[hungryhungryzit]

I've got the LME49990 in the I/Vs on my Titanium HD. Any recommendations for the buffer? Looking to add a tinge more bass without hurting the detail and transparency.

 

[PurpleAngel]

Quote:

I've got the LME49990 in the I/Vs on my Titanium HD. Any recommendations for the buffer? Looking to add a tinge more bass without hurting the detail and transparency.

Just get a third LME49990, I believe it's a little safer to get all matching op-amps.

 

[hungryhungryzit]

Quote:

Just get a third LME49990, I believe it's a little safer to get all matching op-amps.

Would be 2, dual buffers, and in that case I don't need to get anything... I don't think. People keep saying the headphone out on the Titanium HD doesn't use the buffers. I got around that with a RCA adapter figuring since it doesn't have a dedicated amp it would deliver the same power over both, which it did. I'll just stick with the headphone output if there's nothing worth trying.

 

[genclaymore]

The headphone out on the TI HD doesn't use the buffers, only the RCA out on the card use all the op-amps. While headphone out only uses the Two I/v sockets.

 

[stv014]

Quote:

do you know how to read schematics?
[...]

 
Maybe you should know how to read an entire post in context before posting corrections to it to prove how much smarter you are.

Welcome to my block list.

 

[qusp]

haha i'm crushed… bye bye
 
it was a genuine question, I had to ask because you didnt really make a great deal of sense. wasnt sarcasm, the line above is an example of sarcasm. I asked as a basis for what came after, this thread in particular gets a lot of people who do not know, but have gleamed a lot of info about the circuit from reading posts.

 

[kiteki]

Do you guys notice the difference between A and B track? 
http://bursonaudioblog.blogspot.com/2012/02/marantz-cd72-hd-opamp-mod-with-sample.html
 
Been considering to mod my CDP with their opamps. 
Thanks. 

 
Can someone give me a detailed explanation what to listen for? I've been going over and over and can't hear a single bit of difference. Maybe I'm just untrained, deaf or then the opamp differences are so small I couldn't care less.

 
So, how exactly are you supposed to hear the difference between op-amps, when they're recorded?
 
Aren't you listening to the 10 cent op-amp in your iPod Shuffle, or the LME49990 in your NAD M51, irrespective to any recording you're listening to?

 

[hekeli]

Quote:

 
So, how exactly are you supposed to hear the difference between op-amps, when they're recorded?

 
Obviously there has to be a clear difference if Burson and some random guy hype it so much?

 

[kiteki]

 

 
Obviously there has to be a clear difference if Burson and some random guy hype it so much?

 
I think you'll find your answer on page 105 in this document - http://www.sg-acoustics.ch/analogue_audio/ic_opamps/pdf/opamp_distortion.pdf,
 
and here - http://www.audio-gd.com/Pro/diy/OPA/OPAEN.htm.
 
 
I think if you compare OPA-MOON and the AD8610 / AD8620, you will hear a "clear difference", naturally this difference is dependant on your perceptivity and how revealing your equipment is, yet it's a much more important difference than what cables or power conditioners can offer you.
 
The difference is subtle like 5%, but sometimes 5% is all that's necessary to lift a digital veil, or a 5% enhancement in detail, like cleaning a window or polishing a diamond, in which case the emotional reward and involvement factor will be there.
 
Some people say it's all marketing, but they have no idea what they're talking about or they're just deaf - all op-amps look exactly the same and my favorite sounding one costs around $5.  That's like a cheeseburger for high fidelity.

 

[michelino]

Hi everybody!
This thread is sooo long (277pages ) so I want to ask you what opamp should fit better in my Marantz CD5003... The stock are SOIC8 njm2068, one per channel. I've tested opa2107 and opa1612. The 1612 is way more detailed respect to the 2107, more analytical and alive, with a better bass (bigger and more controlled), but I miss the brighter high frequencies of the 2107.
I've got on my hand LM4562, OPA2211, OPA1642, OPA2132 and I'm waiting AD8599 and AD8620 samples. What should I try?
Thanks

 

[Tommy Thong]

Hi everybody!
This thread is sooo long (277pages ) so I want to ask you what opamp should fit better in my Marantz CD5003... The stock are SOIC8 njm2068, one per channel. I've tested opa2107 and opa1612. The 1612 is way more detailed respect to the 2107, more analytical and alive, with a better bass (bigger and more controlled), but I miss the brighter high frequencies of the 2107.
I've got on my hand LM4562, OPA2211, OPA1642, OPA2132 and I'm waiting AD8599 and AD8620 samples. What should I try?
Thanks

just try opa1662 (if you want something smooth on mids) or lm4562ma (nice on tops freq & thigh bass) but changing soic opamp is tricky

 

[Edifier12]

Hi, Sorry for the laziness of not going through all 277 pages worth of information. I basically have a Sennheiser HD598 (rated at 50ohms?) connected to the Asus Xonar Essence STX. Mainly use them for gaming, then music and movies. Looking for a good all around opamp rolling without really compromising on bass or tremble as much as possible. Just want a good balance replacement to the stock really.
 
What would you guys recommend ? I've seen recommendation for the LME49860NA and the LME49720HA and such, then there are all these other different one as well... need some help deciding thanks lol.

 

[WiR3D]

Quote:

Hi, Sorry for the laziness of not going through all 277 pages worth of information. I basically have a Sennheiser HD598 (rated at 50ohms?) connected to the Asus Xonar Essence STX. Mainly use them for gaming, then music and movies. Looking for a good all around opamp rolling without really compromising on bass or tremble as much as possible. Just want a good balance replacement to the stock really.
 
What would you guys recommend ? I've seen recommendation for the LME49860NA and the LME49720HA and such, then there are all these other different one as well... need some help deciding thanks lol.

AD797 (could be unstable and eventually fail, but the best clarity), LME49990 - not a single complaint, almost equal to the AD797, and then the THS4032 - a smoother sound, with probably the best imaging, but SLIGHTLY smaller soundstage compared to the AD797.
 
The entire LME49720 based range is a compromised design.

 

[PurpleAngel]

Quote:

Hi, Sorry for the laziness of not going through all 277 pages worth of information. I basically have a Sennheiser HD598 (rated at 50ohms?) connected to the Asus Xonar Essence STX. Mainly use them for gaming, then music and movies. Looking for a good all around opamp rolling without really compromising on bass or tremble as much as possible. Just want a good balance replacement to the stock really.
 
What would you guys recommend ? I've seen recommendation for the LME49860NA and the LME49720HA and such, then there are all these other different one as well... need some help deciding thanks lol.

The LM4652 (STX's buffer op-amp), LME49720NA & LME49860NA are the same op-amp, the LME49860NA is just the cherry pick (tested with better voltage range).

 

[wakibaki]

Quote:

Warning:  The LME49990 is a JFET op-amp

 
Is it? It doesn't say so anywhere in the datasheet.
 
Jfet opamps are usually characterised by an input bias current in the picoamp range. The LME49990 has an input bias current in the range 30-1000nA which is more typical of a bjt input.
 
See page 190 of Horowitz & Hill.
 
http://books.google.co.uk/books?id=bkOMDgwFA28C&pg=PA190&lpg=PA190&dq=typical+bjt+input+opamp+bias+current&source=bl&ots=F3cnVDc0Yw&sig=u90V9iQ3wq7nAJFZvfiSi9mnRkw&hl=en&sa=X&ei=MUFiUMSGJoiWhQfmz4H4Cw&redir_esc=y#v=onepage&q=typical%20bjt%20input%20opamp%20bias%20current&f=false
 
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