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Hotrodding the X-Fi: A Layman's Guide (No 56k) - Page 7

post #91 of 2184
Quote:
Originally Posted by sonance View Post
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?
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
post #92 of 2184
Thread Starter 
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.
post #93 of 2184

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?

post #94 of 2184
Thread Starter 
Quote:
Originally Posted by Liver View Post
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?

you want to short the 16 capacitors closest to each of the 4 opamps.
post #95 of 2184
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?
post #96 of 2184
Thread Starter 
Quote:
Originally Posted by Soymilk View Post
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?
it will still suffer, because the problem is in the digital domain. the best way to fix it is to turn it off =).
post #97 of 2184
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.
post #98 of 2184
cotdt can you post a pic of the completed card with all opamps changed and the recap.
post #99 of 2184
Thread Starter 
Quote:
Originally Posted by mobayrasta View Post
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!
post #100 of 2184

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?
post #101 of 2184
Thread Starter 
Quote:
Originally Posted by bDerek View Post
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?
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?
post #102 of 2184
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.
post #103 of 2184
Thread Starter 
Quote:
Originally Posted by ]|[ GorE View Post
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.
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.
post #104 of 2184
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?
post #105 of 2184
Quote:
Originally Posted by DSlayerZX View Post
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.
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