I think I may have found the answer from a previous post if the diagram is correct that is. It looks like greater than 1k so opa2301/2302 it is then.
http://www.diyaudio.com/forums/digi...p-xover-project-part-2-a-247.html#post4117397
http://www.diyaudio.com/forums/digi...p-xover-project-part-2-a-247.html#post4117397
Burson Audio Supreme OPS
Hi,
try the Burson Audio Supreme OPA! Sound improvement is amazing!
Best regards
Sigi
Hi,
try the Burson Audio Supreme OPA! Sound improvement is amazing!
Best regards
Sigi
I installed them in the middle ( 300-2000hz) and highs ( 2Khz-20Khz). Not in the bass region. Bass improved noticeably, I think because of the overtones, and it was as if a curtain was opended, more airy highs, more microdetails. It was as if the artists that were playing suddenly changed the way of playing music, this time with a lot of enthusiasm. Sorry for the somewhat unusual description, but that was it !
Cheers
Sigi
I have tried the LM833 (offcourse) after that the NE5532 and the OPA627.
I found the NE 5532 better than the stock LM833. Better definition better hights (i found the LM833 a bit grainy) but after a week i started to get annoyed by the NE5532. They are too bright for my taste. Then off cource you hear more detail, but it was out of balance imo.
The OPA 627 were a relief... from top to bottom a step up, better balance, not too bright, good/better definition. Very fine opamp imo. You can listen to it for days...
Today i recieved the Bursons... In a week or so i can tell you more.
I found the NE 5532 better than the stock LM833. Better definition better hights (i found the LM833 a bit grainy) but after a week i started to get annoyed by the NE5532. They are too bright for my taste. Then off cource you hear more detail, but it was out of balance imo.
The OPA 627 were a relief... from top to bottom a step up, better balance, not too bright, good/better definition. Very fine opamp imo. You can listen to it for days...
Today i recieved the Bursons... In a week or so i can tell you more.
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Hi,
yes, the OPA 627 was also the best before I installed the Bursons. You will like them!! am sure
Regards
Sigi
Hi,
the Bursons price is 130$ for a pair, OPA 627(2) on the special board between 80 and 100Eu. Be careful with low price types, they generally are a fake from china!
Cheers
Sigi
Don`t panic with cheaper chinese types. If you measure between pin 1 and 8
the 47k it is o.k. Most OPAs where build in China!
The 627 sound really good in the Najda. The Burson sounds a big step better for me! Also the Sparko discrete OpAmp does! The Sparko ist easyer to manage by his size! But you have to watch with Sparko and even more with Burson that the Power Supply can deliver the current! More then double current with each of your Opamp! And there are lots. I think Sparko likes a litte bit more the +-12V in the Najda.....
Regards
Ulf
The Bursons do not take a lot of space... although it is a tight fit 
Do take some height.
After one evening of listening i do not want to comment too much... but it is clear that they will replace the OPA627 opamps for sure.
Pics of my Najda (my firts DIY project btw): https://plus.google.com/u/0/1129376...6130475021855315506&oid=112937628903960323118
Do take some height.After one evening of listening i do not want to comment too much... but it is clear that they will replace the OPA627 opamps for sure.
Pics of my Najda (my firts DIY project btw): https://plus.google.com/u/0/1129376...6130475021855315506&oid=112937628903960323118
Hmm, you haven't installed them in the bass region, but bass improved noticeably? Well, then..
Don`t forget the analogue input!
Very, very nice build! But did you not forget the analogue input? The most important one?
regards Ulf
The Bursons do not take a lot of space... although it is a tight fit
After one evening of listening i do not want to comment too much... but it is clear that they will replace the OPA627 opamps for sure.
Pics of my Najda (my firts DIY project btw): https://plus.google.com/u/0/1129376...6130475021855315506&oid=112937628903960323118
Very, very nice build! But did you not forget the analogue input? The most important one?
regards Ulf
Hello Herman.
I did not use a SMPS. the first power supply was a liniair Sola, but i ordered the wrong one (no + -12V, so i did only use the 5V from that).
Compared to that the DIYINKH provided more silence end ease.
No... i didnt try it on the analog input. I use the WaveIO USB to I2S only for input.
I have a subwoofer for <80Hz and main speakers >80Hz. Both on the Bursons.
This is my first DIY project. I have soldering skills and a audiophile heart and ears... but absolute no electronic knowledge...
On the other hand... noticing that the discrete Bursons make a nice sound progress on a good IC like the OPA627 it is tempting to explore the analogue side of audio more...
On the other hand... noticing that the discrete Bursons make a nice sound progress on a good IC like the OPA627 it is tempting to explore the analogue side of audio more...
At diyinhk they have now a new 2x5v 1A power supply with 5x lower noise levels than the old one (0,8 uV). It is based on the new LT3042: 0.8uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2 - DIYINHK
I have ordered one to try it against the old one (i found that one allready very good).
Don't know how it compares to other PS off course.
Hmm, you haven't installed them in the bass region, but bass improved noticeably? Well, then..
Bass sounds better if mids and highs are better. Without goods high and mid bass is poor!
Cheers Peter