【讨论】现在最好的单运放是？

[lighting]

常言道，前级出声（音质），后级出力（功率）, 这句话比较形象地讲了前级和后级的重要性，以及前级与后级的关系。

前级包括声源CD, DVD，声卡，Media Player, 及调音设备。

打磨前级，最方便的无不是换运放，可以达到立竿见影的效果，

好久不这样做了，记得以前以NE5532,TL082 换LM324，那音质可是立马上了一个档次，

我现在手痒了，ASUS XONAR ESSENCE STX 的原装Op-amp 是JRC2114D($0.30, 稍好于NE5532) 的，

换成AD8620， 或Asus 建议的LME49720N($10)？

[老广]

大概没有最好。各有特点。还要配合整个系统。以前找过一下：http://www.chinasmile.net/forums/sho...d.php?t=471310
先看看原来电路的电压再找。你肯定是用单的封装？LM4562是双的。

[jianghy]

作者: lighting

打磨前级，最方便的无不是换运放，可以达到立竿见影的效果，
好久不这样做了，记得以前以NE5532,TL082 换LM324，那音质可是立马上了一个档次，
我现在手痒了，ASUS XONAR ESSENCE STX 的原装Op-amp 是JRC 的，换成LM4562， 或Asus 建议的LME49...

你没弄错吧? 我还没见过音频通路用LM324的, 普通就是4558双运放, 稍好点的用5532. 另外5532是双运放.
只换运放音质就上了一个档次? 多半是心理作用. 原来国内的音响杂志吹的最多了.

[lighting]

作者: 老广

大概没有最好。各有特点。还要配合整个系统。以前找过一下：http://www.chinasmile.net/forums/sho...d.php?t=471310
先看看原来电路的电压再找。你肯定是用单的封装？LM4562是双的。

Dual for one channel。我现在是信息收集阶段。运放因是集成电路，有点像软件样，不断有update 版本。所以许多HiFi厂家直接用插拔式安装，以利于用户自己更新。

还有一个AD8620， 似乎也不错。

[lighting]

作者: jianghy

你没弄错吧? 我还没见过音频通路用LM324的, 普通就是4558双运放, 稍好点的用5532. 另外5532是双运放.
只换运放音质就上了一个档次? 多半是心理作用. 原来国内的音响杂志吹的最多了.

90代初，LM324国内前级很多就用它。如果你玩过TDA2030, 就应该见过。

运放是前级的心脏，对音色的影响太大，所以这就是为什么很多人要用Pure Direct Mode，去跳过运放对音色的影响。

你不要看你的前级或合成功放要几千美金，能打磨的也许就是这个运放！特别是一些老功放，CD机，媒体播放器，看看有无必要化20美金，去换一个最新的或减了价的发烧级的。这比几十美金换线要有效得多！

[lighting]

简单查了一下，90代的补品，比如NE5532, 已沦为垃圾，对比一下，
slew rate 电压转换速率， 它的指标，直接影响高频听感和瞬态响应速度！

LM324: 0.4v/μs
NE5532: 9v/μs
TL082: 13v/μs
OPA2107:18v/μs
LME49720: ±20V/μs
LME49860: ±20V/μs
LM4562: ±20V/μs
AD8620: 50V/μs
AD8066：180v/μs

而AD8620, Ebay 价约$10.

[lighting]

转一篇同好写的听感，可惜是2005年写的。

他推荐的AD8066：180v/μs.

评语：Excellent BASS, fast, detailed, good imaging, with a pleasant 'airy' feeling. This Op-Amp really brings music to life.

---------------------------------------------------------------------------------

Flavors of Audio Op-Amps

I was looking for audio Op-Amp that suit my ears, so I decided to test a few well known audio Op-Amps from Burr-Brown (OPAs) and Analog Devices (ADs).

Amplifier : 'My Modified Pimeta Clone' DIY HeadAmp
Source and Headphone : Panasonic PCDP SL-CT810 and Grado RS-1
CDs : Ultimate Demonstration Disc from Chesky Records, Women of Song from Chesky, Best of Audiophile Voices, Jennifer Warnes – The Hunter, and some other CDs.

So, I tested them with bright, lively sounding, and very revealing headphone. And for my taste of music, vocal is very important. I like thick and warmth midrange.

There is no exact measurement to describe how audio equipments sound. All measurements are subject to personal taste, so this Op-Amp comparison is only a sharing of my experience with those Op-Amps, with hope there will be readers benefit from it.

My Opinions:

AD8620
Very bright and lively sounding Op-Amp. The treble sounds a bit too dominant. Very good detail and imaging. I love the transient and impact of the AD8620. My only complain with this Op-Amp is the treble, a little bit too sharp, and the color tends to the metallic sound.

The good : Bright, very good detail, lively sounding, the most transparent sounding so far.
The bad : Treble can be sharp and harsh with bright headphones.

Application: Not to be paired with bright headphones. You might get ears fatigue. Probably good for Senns, but not for Grado. I still can enjoy it with my RS-1 though, but only for certain recordings. Very good detail and resolution will reveal recordings flaw. So, this Op-Amp is only for good recordings.

OPA2604
Sweet, but veiled sounding Op-Amp. It’s sounds the other way of AD8610. Not bright, veiled, with poor detail. There is no way you will get ears fatigue with this Op-Amp, but you might get bored. It is not a lively sounding Op-Amp. It is not bad, it has a nice color of sound, just a bit mellow with strong Burr Brown’s laid back signature. Some people might like it.

The good : Sweet, warm, never sound offensive, good for long hour easy listening.
The bad : Poor detail, veiled, mellow, far from lively.

Application:
To be paired with very bright and lively sound headphones. For those who like long hour easy listening, this Op-Amp might be the choice. As it will hide many details, it might be good to listen poor recording with this Op-Amp.

OPA2228
Very nice natural sounding Op-Amp. I like its treble. Not too bright, just nice. It has the laid back Burr Brown sound, but light not as strong as the OPA2604. It is not very bright and lively, but not heavily veiled either. For Senns it might sounds analytical, but for the lively sounding Grado, it makes the Grado sounds well controlled. I can use this Op-Amp for a long hour listening with Grado without getting ears fatigue. Good detail, but not as good as the AD8620. The midrange and bass are slightly thicker than the AD8620 which are nice. Overall, I like this Op-Amp in my headamp paired with Grado, it sounds natural and really ears friendly. I can feel a lot of 'air', like listening to the singer in open air. When you listen to my amp with this Op-Amp, it is not a WOW, but its sweet, and you might wear the headphone longer. I just miss the lively sounding and transparancy of the AD8620 a little bit.

The good : Natural and sweet. Very nice treble, good midrange and bass.
The bad : Not as detailed as the AD8620, and slightly slow in transient and impact.

Application:
To be paired with bright and lively sound headphones. Very nice for long hour listening, better than the OPA2604. As it is not highly revealing amp, it forgives flaw in recordings. I might put this OPA2228 permanently in my ‘Pimeta like headamp’, it is very nice to be used for listening my ‘non audiophile’ CD collections.

OPA2134
Putting this Op-Amp in Pimeta doesn't change it's sound characteristic a lot. Just a tad more transparent (only a tad) compare to CMoy. I would say that this Op-Amp has the worse imaging than others that I have tested. Very narrow, narrower than my PCDP output. Very narrow space between the singer and the musical instruments, sometime feel like putting my head in a bucket. It only good in bass, nothing else. So for some music from MIDI, which doesn't need imaging at all, this Op-Amp is fine. It has big bass and thick midrange, which is good. The treble is a bit 'short', means bell's sound will sound shorter than the AD8620 or OPA2228. Ok, I have no intention to make it sounds like a bad Op-Amp. OPA2134 is a good Op-Amp, very DIYer friendly, and they have nice sound color of which I like. My complaint is only the narrow imaging, that's all.

The good : Big bass and thick midrange. Nice color of sound.
The bad : Poor imaging.

Application:
I think this Op-Amp need bright, transparent, and wide imaging headphone to balance it's narrow imaging characteristic. This Op-Amp is a NO NO for people who demand good imaging, probably another good alternative for those who like music from MIDI / electronica, and like BIG bass.

AD8066
This Op-Amp dethrone the OPA2228. It sounds much better than the OPA2228. It has the AD signature, bright and fast. What I like most from AD8066 is the BASS. It has excellent bass, bigger than the OPA2228 and AD8620, and it goes lower. It has very good low bass. For comparison, OPA2134 also has good bass, but more to the mid bass, while AD8066 has better overall bass. My headamp is DC coupled, so it takes all frequency from DC. If yours is AC coupled, you might not be able to hear or feel the excellent low bass from the AD8066. Try 'The Hunter' from Jennifer Warnes to test the bass.

If OPA2134 'KICKS' then the AD8066 'KICKS' and 'SHAKES'

This AD8066 is not only good in bass. It also has excellent imaging, about the same as the AD8620. I love the treble which is a tad smoother, more 'airy' than the AD8620 which I often feel a bit sharp. So the conclusion is, excellent Op-Amp, very neutral, excellent bass, crystalline clear mid and treble (very good transparancy), excellent imaging, fast and detailed.

The good : Excellent BASS, fast, detailed, good imaging, with a pleasant 'airy' feeling. This Op-Amp really brings music to life.
The bad : Depend on personal taste, might be too bright for some people.

Application:
Eventhough I think this Op-Amp is an excellent general all-purpose audio Op-Amp for any headphone, but it tends to sound bright. With good recordings (non-metallic treble recording), this Op-Amp sounds very good with my RS-1. AD8066 is very revealing, you will hear any flaw of poor recording. For poor recording, OPA2228 might still preferable.

OPA637
I agree with most of the DIYers that said that this OPA637 (and OPA627) is one of the best Audio Op-Amp. It is the most expensive as well . I didn't have enough time to listen to it, just a few tracks of Chesky Demo Disc, so my comment here will be based on mine and my brother comment (I bought the OPA637 for him). I use this Op-Amp in the headphone amplifier I made for my brother, which in theory has the same circuits as my headamp.

It sounds Very Very Very natural. Almost no coloration, very musical with high listening pleasure. It has thick bass and midrange, with just the right level of treble for my Grado RS-1. The imaging is excellent. Comparing with AD8066, the AD8066 is a tad brighter, and slightly has more space in between the singers and the musicians, but the different is subtle. The OPA637 has the laid back Burr Brown sound which I like, but it is very minimum comparing with other OPAs.

The good : Very neutral and musical. Thick bass and midrange with transparant treble. One of the best Audio Op-Amp.
The bad : Probably a little dark for dark Headphone, slightly laid back sound which might not suit some people.

Application:
The best general Audio Op-Amp. Highly recommended for Grado users, or other bright sounding headphones. For Senns users, please audition before you spend the money for this Op-Amp.

OPA2107
If you like Burr Brown sound but OPA627/637 is way out of your budget, try OPA2107. It has the color of the expensive OPA637. So far amongs the other OPAs I tested, this is the one that is close to the OPA637, but it doesn't have the superb detail and the good imaging of the OPA637. It has a natural-dark sound, with very good bass and midrange, the treble is fine, but not as transparant as the ADs. It also has the BB laid back signature, more laid back than the OPA637 and OPA2228. I rolled back and forth with OPA2228 (which I like for being very warm and sweet), OPA2107 sounds more natural, faster, with more accurate and better imaging. But it is a bit darker than OPA2228. So for it's price, between the OPAs, it sounds right. More natural & faster than OPA2134, OPA2604 & OPA2228. Compare to the AD8066, I prefer the AD8066 for having better imaging and more transparant treble.

The good : One of the best Burr Brown Audio Op-Amp for the price. Natural-dark sound good for bright headphone such as Grado. Excellence Bass and Low Mid, very tight and thick. It sounds musical and enjoyable, good for long hour listening :cans:
The bad : Dark sound not good for dark Headphone. Laid back sound which might not suit some people. The imaging is narrower than the AD8066 (but wider than the OPA2134, OPA2604 & OPA2228). The treble is a bit too dark for me, not as transparant as the AD8066.

Application:
Good general Audio Op-Amp for it's price, recommended especially for those who like the dark and laid back Burr Brown sound. Recommended for Grado users, or other bright sounding headphones.

Now I'm still using the AD8066 in my Amp, so far it is the best sounding Op-Amp for me.

[lighting]

大家似乎都不感兴趣。但我得把作业做完，希望对同好者有用，节省点时间和金钱。

最后narrow down 到三个：

LM4562<新版LME49720, sounded a bit warmer>，AD8620，AD8066。

最好AD8066，可惜电压限制+/-12v ，

电压如果太高的话，就选LME49720。

以下是摘选的Reviews:

4562 - very nice sounding and adequate detail, but not outstanding. There's nothing wrong with them, however they don't stand out as exceptional either.

8620 - nice forward sound, all tonal frequencies are represented with lushness and aggresion, but many details are lacking - I know this b/c many reference tracks I use have entire sections deleted from representation. Not for audiophile use IMO.

8066 - prior to adequate settling time (1 hour's impression): superb accuracy and dynamics, tonally accurate (however a bit bassy - that's likely to settle down with 'age' IME), very high resolution, decent spaciousness to sound, excellent imaging for an op-amp. Impressive level of detail so far. I can see how some would see this as boring - the sound can be dry if the source material and delivery machine is less than stellar (e.g. standard ipod headphone out, mp3 files, most sound cards).

used an 8066 in my dynaco cdv-pro and won't go back to anything else. Very detailed, excellent low end articulation and no ringing on the top whatsoever.

[yyqq]

若谁手里有闲置的DVD或CD 机,查一下,试试. 思路有道理. 关注.

作者: lighting

大家似乎都不感兴趣。但我得把作业做完，希望对同好者有用，节省点时间和金钱。

最后narrow down 到三个：

LM4562<新版LME49720>，AD8620，AD8066。

最好AD8066，可惜电压限制+/-12v ，

电压如果太高的话，就选LME49720。

以下是...

[老广]

作者: lighting

简单查了一下，90代的补品，比如NE5532, 已沦为垃圾，对比一下，
slew rate 电压转换速率， 它的指标，直接影响高频听感和瞬态响应速度！

LM324: 0.4v/μs
NE5532: 9v/μs
TL082: 13v/μs
OPA21...

这东西我看用在CD机就作用不大了。CD的可还原频率有限，20KHZ以上都要滤掉。如果你的CD机很差，还会有点用。还有太快的东西，听起了就更多数码声。
好的石机功放都千方百计设计成胆机的味道，就是声音听起了“WARM"。还不是把高频的东西滤掉？跟这些作用完全相反。胆机之所以WARM，原因之一就是有带通滤波器的功放，变压器的特性。而石机是一个宽带功放。

[lighting]

你说的对，胆机之所以WARM，原因之一就是有带通滤波器的功放，变压器的特性。

但好的运放不只是高频性能，低频，声场，中音解析度都有影响。

还有你说的数码声， 简单的说，是原声（模拟声）44.1hz(CD) 16bit采样后，频率不够高，很多信号未采进去，然后，又从数码1和0转换到模拟声，这时，你得滤掉采样信号，44.1khz 离人耳可听见20khz太近，低通滤波器的局限，把采样信号混进了原声里，高频就刺耳，所谓的数码声。所以，现在不用CD了，改为24bit/192hz, 低通滤波器就好做多了，数码声得以最大削减。

声音听起了“Smooth"，其实是数码方波的极少化，本来声音不管高频低频都是圆滑变化的，经数模，模数转换后，一个个圆脑袋变成了方脑袋，本来是斜坡变成了台阶，所以你就觉得数码了。

[lighting]

今天，收到了网购的顶级最新运放3个LME49860， 并替换了DAC 后的两个 I/V 转换JRC2114D，及一个Buffer LM4562.

LME49860 其实是LM4562 的新版LME49720的升级版。

换后听感，

1. 低频Level 升高，所以我得减Sub level 两格。Sub crossover 频率在40hz.

2. 听到了 Bay/Bloor Radio ARCAM A38 Integrated Amplifier 组合曾听到的细腻高音，随还不够如同一般的火候。

3. 整个音场，Relax 了很多。

我是直出到功放，功放PURE Direct Bi-wire 输出，一直没有要Pre-amp 去调高低音的需要。

给大家一个图作参考，图中的6个单运放就是我要换的3个双运放。

[我爱奔驰]

莱大侠，你住在哪里？

[lighting]

作者: 我爱奔驰

莱大侠，你住在哪里？

我在多伦多北部，华人聚集地。你要搬到多伦多的话，我很熟！

[dalplex]

能听出区别就好。

我换了3对顶级火花塞本来以为能飞天上去。结果还是步履维艰。

[我爱奔驰]

作者: lighting

我在多伦多北部，华人聚集地。你要搬到多伦多的话，我很熟！

Richmond hill，有钱银！

[lighting]

作者: 我爱奔驰

Richmond hill，有钱银！

你似乎对多伦多也不陌生！可惜猜错了，那里交通不方便。

[lighting]

作者: dalplex

能听出区别就好。

我换了3对顶级火花塞本来以为能飞天上去。结果还是步履维艰。

没想到多伦多还是有同好的，我还以为就我在换”火花塞“， 不知你换了啥？

经过来回比较LME49860，LM4562（原装Buffer), 虽说LME49860是LM4562 的后续版本，但低音我还是更喜欢LM4562, 更Tight点（有点出乎意料）。所以现在LM4562在Buffer位置，两个LME49860在IV位置。

现正继续研究，想继续换着玩，如果有人感兴趣的话，我会贴出实验结果，或者互换你我剩余的opamp。

[100khz]

SIP,DIP,8SOIC几乎各种封装都用电络铁换过
LZ是住Markham吗?
能换8SOIC,手艺不赖嘛。
可惜没时间，想把功放的OP也换换试试

[lighting]

作者: 100khz

SIP,DIP,8SOIC几乎各种封装都用电络铁换过
LZ是住Markham吗?
能换8SOIC,手艺不赖嘛。
可惜没时间，想把功放的OP也换换试试

你这人厉害，既玩电子设备，又玩乐器，虽然都用手，我知道那很不一样。

我住AY.