You can check out Frisky's impression on THS4032 vs many other op amps including the 49990 on the previous page. He did a pretty nice write up. I was on the same boat deciding on either THS4032/LME49990 and decided to go for the LME49990. Both are highly recommended but 49990 is slightly more...

So I was searching for the frequency response on the DTX 101 iE and I was only able to have found this: http://personalaudio.ru/raa/otchety/naushniki/beyerdynamic-dtx-101-ie/ It seems like a very beautiful close to linear frequency response with a slight peak at around 6k (lower treble) and...

I honestly think this earphone deserves much more attention, but perhaps it has to do with market availability worldwide. I trust the reviews/graphs from GoldenEars based on their rep and my own experience with headphones I own/owned. It's accurate. I'm currently in a position searching for a...

Quote:     *Edit: Impression of 49860 after ~10 hours burn in. (Burn-in Wavs + lossless recordings) *Edit#2: Day 2 (~24 hrs) *Edit#3: Day 3 (New Impression, new scores update, added Soundstage/Image new category to the review)     It's definitely lacking bass, like everyone...

Quote: Ok, so I figured I got nothing to lose by ordering 3 free samples of LME49860NA/NOPB from TI. Order was processed and sent on the same day, and next day delivery ETA from MN, US to BC, Canada, I'm impressed! Just hope I don't get hit by customs, etc, but even then it's still fair...

I was reading a thread about upgrading op amps on the Xonar STX over at DIYaudio, and a response to some of possible issues have raised some concerns:     Quote:   I was seriously about to order 3 pairs of LME49990 from a reputable source on Ebay but I'm being held back by some of...

Hi guys,   I'm looking for a stable op amp upgrade option for my STX sound card, and I'm eager to know if these LME49990 op amps are perfectly stable match with the Xonar STX for long term use. From sources I've gathered that says fast op amps like these may not work well with certain...

Quote:   The Xonar STX is worth every dollar ~$180 in the long run, so in the end I've decided to place my order on it instead of 1. my existing DGX soundcard + external amp or 2. External DAC+AMP All-in-one unit or 3. Upgrade my existing sound card with better Audio chip and DAC built...

Quote: From the sources I read here and there, the pro and premium does share the same driver and their frequency response/signature are very similar for all ohms. Quote: Those seems to be a nice match for the price you pay. I decided to go for the Asus Xonar STX as a better...

Quote: After some more cross reference searching on THS4032 and LME49990MA in the past few days, I've pretty much narrowed down to these two based on their positives to negatives feed backs in general. LME4562/720/860/797 are not an option for me.   So between LME49990 and THS4032...

Quote:     This is such a great read! thanks so very much for bringing me up to date with these info, it feels good to be back in 2013 from 2011 where I was still reading on this thread..lol. I have to say many of the points you wrote are true and the same with others I read. Thanks a...

Quote: Good to know. How did you find the soundstage of LME49990. What about mids/treble, did you find any coloration from these op amps? Would you say the LME 49990 are warm sounding op amps, warmer than stock JRCs?   Do you think these would compliment well with the already v-shaped...

Quote: Agree with your comments on the DT 990 Pro. Not sure what type of setup you have it hooked up with but it does need some serious matching amping to make it really shine to its full potential and diminishing its notorious v-shaped flaws that many other find including myself. I think...

This is a great review and I enjoyed reading it till the last word. I agree with the positives/negatives you wrote about the DT 990 Pro as I just recently got one myself. I'm using a budget Asus Xonar DGX soundcard w/ build in amp and it's clearly under-amping(up to ~150ohm) the DT 990 Pro so...