Originally Posted by earfanatic 

I tried some lme49990 as buffer and I liked it better than the LT1028. Very little change though.

that's because you didn't try the AC grade of LT1028 IIRC

Quote:

Originally Posted by leeperry 

that's because you didn't try the AC grade of LT1028 IIRC

 

Yep, I forgot to mention I had only the LT1028CS8 version. :-)

Have the 2x2x AD797BR (I/V)and 2x LT1028ACN (buffer) in the advanced HD2 version + the 4 470 ohm (not 460) resistors mod.

like the sound of it :clear and direct.

But this opamp 1028+resistors causes a loud PC power on and off 'plok' sound..:(

Must be the sensitive nature of these opamp (1028 ) DC out power up/off?

No hard plok with another opamp as buffer like lme49990? > eBay ordering...

Update nov 9 : received The DUAL SOIC LME49990 DIP8 ADAPTER for the buffer> the 1028ACN  and resistors out.

No loud PC Power on/off plok anymore just the soft driver clicks when windows boots.

Sound ; clear, bright and detailed mids/high.

Like the sound better than the 3x Burson version which I was selling: a bit to dark for me , just a matter of taste

update nov27: back to LT1028ACN, no resistors mod . seems to work, opamps running cool, so far I can check with the fingers..

like the LT1028ACN better than the LME49990; not so bright, more bass .

The LME 49990 did I put in my Little Dot 1+  Head amp(+DT990) a better place for this bright but nice detailed opamp.

(update :I did also a LT1028 (CS8)in my Little dot >also here deeper bass more 'organic' mids&high compared to the LME49990.

Now is the sound balanced: deep bass, detailed, clear mid and high,  not overbright.

So for me(and Leeperry) the  AD797BR and LT1028ACN combo is still unbeatable

I will now try to solve the  power on/off plops with decoupling caps, output resitors and coils.

update dec.4:specsheet:

I did use a 47 pF over-compensation cap.power on/off plops seems less, less overshoot?.. tweaking on

Dear lovers of great sounding music!

I was always a freak of highest quality sound, but did come to the truth after many years by purchasing HD2 Advance DE soundcard (at least I hope so:))

To be most specific and less bothering for community just a few  questions:

1. Which is best for W7X64: WDM or ASIO? I need the card exclusivelty for music.

2. Based on this thread summary (excluded any experiments resulting in possible pops and clicks) going to settle at  LT1364x2+LT1361 or Lt1364x2+LM4562NA. Do we have any winners?

Thank you for support

Some people tell that sound of HD2 more harmony than the ASUS Essence...is it possible? 

Some other site that had the old guy judging sound by his ear rather than specs which is more my style, had some 'old cans' on the output. I found them, you guessed it, Ebay from China ($27 FS)  OPA 111BM already mounted on an adapter.

I am still running the adapted AD797BR but replaced the adapted OPA627AU output with these adapted cans, no other mods.

The cans seem to not filter out certain frequencies where the more sophisticated OP-AMPs do. Instead of a type of muddled bass, I hear low/deep musical tones off the, drums and bass guitar. Clarity is as good or better. Staging is slightly different but certainly not missing.  I'd say it favors the mid to lower ranges, only slightly missing the highs. Voice range is excellent. Seems to reproduce older recorded music well or at least makes it sound better.

I gave up on flashing my Advanced bios chip since VIA came out with Driver Version 5.12.3656 with Program Version 6.10 that includes Q-Sound settings with GUI smoothing/3D/QX(normalize)/sizzle/rumble and a Equalizer panel that I never use.

Smoothing, 3D, QX, sizzle slid closer to the far right are my settings.

Aside: Took awhile to reread that I needed the jumper in the 'Off' position for flashing back to the original Advanced bios. It lives well with Win7 using the above OP-AMPs and software settings. Have some Sennheiser HD 280 Pro phones, never use them. Still in 2.1 mode with Klipsch Ultra 5.1 sub with circa 2002 Klipsch bookshelf reference RB35RB75 speakers (6.5" mid, 1" tweet sits in a 5" horn, 52hz-20khz 94db 100watt, rear ported). These speakers actually drown out the sub for a prefect blend between the three.

Have LT 1028ACN8 adapted waiting for the next sound check. I'll see if $17 to China was wasted or not.

LME49990 with hd2 advance?

Anybody used this?

A bit too expensive though (double on DIP adapter) US$ 20 on ebay... 

dear tagi< just read my above post......

http://www.head-fi.org/t/322497/audiotrak-prodigy-hd2-opamp-configurations-list/435#post_7861963

Hello all,

i am new user of HD2, Am i should flash my HD2? if yes, why?

Thanks