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Hotrodding the X-Fi: A Layman's Guide (No 56k) - Page 64

post #946 of 2194
anyone compared the modded xfi to the X-Meridian?
post #947 of 2194
Quote:
Originally Posted by kamal007 View Post
anyone compared the modded xfi to the X-Meridian?
I like x-meridian little better.
post #948 of 2194
alright, finally finished this mod tonight. changed out the input and headphone opamp for lm4562. wow! i really like how much more engaging the soundfield is. haven't had a chance to fully evaluate yet but the bass is much cleaner and more defined and the midrange has greater seperation and a real sense of detail. screwed up the first card learning to do this. but i think it was worth it. i learned a bit about soldering and electronics. and now i have a freakin awesome sounding soundcard. thanks codt and all who have participated in this thread!
post #949 of 2194
ahhh.... i'm having a hard time looking for ad8599..... it's out of stock @ analogdevices.

i think i just have to be satisfied with LM4562MA
post #950 of 2194
just wondering, will this mod be kinda useless if we use an external headphone amplifier?
post #951 of 2194
Thread Starter 
Quote:
Originally Posted by kamal007 View Post
just wondering, will this mod be kinda useless if we use an external headphone amplifier?
no, this mod is a mod for the DAC, while the amp comes after the DAC. in fact, i would recommend an external amp for anything beyond IEMs. and even IEMs can benefit from amping.
post #952 of 2194
COTDT, I seen a guy on another forum using a Passive out on a X-Meridian and thought it would work for the X-fi aswell. I don't know if you know what it is or not so I will explain. A Passive output taps the circuit after the DAC and before the Opamp so it bypasses the opamps and caps actually th whole output section. There is a small circuit that needs to be built but I guess it gives great results if you are into trying it out. I think he only taps the front L & R for headphones or stereo output. 5.1 would need a bit more work.
post #953 of 2194
just wondering....
after all this mod....
which mp3 player did u guys use to play your mp3s?

i use my fully customized foobar.
post #954 of 2194
flac + asio on foobar
post #955 of 2194
Thread Starter 
Quote:
Originally Posted by ROBSCIX View Post
COTDT, I seen a guy on another forum using a Passive out on a X-Meridian and thought it would work for the X-fi aswell. I don't know if you know what it is or not so I will explain. A Passive output taps the circuit after the DAC and before the Opamp so it bypasses the opamps and caps actually th whole output section. There is a small circuit that needs to be built but I guess it gives great results if you are into trying it out. I think he only taps the front L & R for headphones or stereo output. 5.1 would need a bit more work.
you mean just a low-pass filter? i've tried that with my DAC and couldn't get enough volume out of it...
post #956 of 2194
Yeah,the opamps up the voltage of the audio signal to somewhere near the standard,2 Vrms.
post #957 of 2194
@COTDT, The mod is called a passive out. It uses a small coupling circuit to tap into the analog signal PRIOR to the opamp. Theory being the output section does more to hurt the signal the enhance it. The guy did it with a Blue gears 8788 card but the idea is generic so it could be done to any sound card. The owner states a passive output sounds better then any opamps. I am only mentioning it to you I have not tried it and I am not even sure I am a advocate of the mod or not. My education tends to instill some reservations about this modification...
post #958 of 2194
Thread Starter 
Quote:
Originally Posted by ROBSCIX View Post
@COTDT, The mod is called a passive out. It uses a small coupling circuit to tap into the analog signal PRIOR to the opamp. Theory being the output section does more to hurt the signal the enhance it. The guy did it with a Blue gears 8788 card but the idea is generic so it could be done to any sound card. The owner states a passive output sounds better then any opamps. I am only mentioning it to you I have not tried it and I am not even sure I am a advocate of the mod or not. My education tends to instill some reservations about this modification...
the way i understand it, a passive out uses passive components to filter the output of the DAC chip and bypasses all the opamps. is this what he did? with a high enough input impedance on the amp, it should work and is worth trying out.
post #959 of 2194
ATTENTION to anyone who is thinking of doing the L4562 mod: The IC is way smaller then you would think. I was expecting 555 timer size (not MDIP obviously) but holy *#&$#. When I got it in the mail I almost crapped my pants thinking of soldering this baby in. After the dust had settled I was able to install it with no problems (braid + silver solder + micro snips + micro tweezers + 45w iron /w micro tip). Keep in mind if you aren't 100% confident in your skills, please do not attempt.

post #960 of 2194
Quote:
Originally Posted by cotdt View Post
the way i understand it, a passive out uses passive components to filter the output of the DAC chip and bypasses all the opamps. is this what he did? with a high enough input impedance on the amp, it should work and is worth trying out.
That is what he did. Here is a link to the thread where it is discussed. There is a embedded link to pics aswell as a small circuit design. The circuit is just a decoupling circuit bu the look of it a few resistors and some caps.
http://www.avsforum.com/avs-vb/showthread.php?t=867750

You think the output of this circuit would give better sound then a output section on a card using opamps such as LM4562's?
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