Sawstudio

这个CROSSFEED好像并没有在里面使用滤波，而是直接原始频率处理，而且也不能控制滤波的截点...

Sony MDR-V6。

己足够…及恰到好处。

[ 本帖最后由 dabeat 于 07-9-11 01:54 编辑 ]

如果说V6声音准确，这个我很赞同，但是说声场，虽然没有畸变，但我还是觉得有点...，和音箱区别还是很大的..


不过，我当时的V6是二手的，很难说是否有问题..

假如阁下是使用 NS-10M音箱 ，距离、室内面积、监听位置、
隔音设备，也恰当的话，V6应是不二之选。(只是小弟的经验)。

反过来说，设计录音室的建筑师/工程师，会不会拿 V6 参考 ??
只是认真的说说笑…....

Sony MDR-V6 Crossfeed
Many Hi-Fi earphones are prone to crosstalk between the two
earpieces.
The problem is notable in the Sony MDR-V6
earphones, which otherwise are excellent earphones.
The
problem results from a shared ground wire for the
two earphones.
If you feed one earphone a signal while
the other is connected to the output of a driver amplifier
(which may or may not be producing a signal--it doesn't
matter), the current fed in to the first earphone will divide
between the shared ground and the other earphone in
proportion to the impedances to ground at the point where
the two earphones are connected to the common ground.
This results in some of the current from the first earphone
taking a return path through the other earphone, such that
cross talk (in antiphase) occurs.
Our experience is that this
cross talk is roughly 30 dB below the signal in the earphone
that is used.
The cross talk can be eliminated by not
connecting the unused earpiece, but of course that is only a
workable solution for monaural experiments.

The cause (and amount) of cross talk can be visualized as
follows:



[ 本帖最后由 dabeat 于 07-9-11 21:49 编辑 ]

When the left earphone is fed a signal of, say, 64 mV the
1-mA current, which must return after passing through the
left earpiece, divides between the shared ground and the
right earpiece, whose "hot" end is connected to a virtual
ground (as far as the left earphone signal is concerned).
Thus, slightly less than 1 mA returns through the shared
ground (doing no harm) and slightly less than 1/64 mA
returns through the right earpiece and the right "hot" wire
(making an antiphase cross talk with an amplitude of about
1/64th of that in the left earpiece).

  This problem of cross talk surely is not unique to the Sony
MDR-V6, but applies to any (usually, Hi-Fi) earphone, which
uses a shared ground wire.  Because it is a question of
relative impedances, the problem is usually greater the lower
the impedance of the earphone is.  Certainly, the 63-ohm
nominal impedance of the Sony MDR-V6 makes it a
significant problem.

V6的声场和音箱是很接近的,我个人认为.

Sony MDR-V6 Crossfeed


我当年450元买二手V6，什么都不知道，后来还卖出去了，卖出去后，才看到BOB-L的文章，心凉了一截。看来要重新物色音频应用的新V6了。



由此看来，我开始怀疑我当时音箱的摆放存在问题（或者那音箱本身有问题），一直在错误的环境下mix，而可能不是耳机问题却误认为耳机声场艾挖

另外，我在民用创新声卡下能实现“硬件crossfeed”了，伟大的KX驱动就是牛挖。



;crossfeed.da
;---------------------------------------------------------
name "Crossfeed";
copyright "By LeMury 2003";
engine "kX";
created "08/23/2003";
comment "Headphones Crossfeed/Vocal Remover";
guid "6fa996e3-857e-4456-9865-a6cf624fc349";

input inl, inr ;
output outl, outr ;
control Lopass=1 ; lopass cuttoff freq
control Hipass=0 ; hipass cuttoff freq
control XPhase=1 ; xfeed phase 'select'
control Dry_Wet=0.5 ; direct/xfeed mix
static tl1=0x0
static tl2=0x0, hl2=0x0
static tr1=0x0
static tr2=0x0, hr2=0x0
temp tmp, tmpl, tmpr, f

; read inputs
macs tmpl, inl, 0, 0 ; get L dry sample
macs tmpr, inr, 0, 0 ; get R dry sample

exp f, Lopass, 0x7, 0x0 ; exp scale lp filter coef
; left lopass
macsn tmp, tmpl, tl1, 1 ;
macs tl1, tl1, tmp, f ; (tl1 is lp out)
; right lopass
macsn tmp, tmpr, tr1, 1 ;
macs tr1, tr1, tmp, f ; (tr1 is lp out)

; feed lopass output into hipass
exp f, Hipass, 0x7, 0x0 ; exp scale hp filter coef
; left hipass
macsn hl2, tl1, tl2, 1 ; tl1 is input to hp
macs tl2, tl2, hl2, f ; (hl2 is hp out)

; right hipass
macsn hr2, tr1, tr2, 1 ; tr1 is input to hp
macs tr2, tr2, hr2, f ; (hr2 is hp out)

; make inverted xfeed signals
macsn f, 0, hr2, 1
macsn tmp, 0, hl2, 1

; pan/'select' between normal and inverted xfeed signal
interp hr2, f, XPhase, hr2
interp hl2, tmp, XPhase, hl2

; pan/mix between dry and crossfeed sigal, output
interp outl, tmpl, dry_wet, hr2
interp outr, tmpr, dry_wet, hl2
;-----------------------------------------------------------------
end;







可惜只能在Audity1、2、2ZS、SBLive! 去实现了，emu的专业声卡不知道如何去实现。

那馬兄的環境及設施也應不錯吧.....

V6 的 crossfeed 和需要运算的crossfeed比，相信V6的感觉会来得自然及适量吧。况且它还不会令音质改变。

在国外的 Ultrasone 耳机也算得上是大牌子，也有类似这效果，
大卖文章的 S-Logic Natural Sorround Sound………….. 是不是"参考" V6 的 ?
http://www.ultrasone.com/htdocs/08_frameset/tech_index.html

这个小弟不清楚，但试听了一会，始终觉得它的特性比较适合家里玩高级音响的朋友。

除了音箱外，音场问题大多是环境中的低音共鸣而触发，
低音更是极难驾驭的东东。
要解决它，唯有用 $$$$$ 吧……….嘻…

http://www.audiobar.net/viewthread.php?tid=186040&extra=page%3D1

Ultrasone算是德国货中比较理性化的产品，小弟已经YY那个Proline2500很久了，就是太贵了，买不起。不知道dabeat 大大听的是哪一款？

德国耳机四大品牌中，只有森海赛尔一个牌子的大部分产品走向堕落，走市场化和时尚路线；拜亚动力（BeyerDynamic）也只有几款还行。而剩下两家歌德（MB Quart）和极致（Ultrasone）则在专心做产品，而且相对低调。


说真的，我很想拥有三个牌子的耳机： 一个是日系索尼的V6和7506，剩下的就是德系的极致和歌德了。