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Matrix M-Stage amp review: simple, cheap, and excellent. - Page 291

post #4351 of 4842

guys do i need 2x LM4562 or i should use one on the M-Stage

post #4352 of 4842
Quote:
Originally Posted by Shini44 View Post
 

guys do i need 2x LM4562 or i should use one on the M-Stage

 

http://www.ti.com/product/lm4562

 

Only need one. It's a dual channel opamp. 

post #4353 of 4842
Quote:
Originally Posted by chicolom View Post


I've tried a couple op-amps and the changes have always been minor, and certainly nothing like what you're describing.

I don't hear that much difference between the stock op-amp and the LM4562 I have in there now.

I haven't tried the stock OP AMP but the difference between the class a opa627 I got from Tam Audio and the lm4562 was certainly not minor to my ears at all. Opa627 was warm colored and muddy IMO and had a totally different tonality than lm4562. Maybe stock is closer to lm4562?
post #4354 of 4842
Warning: Spoiler! (Click to show)
Quote:
Originally Posted by Chris J View Post

You could argue that two single Op Amps on an adapter may sound worse than one dual Op Amp without an adapter board.
An adapter just adds more parasitic elements to the circuit.

This is how I look at it too. It also mirrors my personal experience going from opa627 (dual) to lm4562 (single). I wouldn't mind trying this lm49710x2 though.
Edited by nickwin - 9/11/13 at 4:47pm
post #4355 of 4842
Quote:
Originally Posted by nickwin View Post

I haven't tried the stock OP AMP but the difference between the class a opa627 I got from Tam Audio and the lm4562 was certainly not minor to my ears at all. Opa627 was warm colored and muddy IMO and had a totally different tonality than lm4562. Maybe stock is closer to lm4562?

The class A mod is indeed very warm. I think the normal opa627 might be better? And the stock is pretty close to the lm4562, with the exception of the treble.

post #4356 of 4842
Quote:
Originally Posted by elwappo99 View Post
 

 

http://www.ti.com/product/lm4562

 

Only need one. It's a dual channel opamp. 

 

http://www.mouser.com/ProductDetail/Texas-Instruments/LM4562NA-NOPB/?qs=sGAEpiMZZMtCHixnSjNA6JlKxGj6zye%252bDw5UwZXQkUk%3d

 

 

same? i don't think so :/  why does they have the same code yet not the same shape? 

post #4357 of 4842
Quote:
Originally Posted by Shini44 View Post
 
Quote:
Originally Posted by elwappo99 View Post
 

 

http://www.ti.com/product/lm4562

 

Only need one. It's a dual channel opamp. 

 

http://www.mouser.com/ProductDetail/Texas-Instruments/LM4562NA-NOPB/?qs=sGAEpiMZZMtCHixnSjNA6JlKxGj6zye%252bDw5UwZXQkUk%3d

 

 

same? i don't think so :/  why does they have the same code yet not the same shape? 

 

Yup, they are the same. You need the DIP8 package, which is what you have linked on mouser. 

 

The link on TI shows the SOIC package. Same identical operation, different size/shape.

post #4358 of 4842
Quote:
Originally Posted by elwappo99 View Post
 

 

Yup, they are the same. You need the DIP8 package, which is what you have linked on mouser. 

 

The link on TI shows the SOIC package. Same identical operation, different size/shape.

 

is the LME48710 is a single version of the LME4562?

post #4359 of 4842
Quote:
Originally Posted by Shini44 View Post
 

 

is the LME48710 is a single version of the LME4562?

 

You should try using the search function. Here is a link that clears some of this up for you:

 

http://www.head-fi.org/t/542563/asus-essence-one-headphone-amp-dac-cebit-2011/1005

post #4360 of 4842

Have you chek if the schema is compatible with the LME4710, the 627 is a jfet and the LME4710 is a bipolar ?

 

You can have noise and continus courant if you put a bipolar instead a jfet...

When I buy, chips, I take several ships.

The LME49860 have been prefered to the LME49710 on several discussions (similar sound but more natural, better mid, better on the voices, more soft).
The ADA4627 have been prefered to the OPA627 on several discussions (similar sound but more defined).
My prefered are OPA211 and OPA1611 (more soft).


Good tests

Proton


Edited by proton56 - 9/12/13 at 11:38am
post #4361 of 4842

I just tried the stock opamp since i had the amp with the 627 already installed and the difference is quite big. The stock one make the music less dynamics imo.

 

I ordered a LM4562, but until i get it i'll be putting the 627 back for sure :)

post #4362 of 4842
Quote:
Originally Posted by Xprime4 View Post
 

I just tried the stock opamp since i had the amp with the 627 already installed and the difference is quite big. The stock one make the music less dynamics imo.

 

I ordered a LM4562, but until i get it i'll be putting the 627 back for sure :)

Curious about what you are using for a dac and headphones? I agree with you in one respect; I also hear a big difference between the op627 and the stock opamp. Did you buy that op627 as a class A mod from Tam?

post #4363 of 4842
Quote:
Originally Posted by proton56 View Post

Have you chek if the schema is compatible with the LME4710, the 627 is a jfet and the LME4710 is a bipolar ?

You can have noise and continus courant if you put a bipolar instead a jfet...
When I buy, chips, I take several ships.
The LME49860 have been prefered to the LME49710 on several discussions (similar sound but more natural, better mid, better on the voices, more soft).

The ADA4627 have been prefered to the OPA627 on several discussions (similar sound but more defined).

My prefered are OPA211 and OPA1611 (more soft).


Good tests
Proton


Depends, depends, depends.....

Bipolar Junction Transistors can have lower noise than JFETs.
As for the idle current, again.....it depends, could be more could be less.
A lotof guys do a Class A mod which increase the bias current on the OP627.

But you always need to confirm that any replacement Op Amp you are using has the same pin out and it Must Be Unity Gain STABLE to prevent oscillation.
post #4364 of 4842

Bipolar Junction Transistors can have lower noise than JFETs."

 

Depends of the resistance before the opa, depends of the schema, I had had a bad experience with the remplacment of a JFET with a Bipolar.
The noise was not realy a probleme, but the continus curent was...I have changed the resistance before the opa and it's ok, sometime we have to change the schema for the opa.


The oscillation is not the only risk, and it's can be corrected if you study the theory and the datasheet (adding caps etc..).
Some opa can remplace similar opa without any risk, we can find the right match on inernet.
Generally I think it's more safe not to inverse JFET and Bipolar, but I am not electronician...
I would just explain than rolling amp can be dangerous, and the opa are rarely at there best in a schema not made for them.
But we can experiment the sound of an opa on several schema, it's always the same nature, and we can find the sound than we prefer.

 

The matrix can be safe for a lot of opa, I don't know.

post #4365 of 4842
Quote:
Originally Posted by blueangel2323 View Post

I just swapped the stock opamp for the free LM4562 sample that I received from TI. To my ears, the first thing I noticed was that the LM4562 makes the treble more delicate. Thinner, sharper, and more defined. Actually, a better word would be crisper. It sounds very crisp. The stock opamp sounded more "diffuse" and "atmosheric" in the treble. It's a bit analogous to tighter, faster bass with sharp impact, as opposed to fatter, more resonant bass with duller impact. Except... in the treble. Sorry if I'm not expressing myself very clearly; sound is hard to describe :)

 

Quote:
Originally Posted by Chris J View Post


I fully agree with your description of the LM4562.
And I know what you mean, sound is hard to describe, I'm terrible when it comes to describing sound too! biggrin.gif

Thanks!! will comment on that too once i test this setup :P 


Edited by Shini44 - 9/15/13 at 5:41pm
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