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Old 25th February 2011, 07:39 PM   #11
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Sweet or "rich" sounding opamps might produce muddy sound eventually while mixing multiply channels together. That is why pro stuff has purist opamps inside from the beginning despite the fact that prices for pro equipment would allow manufacture use juicy:-) ones instead.

NS LME ICs claimed to be clean sounding might be right choice for a mixer upgrade.

I do have M-AUDIO 2496 with AD8620 that replaced original JRC IC playing right now. It's sounding OK for home playback but I would hesitate use its output for monitoring purposes since to my taste it does have its own sonic signature now.
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Old 25th February 2011, 10:58 PM   #12
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Let me explain a bit better what my goal is. I am not completely oblivious to circuits and electronics, just not experienced. I love the mixer I have and it is awesome quality for the price ($1200). I am currently working on a home album, and want to get the best quality for the lowest price possible. I just don't have thousands of dollars to spend on top gear, or studio time. But.. with an external preamp, a good mic, and a good ad/da I am set. The problem with the Projectmix is it has no direct bypass for its Mic or TRS inputs, which means any gear that I run through this unit will pass through its internal opamps. If I have a $3000 NEVE, and run it through any channel, I will get coloring of the internal opamps (making the NEVE sound a bit sloppy). I don't mind the coloring if it is tasteful, but I find that the stock ics are a bit noisy and muddy (NOT LIVELY/CLEAN). I assume with better ics, caps, etc, I should be able to get better quality sound in general. Only other option is to go with a preamp with adat/spdif to bypass the internals of the mixer (costs rising into thousands). Suntechnik... I would love this board to have its own "sonic signature", that would make my sound unique. Might look into those ics... Main point is... I want the best mods on the cheap for a cleaner sound. -Thanks for the advice
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Old 25th February 2011, 11:27 PM   #13
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You can try to get some samples of LM4562 (DIP and SMD, identical with LME49720) or AD8599 (SMD) - those sound very "clean" in my oppinion...
OPA2134 is another good one (maybe not that good, but very close) - you said already that will try that one.

Last edited by SoNic_real_one; 25th February 2011 at 11:31 PM.
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Old 26th February 2011, 08:27 AM   #14
Mooly is offline Mooly  United Kingdom
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Noise (hiss) will be as much down to the circuit design as the opamps and swapping opamps isn't going to alter that much.

Sonically I think you will gain a lot if you are attuned to that kind of thing...

It's a bit like taking a $10000 amp and speaker set up of your choice and using a $100 CD player against a $2000 one.

Both will sound "good", but one will on extended listening have "other" subtle qualities that shine through. To some that difference is everything... to others... they can't tell the difference.

So go and try it
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Old 26th February 2011, 09:00 AM   #15
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Quote:
Originally Posted by bisszerk View Post
... I am currently working on a home album, and want to get the best quality for the lowest price possible....
You would be surprised as to how many very high end studio desks use 5532s and 4580s. Much more important are skills such as mic placement, correct gain structure and use of EQ and outboard, rather than op-amp brand. And they don't cost anything.

:edit:, Oh, and I've also moved you to the correct forum.
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Old 26th February 2011, 10:17 AM   #16
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that explains why I could not see the thread, only the title !
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Old 26th February 2011, 10:23 AM   #17
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Quote:
Originally Posted by bisszerk View Post
I would love this board to have its own "sonic signature", that would make my sound unique. Might look into those ics... Main point is... I want the best mods on the cheap for a cleaner sound. -Thanks for the advice
If your mixer's PCB use SOIC8 (probably it is) I would add to the list THS4032 or AD8066 besides National Semiconductors opamps and OPA627 (it is mono so needs appropriate adapter use two OPA627 instead of single dual opamp).

Electrolytic capacitors Nichicon Muse Bipolar or Elna Slimlic is a modern choice. Old days Black Gates considered to be the best but they out of production nowadays. I do no like film capacitors in sound path but many reviewers favor ones with Teflon dielectric especially. I am OK with electrolytic decoupling capacitors mentioned above if I cannot use foil ones like Jensen. Unfortunately foil capacitors are pretty expensive besides their huge size - the most limiting factor - so they are suit tube gear or speaker crossovers not modern PCBs. Imho film capacitors just a trade off they are not small like electrolytic ones and not as good sounding as foil ones.

partsconnexion.com is a good place to order capacitors and other audiophile related stuff newark.com - for ICs.

Probably moding mixer with a different OP AMP per every channel and see what channel works best for particular type of recording might reveal full potential of available ICs. It might be beneficial using not just one type of opamp in the mixer finally.
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Old 26th February 2011, 11:31 AM   #18
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that explains why I could not see the thread, only the title !

Hmm, I'll have to look at that, it should have left a redirect.
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Old 26th February 2011, 11:37 AM   #19
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Originally Posted by pinkmouse View Post
Hmm, I'll have to look at that, it should have left a redirect.
Same for me, two email notifications, one worked and this one didn't,

http://www.diyaudio.com/forums/chip-...-new-post.html
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Old 26th February 2011, 11:39 AM   #20
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Can't find anything wrong, it may be a software "feature", I'll get the techs on it.
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