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| Computer Audio Discussion of computers as source components, sound cards, USB DACs, media servers, etc. |
03-16-2007, 06:05 PM
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Head-Fi'er
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Join Date: Sep 2006
Posts: 64
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Quote:
Originally Posted by sonance
How hard would it be to swap out the DAC chips on the X-Fi Xtreme Music?
How good are the DACs and OpAmps on the Elite Pro by comparison?
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i think someone has said that the pin outs on the 2 dacs are not identical, so you cant replace the one on the xtreme music with the one on the elite pro.
And i guess i better risk the cap shorting/ removal. I get the popping problem on the breakout box 
__________________
Foobar > Partly Modded X-fi > HD595
.flac .mp3 320k
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03-17-2007, 06:59 PM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: San Diego/Los Angeles
Posts: 3,189
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the x-fi elite pro has a better DAC chip and would sound fuller and weightier, but the analog stage is what makes the greatest difference in sound.
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03-17-2007, 11:20 PM
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100+ Head-Fi'er
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Join Date: Apr 2004
Posts: 455
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what caps to short on the XFi Elite?
From what I gather I have labeled this pic
The OpAmp to replaced, and the three surrounds below it. The Power Filter Cap, and the CS4398s have been labeled. But what capacitors to short?
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03-17-2007, 11:40 PM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: San Diego/Los Angeles
Posts: 3,189
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Quote:
Originally Posted by Liver
From what I gather I have labeled this pic
The OpAmp to replaced, and the three surrounds below it. The Power Filter Cap, and the CS4398s have been labeled. But what capacitors to short?
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you want to short the 16 capacitors closest to each of the 4 opamps.
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03-18-2007, 12:54 AM
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100+ Head-Fi'er
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Join Date: Jan 2006
Posts: 344
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i have another question!
i've been reading around, and i saw that for the x-fi xtrememusic, while cmss3d is enabled, the SQ takes a noticeable hit. does this mod fix that, or does SQ still suffer while it's on?
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03-18-2007, 01:02 AM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: San Diego/Los Angeles
Posts: 3,189
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Quote:
Originally Posted by Soymilk
i have another question!
i've been reading around, and i saw that for the x-fi xtrememusic, while cmss3d is enabled, the SQ takes a noticeable hit. does this mod fix that, or does SQ still suffer while it's on?
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it will still suffer, because the problem is in the digital domain. the best way to fix it is to turn it off =).
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03-18-2007, 03:59 AM
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100+ Head-Fi'er
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Join Date: Jun 2006
Location: Durham, NC
Posts: 489
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never got a reply from jude about the possibility of a group buy. If anyone is interested in splitting some ERS paper, let me know. I'm ordering a sheet from parts connection on monday. I'll post pics of my elite pro breakout very soon.
__________________
Team AKG
Team College
Dorm Rig: X-Fi Elite Pro(modded) bitperfect out to--> DIY Maxed Pimeta w/ TREAD/ SOHA-->AKG K501(recabled)
Onkyo c390(thanks asr!)/Modded Sony SCD-595-->5687 Tube Preamp --> Firstwatt F2 clone-->Tekton Design 4.1's
Portable: AlienDAC--> Cmoy-->ETY ER4-S
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03-18-2007, 04:13 AM
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100+ Head-Fi'er
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Join Date: Jan 2007
Location: Maryland USA-All over Jamaica whenever possible.
Posts: 191
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cotdt can you post a pic of the completed card with all opamps changed and the recap. 
__________________
Headphones-Ultrasone 2500's
AMP- SOHA dual OPA627-BUF634 output stage
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03-18-2007, 04:30 AM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: San Diego/Los Angeles
Posts: 3,189
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Quote:
Originally Posted by mobayrasta
cotdt can you post a pic of the completed card with all opamps changed and the recap. |
i put ERS paper on them so you can't see anything anymore! it's no longer naked!
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03-18-2007, 04:37 AM
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Junior Head-Fi'er
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Join Date: Mar 2007
Posts: 1
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X-Fi Output Diagram
Attached in the pdf is the output circuit that I have traced on an X-Fi Platinum. I cannot see any of the 22uF electrolytic caps in the ouput at all but have traced some connected to +5v and -5v rails. Replacing the op amps are a great idea but could more be done replacing the transistors Q2,Q3,Q4,Q5 that are all marked J1X on the front outputs and on the other outputs a different set of transistors are used marked O2NR. Anyone know what who makes the J1X and O2NR transistors?
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03-18-2007, 04:54 AM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: San Diego/Los Angeles
Posts: 3,189
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Quote:
Originally Posted by bDerek
Attached in the pdf is the output circuit that I have traced on an X-Fi Platinum. I cannot see any of the 22uF electrolytic caps in the ouput at all but have traced some connected to +5v and -5v rails. Replacing the op amps are a great idea but could more be done replacing the transistors Q2,Q3,Q4,Q5 that are all marked J1X on the front outputs and on the other outputs a different set of transistors are used marked O2NR. Anyone know what who makes the J1X and O2NR transistors?
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amazing work! you sure entered head-fi with a bang. on the newer X-Fi cards, the transistors are J1(infinity) instead of J1X and O2N- instead of 02NR. any idea what they can be replaced with?
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03-18-2007, 07:05 AM
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![]|[ GorE's Avatar](http://www.head-fi.org/forums/avatars/-gore-10421.gif?dateline=1165167778) |
500+ Head-Fi'er
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Join Date: Mar 2004
Location: Sharjah , United Arab Emirates.
Posts: 788
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Those capacitors dont block DC ! They are connected to the +5 and -5V lines and are meant as current reservoirs. The reason there are 4 for each opamp is to keep the capacitors impedance low . I would add a higher valued cap in parallel to the existing caps,not short them.
And,instead of doing such a hokey mod,i would look up the datasheets of the dac and add the capacitors Creative has left out.
__________________
Team EQ
Hardmodded Audigy Value 24bit (AD8620 opamps and improved power filtering) -> 48Khz Resampling ->Winamp ->diy maxed out cmoy ->[EQ'ed]Philips HP805 . Portable : Zen Neeon 6GB - >[EQ'd]Koss UR40.
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03-18-2007, 08:06 AM
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Headphoneus Supremus
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Join Date: Aug 2005
Location: San Diego/Los Angeles
Posts: 3,189
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Quote:
Originally Posted by ]|[ GorE
Those capacitors dont block DC ! They are connected to the +5 and -5V lines and are meant as current reservoirs. The reason there are 4 for each opamp is to keep the capacitors impedance low . I would add a higher valued cap in parallel to the existing caps,not short them.
And,instead of doing such a hokey mod,i would look up the datasheets of the dac and add the capacitors Creative has left out.
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hmmmz... you sure? i'll trace the board and see...
Edit: Updated about the DC-coupling caps. I traced the opamp outputs and the 22uF are not part of the DC-coupling after all. Apparently, the X-Fi does things different from other sound cards. I still prefer the sound with those 22uF caps shorted though.
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03-19-2007, 12:48 AM
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500+ Head-Fi'er
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Join Date: Oct 2006
Posts: 677
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hmmm interesting, the from what you guys are saying, is it better not the short them out, since they might cause damage to the chips? 
__________________
as of 9-14-2008
Headphones: W5000
Amplification: Stello HP100
Source: Foobar2000 ->Juli@
Portable Audio: Sony NW-A3000 with E4C (currently broken)
Used to own: HD650 (original, Carda, Equinox), HD595, Headfive
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03-19-2007, 11:13 AM
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500+ Head-Fi'er
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Join Date: Mar 2004
Location: Sharjah , United Arab Emirates.
Posts: 788
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Quote:
Originally Posted by DSlayerZX
hmmm interesting, the from what you guys are saying, is it better not the short them out, since they might cause damage to the chips? |
No damage will be caused to any chips;we aren't sure what is the exact use of those 22uF caps . If they are reservoir/decoupling caps for the V+ and V- of the opamps and shorting them seems to improve the sound(according to the OP),then perhaps the Jamicons should be replaced with lower ESR caps.
__________________
Team EQ
Hardmodded Audigy Value 24bit (AD8620 opamps and improved power filtering) -> 48Khz Resampling ->Winamp ->diy maxed out cmoy ->[EQ'ed]Philips HP805 . Portable : Zen Neeon 6GB - >[EQ'd]Koss UR40.
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