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Auzentech X-fi Bravura 7.1 Sneak Peek - Page 9

post #121 of 445
Thread Starter 
The Dual LME49710HA is also a great amplifier for that circuit.
post #122 of 445
Where did this thread go ?

Finally got some OPA627 from eBay/China. Have to give a nod to eBay seller "tube_buyer". Prompt delivery (4 working days to UK), excellent communication and everything is superbly packaged. Envelope is customs declared as gift and sealed (if tampered). You even have a nice and sturdy box for your precious opamps:

/

I really appreciate spacious design around the opamps. Even dual DIP8 are snug nicely



Tools for a trade:



My trustworthy AudioTrak. Challenged by Bravura.


My hart sank when I installed the opamps on Bravura and didn't have anything on front analog output channels. Then, I realised that my output was muted in ASIO mixer. Phew ... Anyhow, new opamps are nicely warming up. Have to be patient a bit, but I think that warmth, spacious soundscape and less pronounced shrill are emerging. It's a good sign.
post #123 of 445
Thread Starter 
Nice stuff. You can use that similar adapter on the Center/sub channel and split off the channels. This way you can use different opamps for the center and sub.

Keep us posted. I was listening to this card with a OPA627AU snapped in for a few days, sounds quite good IMO.
post #124 of 445
Quote:
Originally Posted by ROBSCIX View Post
Nice stuff. You can use that similar adapter on the Center/sub channel and split off the channels. This way you can use different opamps for the center and sub.
Yes. I figured that out when I was sourcing the opamp and adapter caught my eye. Only question remains which single channel opamp is suitable for sub (bass) channel in general. I guess something with rather extensive, non-muffled and firm low end. Then, for center channel something bright with nice vocal texture and positioning. In case that I don't split channels, dual opamp is an option too. Any suggestion is more then welcomed. Also, how should I now which socket is for what, when spitting the channels ?

Quote:
Originally Posted by ROBSCIX View Post
Keep us posted. I was listening to this card with a OPA627AU snapped in for a few days, sounds quite good IMO.
It's immense improvement over stock. I'm enjoying it very very much. This chip is really in the class of it's own and harmonious with the Bravura itself. It's so detailed, clean, natural ... musical in most simplistic sense.

I *think* that Audiotrak can go eBay ... but I would rather not make any sudden conclusions at this stage
post #125 of 445
Thread Starter 
Quote:
Originally Posted by Incognito73 View Post
Yes. I figured that out when I was sourcing the opamp and adapter caught my eye. Only question remains which single channel opamp is suitable for sub (bass) channel in general. I guess something with rather extensive, non-muffled and firm low end. Then, for center channel something bright with nice vocal texture and positioning. In case that I don't split channels, dual opamp is an option too. Any suggestion is more then welcomed. Also, how should I now which socket is for what, when spitting the channels ?
There are a few good ones for bass.
If you have the dual channel adapter installed that you posted, with the card on a table with the I/O to the left hand side the opamp socket on the left is for the center and the opamps on the right is for the subwoofer.
Let me check my notes for some suggestions. I usually go with the OPA2227 for bass channel and there is a single channel version also. I use the dual channel version for my sub channel. -using a special adapter.
Quote:
Originally Posted by Incognito73 View Post
It's immense improvement over stock. I'm enjoying it very very much. This chip is really in the class of it's own and harmonious with the Bravura itself. It's so detailed, clean, natural ... musical in most simplistic sense.

I *think* that Audiotrak can go eBay ... but I would rather not make any sudden conclusions at this stage
Yes, the opa627 is a good match for the DAC's on this card.
The OPA827's have been getting great feedback from designers and audio nuts. I want to check out the card with this unit and possibly a discrete unit.
Enjoy.
post #126 of 445
Ta for the valuable info! Much appreciated.

According to Farnell UK ... unless it's different nomenclature, can't see the single amp version. Then there are OPA2227PA and OPA2227P variants. Speaking of dual channel adapter, yes, one can use dual channel opamp and convert any available analog stereo channel to dedicated sub out, then use stereo->mono adapter cable for the sub, if needed. Maybe you are talking about something completely different.

Solely based on naming, TI OPA827 does "sound" like BB OPA627 successor, no? I mean, BB OPA627 price + reliable sourcing is an "issue" more often then usual. It's good to have alternative option.
post #127 of 445
anyone could share the PDF manual please? I can't find it on their website, and the only explanations I've found so far for the different modes were in broken english

anyone tried them at all on the HP out?

and if ASIO4ALL works, I guess that means that KS works too

I've asked their tech support, but they seem to be brain damaged...they never seem to understand anything of what I'm saying
post #128 of 445
Thread Starter 
Quote:
Originally Posted by Incognito73 View Post
Ta for the valuable info! Much appreciated.

According to Farnell UK ... unless it's different nomenclature, can't see the single amp version. Then there are OPA2227PA and OPA2227P variants. Speaking of dual channel adapter, yes, one can use dual channel opamp and convert any available analog stereo channel to dedicated sub out, then use stereo->mono adapter cable for the sub, if needed. Maybe you are talking about something completely different.

Solely based on naming, TI OPA827 does "sound" like BB OPA627 successor, no? I mean, BB OPA627 price + reliable sourcing is an "issue" more often then usual. It's good to have alternative option.
I am unsure right off the top of my head what the single version is as I use a dual channel version for that task. (modified adapter). I am thinking 127..177 but that might not be right. I will check my listing., you may have to go with a dual channel version if you like that unit.

I am talking about something different the what you wrote. OK, on the center/sub channel the socket accepts a dual channel opamp. One channel is used for the center and one channel is used for the sub. You can use the adapters you have to split it to two single channel opamps. I have one similar to this but I modified it so it accepts a DUAL channel opamp for the subwoofer.
The OPA827 are pretty nice but you already have the 627 in there.
post #129 of 445
also, considering that AD797 is officially supported...maybe LT1028 would work too? their tech support has no idea wth I'm talking about when I talk about "unity gain stability"
post #130 of 445
Thread Starter 
@Incognito73, I checked my notes. The single channel version is the OPA227, I have always used the opa2227 for subchannels and have the 227 also. Many agree that the OPA2227 has a very good bass signature. It is worth a try for you I would say.
Now, you just have to figure out which one to use for the center channel. I am using a LME49710NA for the center they offer great clarity and detail. Mixes great with the dual LME49710HA that I am currently using in the front channels.
Hope this helps.
post #131 of 445
Quote:
Originally Posted by leeperry View Post
anyone could share the PDF manual please? I can't find it on their website, and the only explanations I've found so far for the different modes were in broken english
Nothing much in the manual too. Screen grab from their web site, posted few pages back, is the most "helpful" atm. I did tried to switch the I/O modes (speaker out) ... output level does change quite a bit. Unfortunately, didn't have time to audition peculiarities. It's difficult to audition the I/O change for speakers as I have to be in front of the PC (and behind my speakers, so no listening position). Need to use headphones for both analog ports (headphone and speaker out).

It's good that you can adapt the output according to your gear ... although I would prefer software mode for this (instead of hardware switches). On the other hand, that would probably increase the product price even more.

Quote:
Originally Posted by leeperry View Post
and if ASIO4ALL works, I guess that means that KS works too
ASIO4ALL works fine. I need ASIO to route everything to ASIO mixer (VST host) for further processing (use other analog/stereo outputs for other things, WDM routing, sub channel separation, eventually couple of DSP filters mainly for video/movies ... etc). Even S/PDIF loopback "jumper" is handy for audio routing from WDM to ASIO, for applications without direct support for ASIO.

Quote:
Originally Posted by leeperry View Post
I've asked their tech support, but they seem to be brain damaged...they never seem to understand anything of what I'm saying
Quote:
Originally Posted by leeperry View Post
also, considering that AD797 is officially supported...maybe LT1028 would work too? their tech support has no idea wth I'm talking about when I talk about "unity gain stability
This is a joke, right ? I can't believe that you are pestering poor 1st line support people with such questions,let alone opamp unity gain. LOL Man ... this is a good one.
post #132 of 445
oh...so the different "modes" will have to remain a mystery for now

2 friends of mine have ordered it anyway, I count of them to try them all!

well, tech support usually have several levels...I'd expect someone from level 2/3 to answer my questions, they put swappable opamps, it's a good guess ppl will put those sockets to good use...when I was asking HT.Omega about technical stuff, they were always coming back to me w/ technical answers.

anyway I like the separate ground, it's prolly like on the STX...a dead black background is truly fantastic
post #133 of 445
Quote:
Originally Posted by ROBSCIX View Post
... You can use the adapters you have to split it to two single channel opamps. I have one similar to this but I modified it so it accepts a DUAL channel opamp for the subwoofer.
Got it now!

Quote:
Originally Posted by ROBSCIX View Post
@Incognito73, I checked my notes. The single channel version is the OPA227, I have always used the opa2227 for subchannels and have the 227 also. Many agree that the OPA2227 has a very good bass signature. It is worth a try for you I would say.
... found it. There is also non-A version (this is PA) and it's just different in DC specs. Probably not very useful for audio (and it's more expensive too).

Definitely worth a try. Thanks for the follow up!

Quote:
Originally Posted by ROBSCIX View Post
Now, you just have to figure out which one to use for the center channel. I am using a LME49710NA for the center they offer great clarity and detail. Mixes great with the dual LME49710HA that I am currently using in the front channels.
Hope this helps.
Yeah, LM is logical choice. For now, I will pop in 2XOPA227 on the adapter until I figure out the center channel.

By the way, I may borrow couple of AD797ANZ (DIP8) for the weekend. Not sure how that will pan out, but would be interesting to audition them nevertheless. I may move the OPA627 to headphone section, use AD797 for front speakers, OPA227 for sub. Will see ...
post #134 of 445
Thread Starter 
Quote:
Originally Posted by Incognito73 View Post
Got it now!


... found it. There is also non-A version (this is PA) and it's just different in DC specs. Probably not very useful for audio (and it's more expensive too).

Definitely worth a try. Thanks for the follow up!

Yeah, LM is logical choice. For now, I will pop in 2XOPA227 on the adapter until I figure out the center channel.

By the way, I may borrow couple of AD797ANZ (DIP8) for the weekend. Not sure how that will pan out, but would be interesting to audition them nevertheless. I may move the OPA627 to headphone section, use AD797 for front speakers, OPA227 for sub. Will see ...
Let me know what you think. I have always liked the OPA2227 for Sub channels as they seem too tighten the bass right up, well on my gear anyway. Hopefully the information is helpful to you.
post #135 of 445
Quote:
Originally Posted by Incognito73 View Post
Need to use headphones
BTW, does it have a relay like the STX? but I think even the X-fi Xtreme Music did...I'm sick and tired of those soundcards making loud pops when I turn on/off the computer
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