The Xonar Essence STX Q/A, tweaking, impressions thread
Jun 19, 2012 at 1:16 AM Post #3,316 of 5,694

PurpleAngel

Headphoneus Supremus
Joined
Sep 1, 2011
Posts
29,146
Likes
1,852
Location
California
Quote:
Would these work? They seem to come soldered already:
http://www.ebay.com/itm/1-Pieces-AD797BR-SOIC-to-DIP-Op-amp-replace-OPA627AU-/120757514941?pt=LH_DefaultDomain_0&hash=item1c1db572bd
Judging by "SOIC to DIP" in the title.
I went ahead and bought 3 of these LME49860NA, I hope I got the right thing:
http://www.mouser.com/Search/ProductDetail.aspx?R=LME49860NA/NOPBvirtualkey99990000virtualkey926-LME49860NA/NOPB

The LME49860NAs are correct.
 
The AD797BRs you listed are single op-amps per adapter, you need two op-amps per adapter.
This is who I bought my pre-soldered AD797BRs from.
http://www.ebay.com/itm/mod-1x-AD797BR-Dual-to-Mono-Op-amp-module-/350553500538?pt=LH_DefaultDomain_0&hash=item519e9deb7a
 
Jun 19, 2012 at 1:21 AM Post #3,317 of 5,694

theShaz

New Head-Fier
Joined
Jun 18, 2012
Posts
41
Likes
10
Quote:
The LME49860NAs are correct.
 
The AD797BRs you listed are single op-amps per adapter, you need two op-amps per adapter.
This is who I bought my pre-soldered AD797BRs from.
http://www.ebay.com/itm/mod-1x-AD797BR-Dual-to-Mono-Op-amp-module-/350553500538?pt=LH_DefaultDomain_0&hash=item519e9deb7a


You sir are a life saver. Thank you very much. +rep
 
While we're at the OPAMP topic, the H6 board comes with a ton of OPAMPS.. look at this thing:
 
XonarH6.jpg

 
How many do I need to buy to satisfy all 5.1 6 channels?
 
PS. This is Xonar ST + H6 combo I'm reffering to here. Not to confuse it with the STX card.
 
Jun 19, 2012 at 2:24 AM Post #3,318 of 5,694

PurpleAngel

Headphoneus Supremus
Joined
Sep 1, 2011
Posts
29,146
Likes
1,852
Location
California
Quote:
You sir are a life saver. Thank you very much. +rep
 
While we're at the OPAMP topic, the H6 board comes with a ton of OPAMPS.. look at this thing:
 
XonarH6.jpg

 
How many do I need to buy to satisfy all 5.1 6 channels?
 
PS. This is Xonar ST + H6 combo I'm reffering to here. Not to confuse it with the STX card.

I believe the H6 is six channel and uses the op-amps on the ST for the other two channels, total 8 channels
total of 12 op-amps, so I'm guessing 9 op-amps to cover 6 channels, but which 9??
I'm guessing the ST card still covers the front 2 channels and the H6 does 2-side, 2-rear, 1-center, 1-subwoofer.
I'm going to "guess" the black and red cover center & sub. on the H6
 
Jun 19, 2012 at 3:36 AM Post #3,319 of 5,694

WiR3D

We intend to hurt him...quite a bit. very_evil_smiley.gif
Joined
Feb 2, 2012
Posts
2,319
Likes
97
Jun 19, 2012 at 10:43 AM Post #3,320 of 5,694

theShaz

New Head-Fier
Joined
Jun 18, 2012
Posts
41
Likes
10
Quote:
I believe the H6 is six channel and uses the op-amps on the ST for the other two channels, total 8 channels
total of 12 op-amps, so I'm guessing 9 op-amps to cover 6 channels, but which 9??
I'm guessing the ST card still covers the front 2 channels and the H6 does 2-side, 2-rear, 1-center, 1-subwoofer.
I'm going to "guess" the black and red cover center & sub. on the H6

NyrHR.jpg

This is how they're laid out.
 
Jun 19, 2012 at 10:49 AM Post #3,321 of 5,694

PurpleAngel

Headphoneus Supremus
Joined
Sep 1, 2011
Posts
29,146
Likes
1,852
Location
California
Quote:
NyrHR.jpg

This is how they're laid out.

Oops, I was wrong about the center/sub jacks, good thing there are Head-Fiers better informed then me.
 
Jun 19, 2012 at 11:43 AM Post #3,323 of 5,694

WiR3D

We intend to hurt him...quite a bit. very_evil_smiley.gif
Joined
Feb 2, 2012
Posts
2,319
Likes
97
Quote:
What do you make of the OPAMPS under the red circles vs. the ones under the green circles?
 
This is hella confusing! >.<

Green circles = Voltage/Current conversion opamps (one for each channel)
red circles = Buffer opamps. (one for both channels)
 
Jun 19, 2012 at 12:31 PM Post #3,324 of 5,694

theShaz

New Head-Fier
Joined
Jun 18, 2012
Posts
41
Likes
10
Quote:
Green circles = Voltage/Current conversion opamps (one for each channel)
red circles = Buffer opamps. (one for both channels)

 
So I don't need to mess with the Buffer opamps, just the the ones under the green circles.
 
That should be a total of 6 opamps, one per channel. (ST (Front-R, Front-L), H6 (Center, Sub, Rear-R and Rear-L).
 
Am I correct in that assumption?
 
Jun 19, 2012 at 1:00 PM Post #3,325 of 5,694

WiR3D

We intend to hurt him...quite a bit. very_evil_smiley.gif
Joined
Feb 2, 2012
Posts
2,319
Likes
97
Quote:
 
So I don't need to mess with the Buffer opamps, just the the ones under the green circles.
 
That should be a total of 6 opamps, one per channel. (ST (Front-R, Front-L), H6 (Center, Sub, Rear-R and Rear-L).
 
Am I correct in that assumption?

nope. Mess with them all. it allows you to have different combinations. 
THS4032 is a nice smooth and detailed opamp, to me its the best compromise.
AD797 is the most detailed, but its unstable. I don't care TBH it just means it may eventually pack up (the board will be fine) just dont do the Resistor mod on it to stabilize it, that will break the board.
 
OPA827 is boring and sluggish. 
 
I have a feeling the 2xLME49710HA will be a good buffer. but its not exactly cheap.
 
 
 
from all my reading I have this list of opamps to AVOID!
 
  1. OPA2134P <- massive downgrade from OPA2132
  2. OPA2107 -harsh, also quoted as polite?
  3. OPA637- TO-99, balls expensive and difficult to place properly
  4. NE5532 - ****
  5. LME49720HA - has screwed up mids, good bass though
  6. LT1028 or LT1028CS8 - aggressive treble
  7. LT1358 - conflicting reviews, bad bad match in I/V for STX, but good in others
  8. HDAM OPA Sun v2 - bright
  9. HDAM OPA Moon - blurry aka too tubey
  10. LT1469 - highs are too much, mids resonate, but ultra detailed, possibly harsh
 
These are some I wanted to try:
  1. LME49990MA -Another good one, not full of flaws like the LME497xxx or LME498xxx series
  2. AD8599AR - supposed to be a non-picky more stable and less harsh version of the AD797
  3. OPA1611AID -Reccomended by TI, also non-picky.
  4. OPA2132PA -for buffer slot
 
And some I still havent researched (sound wise they should be good, but not so sure about stability wise.)
  1. LT1122CS8
  2. LT1208CS8
  3. OPA132UA
 

 
Jun 19, 2012 at 3:36 PM Post #3,326 of 5,694

theShaz

New Head-Fier
Joined
Jun 18, 2012
Posts
41
Likes
10
Thanks WiR3D. at least that gives me somewhere to start. I'm going to try and buy a few samples of the following:
 
LME49990MA
AD8599AR
OPA1611AID
OPA2132PA
OPA132UA
LT1122CS8
LT1208CS8
 
Only problem is, I don't know which ones I'm going to need an adapter for and which ones I won't. It would also be great if someone can point me to a place where I can purchase the adapter and make my own OpAmp combos. (I have a soldering stick)
 
Jun 19, 2012 at 4:02 PM Post #3,327 of 5,694

deathzero34

New Head-Fier
Joined
Mar 26, 2011
Posts
49
Likes
10
Well the pin out need to be similar for the circuit to work properly. So you would need to check the new OPAMP vs the old OPAMP to see if the pin are the same thing. If yes no modification required, if no ....
 
Although most Opamp packaging usually sport the same pinout for simplicity sake for engeneer.
 
Jun 20, 2012 at 2:42 AM Post #3,328 of 5,694

WiR3D

We intend to hurt him...quite a bit. very_evil_smiley.gif
Joined
Feb 2, 2012
Posts
2,319
Likes
97
Quote:
Thanks WiR3D. at least that gives me somewhere to start. I'm going to try and buy a few samples of the following:
 
LME49990MA
AD8599AR
OPA1611AID
OPA2132PA
OPA132UA
LT1122CS8
LT1208CS8
 
Only problem is, I don't know which ones I'm going to need an adapter for and which ones I won't. It would also be great if someone can point me to a place where I can purchase the adapter and make my own OpAmp combos. (I have a soldering stick)

Well they all need to be dual. and all need to be dip8. Ebay is your friend. goodtronic is willing to get you stuff they dont have listed and build all the adapter for you, and at a good price. The problem being there build quality is only ok. But for experimenting its fine in my books. and to note the AD8599 is expensive!
 
I have/would just contact goodtronic and get a quote for 2x each of those in dip8 Dual format, then just add one item to the cart, and request total with the quote they gave you as a comment.
 
Boom.
 
And I do recommend getting the THS4032 while your at it, it is a good one.
 
Jun 20, 2012 at 9:05 AM Post #3,329 of 5,694

theShaz

New Head-Fier
Joined
Jun 18, 2012
Posts
41
Likes
10
Quote:
I have/would just contact goodtronic and get a quote for 2x each of those in dip8 Dual format, then just add one item to the cart, and request total with the quote they gave you as a comment.
 
Boom.
 
And I do recommend getting the THS4032 while your at it, it is a good one.

Just sent him/her/it (lol) an Ebay Msg with the full list including the THS4032, let's see what he comes back with.
 
Thanks for reminding me about the THS4032, that needed to go on my master list.
 
Jun 20, 2012 at 9:46 AM Post #3,330 of 5,694

WiR3D

We intend to hurt him...quite a bit. very_evil_smiley.gif
Joined
Feb 2, 2012
Posts
2,319
Likes
97
Quote:
Just sent him/her/it (lol) an Ebay Msg with the full list including the THS4032, let's see what he comes back with.
 
Thanks for reminding me about the THS4032, that needed to go on my master list.

Keep us posted, that was my second master list. I haven't bought all of those yet, but i want to.
 
My previous list was:
  1. AD797BR
  2. LT1057ANC
  3. OPA827ANC8
  4. 2xLME49710HA
  5. THS4032
  6. OPA2134 (I made a mistake when I ordered it, I meant to Order the OPA2132, but it never arrived anyway lol.)
 
 
btw you should really get a set headphones. AKG K242HD or AKG K240 studio / MKII really show the differences in the opamps clearly, they also scale well with good equipment, and are dirt cheap nowadays. 
 

Users who are viewing this thread

Top