA XP-7. Now with the DAC its a different story, with the optical out of the iRiver music comes to life. The DAC's great but I'm disappointed with the amp. Is it just me or does anyone feel the same ?

How many hours are on the D1? I find that in these finer musical qualities that it is the burn in that either makes or breaks the finer points. If they clean up with time great if not then it is just the intrinsic quality of the amp. I found that with time the amp did open up more and with correct opamp use.

 

[mrarroyo]

FWIW, I truly think any amp should be allowed to settle before you start making changes to it, op-amps or caps or what ever. If the amp is not settled how do you know that the chage was brought by the new what ever or by additional burn in?

Just my opinion.

 

[PPkiller]

Quote:

Originally Posted by cafe zeenuts /img/forum/go_quote.gif In my opinion the diferences is that the LT1364 is able to produce better snare drum sound better then OPA627BP it has more timbre, treble has a bit more detail more natural sound. And it has added a bit more airiness to the overall sound.

thanks...