you can post it to yuheng after you'd pick your opamps. I'll get the remaining ones from him during our 2nd meet alright?pm me your postal address
DIY HACK MOD, Everything paranormal and ™ infringement
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 Jun 30 2007, 10:59 PM
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All Stars
12,214 posts Joined: Jan 2003 From: Singapore | Malaysia  
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you can post it to yuheng after you'd pick your opamps. I'll get the remaining ones from him during our 2nd meet alright? pm me your postal address |
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Jul 8 2007, 08:37 PM
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Senior Member
6,934 posts Joined: Jan 2003 From: Audiophilia valley... 
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QUOTE(yrh0413 @ Jun 27 2007, 11:22 PM) I have quite a handful of opamps with me now. Let me generate a brief impression on each of them. yrh posted me some opamps. Tried some of his recommends, swapping between DACs and DAC pre-amps and critical listening took me almost two days. Equipments: as stated in my siggie Songs tested: 1. Corrinne May - Angel in Disguise (Safe in a Crazy World) 2. Johann Strauss II/ Josef Strauss: Pizzicato Polka (Denon Hi-Fi Strings XRCD) 3. Pachebel: Canon (Denon Hi-Fi Strings XRCD) 4. Mozart: Sinfonia Concertante for Violin, Viola & Orchestra in E-flat Major, KV364 (320d) (Denon Hi-Fi Strings XRCD) 5. Il Divo - I Believe in You (Ancora) 6. Arne Domnerus - Limehouse Blues (Jazz at the Pawnshop Disc 1) 7. Diana Krall - Black Crow (The Girl in the other Room) 8. Jane Zhang - 我用所有报答爱(The Banquet) NE5532 - Heed Audio CanAmp's stock opamp - Bass is thin/moderate. Not as impactful as other opamps I'd tested. - Huge loss of details, imaging is below average. Good for classical perhaps, coz it kindda eliminates details such as flipping the scores, tapping feet etc - Vocals are very much cold and sterile. Corrinne May sang as if she just got dumped by her boyfriend. - On I Believe in You, you know you're listening from a pair of headphones. National Semiconductor LM4562NA - Airy - Laid-back sound signature, but vocals are a little forward. - Details are everywhere. Imaging is excellent too. - A bit on the dry side, especially on classical. - Bass is moderate and refined, outperforms the NE5532. - Not musical. It sounds good, but it is not a keeper imho. National Semiconductor LME49720NA - Sounded quite the same as the LM4562NA. It is airy, very detailed and good imaging. - Bass is stronger and more refined than the LM4562NA. - Not as sterile as the LM4562NA, a little warm which makes it much more listenable than the LM4562NA. Analog Device AD823AN - Bass is strong, on par with the LME49720NA - Vocals are quite forward. However the AD823 performs exceptionally well on vocals compare to the other opamps. - A musical opamp. Performs well in classical Analog Device AD DY2000 - Similar to the AD823AN, it has stronger bass. - Its performance on vocals is still very much the best among the rest. BB OPA2107 - Forward vocals - Warm sound signature - Narrower soundstage BB OPA637BP on dual-to-single browndog - vocals are not as forward as the 2107 - i guess all OPAs inherits the warm sound signature? - good details, expansive soundstage too - the most musical opamp among the rest - hard to stabilize. Having some minor issues with my Heed Conclusion: Most detailed award: from NS (i prefer the LME49720NA) Best vocals award: AD DY2000 Best overall performance: AD823AN currently sitting in the opamp socket in my Heed: the 637s haha!   And I have to match two equipments I have here, the MS2i and AegoM, took me lots of time. Below are my personal opinion and preference, just make them as a pleasure reading Stock opamps are using OPA2604AP in its DAC, which sucks up too much details, what I mean a lot is really A LOT!!!  So anyone who is using Zhaolu please swap it's opamps at least, a small price to pay for big improvement.NE5532 Since yrh says it's bad, I just dump it aside and never touch it. National Semiconductor LME49720NA Laid back signature, very expansive soundstage, warm, and added credits to my AegoM, Details are freaky awesome  and one of the best imaging. The vocals are more forward than the background. Bass is a tiny bit stronger and detailed than the stock. A little colourful signny. National Semiconductor LM4562NA Laid back sound, but in oppose to yrh, I feel that vocals are laid back, that's weird...  Maybe different rig produce different results.Another awesome detail producing opamp Expansive soundstage again... Dry and sterile, natural. Not as colourful as LME49720. Analog Device AD823AN Refine bass, but it does improve a little bit of here and there but actually I cant differentiate much with the stock OPA. Vocal is laid back, er... different results again. I only have one of this, so this is on my DAC-preamp. I dont like this on my MS2i, dont feel the 'intimate' feeling that I have on my stock OPA2604, in fact I would prefer the stock. Analog Device AD DY2000 Strong and refine bass, vocal is sOOO much better than the 2604 and AD823AN, I was hooked on to this and listened for quite a few hours and finally decided this is my taker for my DAC-preamp. Sounds very intimate with a forwarded vocal and good separation presentation. BB OPA2107 Ok, this is BB (bye bye) for me too, narrowed down my soundstage for my AegoM. Took it out for just testing a few tracks. It's warm and more detail than the stock opa. The DACs are direct output to the AegoM, in the end I took the LME49720 as my DAC opamps and DY2000 for my DAC-preamp board. Enjoy |
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Jul 8 2007, 09:56 PM
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All Stars
12,214 posts Joined: Jan 2003 From: Singapore | Malaysia
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 haha, now everyone's Zhaolu is a different beast d. |
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Jul 8 2007, 10:07 PM
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Junior Member
236 posts Joined: Jan 2003
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walabis bro pls find also the LME49860 and AD8599
u all sifu impression is really useful for all those wanna playing opamp roiling....... |
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Jul 9 2007, 12:14 AM
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Junior Member
157 posts Joined: Mar 2007 From: P.J
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walabies,wats ur ZL version?
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Jul 9 2007, 04:54 PM
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Senior Member
6,934 posts Joined: Jan 2003 From: Audiophilia valley...
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QUOTE(skydna @ Jul 8 2007, 10:07 PM) walabis bro pls find also the LME49860 and AD8599 The opamp sifu and supplier here are empire23 and yrh0413, I cant help you much u all sifu impression is really useful for all those wanna playing opamp roiling.......  QUOTE(nicholas0507 @ Jul 9 2007, 12:14 AM) walabies,wats ur ZL version? 2.5A. You just sold it?  Need do some modding to unlock it's potential la...  Now it's revived. |
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Jul 9 2007, 05:09 PM
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Junior Member
398 posts Joined: Dec 2004 From: Am Neckar
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QUOTE(walabies @ Jul 9 2007, 04:54 PM) Need do some modding to unlock it's potential la... Now it's revived. I have Zhaolu 2.5C. Can u give some recommendation? |
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Jul 9 2007, 06:37 PM
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Senior Member
6,934 posts Joined: Jan 2003 From: Audiophilia valley...
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QUOTE(slacx @ Jul 9 2007, 05:09 PM) What modding must I do to unlock it's potential? You signature shows that you have swap it's opamps.I have Zhaolu 2.5C. Can u give some recommendation? Lastly you should send for those expert for mods (e.g. Ijan, empire23 etc) » Click to show Spoiler - click again to hide... « |
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Jul 9 2007, 09:52 PM
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Junior Member
157 posts Joined: Mar 2007 From: P.J
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QUOTE(walabies @ Jul 9 2007, 04:54 PM) 2.5A. You just sold it? Need do some modding to unlock it's potential la... Now it's revived.  My LM49720 just arrive in my hand today afternoon...now busy rolling in with LM4752... |
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Jul 9 2007, 10:02 PM
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Senior Member
6,934 posts Joined: Jan 2003 From: Audiophilia valley...
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Happy rolling
Describe the difference in your setups? |
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Jul 9 2007, 10:34 PM
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All Stars
12,214 posts Joined: Jan 2003 From: Singapore | Malaysia
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nicholas0507 how did you roll opamps? Roll all 3 with the same ones?
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Jul 10 2007, 08:32 PM
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Junior Member
111 posts Joined: Apr 2005
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QUOTE(nicholas0507 @ Jul 9 2007, 09:52 PM) Nola....it serve me vey well hey, mind to tell me where to get the LME49720NA? My LM49720 just arrive in my hand today afternoon...now busy rolling in with LM4752...  |
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Jul 10 2007, 09:19 PM
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All Stars
12,214 posts Joined: Jan 2003 From: Singapore | Malaysia
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 NS' samples program of course. |
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Jul 10 2007, 09:36 PM
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Staff
9,417 posts Joined: Jan 2003 From: Bladin Point, Northern Territory
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Here's my completed PPAv2, recently returned from Eokboy.
Currently lacking PSU.  |
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Jul 10 2007, 09:55 PM
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Senior Member
6,934 posts Joined: Jan 2003 From: Audiophilia valley...
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Are you really selling it 1k?
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Jul 10 2007, 10:06 PM
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Junior Member
157 posts Joined: Mar 2007 From: P.J
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QUOTE(yrh0413 @ Jul 9 2007, 10:34 PM) nicholas0507 how did you roll opamps? Roll all 3 with the same ones? currently i only try roll all 3 with the same,well...LM49720 is totally listernable than LM4562.Not LM4562 is less detail,it just produce a little bit different from sound signature...both these opamp can pawn ZL stock opamp easily,detail is every way,major different is only the vocal.LM49720 produce more upfront vocal than LM4562, and the vocal is more refined...i can different it when listern to piano track,every note is more detail and real... will try 2+1 later... Added on July 10, 2007, 10:09 pm QUOTE(walabies @ Jul 9 2007, 10:02 PM) Happy rolling hopefully can listern again sound from AD chip,me only 1 time to listern it before(yrh0143 punya) and almost forget it already... Describe the difference in your setups? Added on July 10, 2007, 10:14 pm QUOTE(Edwin @ Jul 10 2007, 08:32 PM) hey, mind to tell me where to get the LME49720NA? yrh0413 is rite....just go NS web join the samples program...Oh..ya...wana say thnks alot to yrh0413...thanks for sharing about samples program lastime...really appreciate ur sharing thanks..thanks..thanks.... This post has been edited by nicholas0507: Jul 10 2007, 10:15 PM |
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Jul 10 2007, 10:32 PM
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All Stars
12,214 posts Joined: Jan 2003 From: Singapore | Malaysia
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 aiseh man, i accidentally bump into their samples program last time. Then "stole" LM6172s, 4562s, and 49720s from them. |
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Jul 10 2007, 11:46 PM
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Senior Member
941 posts Joined: Nov 2005
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Can we still get free samples from National Semicon or other manufacturers? esp those audio IC we need.
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Jul 11 2007, 12:04 AM
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Staff
9,417 posts Joined: Jan 2003 From: Bladin Point, Northern Territory
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QUOTE(walabies @ Jul 10 2007, 09:55 PM) Are you really selling it 1k? It does cost an average of 800 ringgit a board to build. The PPAv2 is certainly a very high end amplifier, sports a discreet buffer, separate supply rails, multiloop feedback, FET input and noise reduction, class A transistor output and adjustable bias. Comparing it to amps out there, a good equivalent is a Headroom Max in terms of topology, and the Max goes for 4k ringgit.Maybe i'll sell it for 1.2 depending on my needs. Add 200 for a case and casework with nice jacks, add 60 for silver wire and 400 for a STEPS PSU. If you wanna go balanced it should be 400 for casework, 100 for Switchcraft XLR jacks, 800 for 2 seperate PSUs and 120 for a PEM Filter. That's about 3.4k for a balanced setup. But technically you'd have the ultimate headphone amp, even better than a PRII which goes for 1600 Ringgit unbalanced. |
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Jul 11 2007, 01:13 AM
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Senior Member
1,599 posts Joined: Jan 2003 From: Isketambola
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QUOTE(walabies @ Jul 10 2007, 09:55 PM) Are you really selling it 1k? It is truly worth the price. I can no longer go back to my PIMETA. Solid state amps of the same class would cost many times more. We're talking about a maxed-out PPAv2 here.Also I'd suggest uprading the wires. I put in those just for...testing. |
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