HIFIDIY论坛-新LPF 1541胆板力战Studer A727!

mousedog 发表于 2005-10-21 21:58

新LPF 1541胆板力战Studer A727!

终于上了新LPF板!第一个感觉是声音很干净,背景宁静了很多,每粒音符每个细节都表现到,高频表现亦改善很多.整段频带表现都几平均,现在的1541dac终可以坐下欣赏音乐.
究竟这部dac去到甚麽级数呢?刚好有部名器Studer A727,一于来场比试!
<img src="attachments/dvbbs/2005-10/20051021215722870.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/20051021215722870.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

先讲讲部Studer A727是换左4粒金封opa627AM,再加左本论坛的晶振clock板,本身亦是用TDA1541dac.系声音表现上有一定的水准,不是普通的cdp可比.
hifidiy的1541 dac用左飞利浦850MKII做车头,(本想用Studer A727但它的数字output无法用到?)
<img src="attachments/dvbbs/2005-10/2005102121591882.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/2005102121591882.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

要并当然用好d,上了我做了并联dac子板,用2粒1541R1(同期的).胆用吹喇叭金脚7308军用版,output cap用好野cap(HOVLAND - MUSICAP).
<img src="attachments/dvbbs/2005-10/2005102122152297.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/2005102122152297.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
<img src="attachments/dvbbs/2005-10/20051021222152190.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/20051021222152190.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

前级是lite M7B板,后级是仿krell100全对称甲类,喇叭是ProAc studio 1仔.

经过一番耳朶功夫,初步对论坛新LPF1541的声音有点体会,和A727两者声音取向虽然相似(大家都是用TDA1541),但在高,中频表现上就有较大分别.
在重要的人声表现上diy1541来得较有感情较甜美圆滑,而A727就较真实点,厚度A727略胜半分.
在高频方面两者分析力及质感都很好,diy1541还多了一份晶萤通透感(应该与输出电容用HOVLAND - MUSICAP有关),但A727始终是超取样OS及运放输出,在超高频diy1541怎也败下阵来.
至于低频方面是运放和胆输出的分别......
在营造音场上diy1541包围感较好,在size上A727就较阔较深些.
说句实话现在的diy1541dac绝对有力战Studer A727,这是最大的惊喜.
若各位有玩本胆1541dac的兄弟,真的要上新版的胆LPF,改善是绝对令你觉得值用100元.
亦不要浪费了钳子及众兄弟的努力,要做出频响咁好的LPF是十分不容易的.....
现心里有点念头想对这份diy1541下功夫,主要是胆输出部分原设计好像未能玩尽6DJ8.....
好友知我的diy1541开声了,带了几只唱死机的cd片考考它....他听后亦觉这1541dac声音不错,过关!!

以下是引用B在2005-10-21 22:31:00的发言：

順带一問 ,見你已用過多款OUTPUT CAP,那一款比較好 ?
同時單片1541和兩片1541聲音上有什麼改善

output cap我试了差不多十种(自己手上有的),

http://www.hifidiy.net/UploadFile/2005-10/20051021222152190.jpg
最好声是这支HOVLAND - MUSICAP,不过太大支都唔知怎放.全频表现一流,高频有种独特的晶萤通透感!

<img src="attachments/dvbbs/2005-10/20051021232724836.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/20051021232724836.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
这只Auri cap亦几好,高端延伸比MUSICAP更尽,但少了点弹跳力.

至于我地常用的TRW肠仔就总觉不够低频,中频抢了出来,虽然有种吸引的敲击乐韵味,如要用它要加大至1.5uf以上.
平价的solen亦唔差,并粒0.1uf(如MIT)改善高频应几好.红WIMA MKP10,绿色ERO,RIFA(套件的)都较平淡.....其实我想试试jensen.....
以上都是在我的器材中表现,不一定在你处靓声!!
两粒1541并联在高频质感上好左,因I/V电阻要减半,噪声更低,用示波器睇方波更靓,但要用多14粒电容都是一问题,我的板板在这方面做了妥协!!
上张图大家看!
<img src="attachments/dvbbs/2005-10/20051023182229936.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-10/20051023182229936.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

这就是新版胆LPF的实际频响曲线,由20Hz至100KHz,由专业audio tester测出来!

mousedog 发表于 2005-10-23 22:24

5楼说得对!NOS方式下高频是有损失....

我曾用示波器观看dac胆输出端,发现旧版的在约5KHz开始幅度就有衰减,到十几KHz衰减量已不能接受!现在用新的LPF就全频基本平直,上图曲线突出的部分就是补偿了NOS方式高频的损失.
还有重要一点是新LPF的高频谐波失真是比旧版少很多的,这令到新版声音有更纯更干净之感,分析力及貭感都大大提高!

Radeon 发表于 2005-10-23 21:39

我也在试胆LPF

aeon 发表于 2005-10-23 21:17

那个突出的部分就是补偿

1541nos方式下的高频损失。如果是从1541过去测应该是十分平直的。这个在小鬼头的玩尽nos 的文章特别的说明了。这个在补偿量，平衡，带外噪音的取舍曾十分认真的做过比较，才有这次的胆版LPF，没兴趣的人就不要玩了。

小钳子 发表于 2005-10-23 21:11

这个贴是我从1541专题转出来的!

这个1541胆版已经面目全非!应该属于进行很大改进!也积累了很多的心得!

我也仔细留意了一下mousedog从第一版本1541一直制作到现在版本的全过程!有几点特别值得学习!
1)mousedog一直坚持在一个主题内部发布自己的制作和改进心得,这个对文章的连贯性非常好!--这个也是小鬼头版主一直倡议的做法,因为在一个主题中连贯性发贴会给大家很多帮助
2)作者在自己的改进过程中对论坛提出了改进建议并提出意见!能在论坛设计基础上完善和根据自己的爱好调声!---这点值得推荐!

同时也请楼主能反馈噪音问题!这个问题现在有论坛会员提出!
我们将直接接受任何意见!

gwp3 发表于 2005-10-23 21:02

看来需要试试新LPF

HQ 发表于 2005-10-23 20:58

.

yome808 发表于 2005-11-3 00:22

這個接上可能更好 (^0^"

http://us.a1.yahoofs.com/users/41a83c56z7592f823/7393/__sr_/9516.jpg?phmhOaDBkyKuVn4b<img src="attachments/dvbbs/2005-11/200511302111660.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-11/200511302111660.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><img src="attachments/dvbbs/2005-11/200511302140317.jpg" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-11/200511302140317.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />

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