481 Like
10 Dislike
ninjabigboss
2019-01-01 01:43:15
有common mode rejection 周邊電器的影響會少好多
BD-ROM
2019-01-01 01:44:20
我答到你我就唔係DIY撚,係Research撚了
不過我覺得AMP嘅功用就應該只係amplify current, nothing more,唔應該做所謂嘅系統整體睇,AMP自身應該係一個完整獨立嘅系統,如果真如你所言高頻有phase shift,咁就唔好了
ninjabigboss
2019-01-01 01:45:04
咁應該係KEF LSX 的電源RFI filter 造得唔好,或者你其他電器ground loop左
ninjabigboss
2019-01-01 01:46:49
個人睇法係,amp係夠watt數夠低THD 的情況下,分別不太大
IT唔係狗
2019-01-01 01:56:37
係唔係仲要睇output impedance?
好似會影響frequency response
ninjabigboss
2019-01-01 01:58:54
近代DAC同amp唔駛點理,應該DAC output impedance 一般都around 100ohm or lower,amp的inout impedance at least 10k ohm,所以已經夠damping factor 亦唔會有 frequency roll off
BD-ROM
2019-01-01 02:00:08
同埋class D有高頻phase shift應該係因為輸出有low pass filter
BD-ROM
2019-01-01 02:02:16
impedance會影響power都phase,所以係
但係如果部AMP係feedback型就唔洗理impedance matching
Fun
2019-01-01 02:03:48
講低THD,大部分amp都做到極低0.0幾%。照道理無可能影響到SQ
咁佢地既分別只係watt分別?
最大失真都係speakers身上
ninjabigboss
2019-01-01 02:06:57
AMP THD 你要睇出緊幾多watt
amp spec o個THD 無標準,有時@1%,有時@10%
正常話聽唔出,但speaker impedance 唔同frequency都唔同架,所以好複雜
BD-ROM
2019-01-01 02:07:16
唔係,要睇佢地個THD係點度出嚟,AMP嘅electrical characteristic能唔能夠隨output power改變而依然保持穩定先係好機
7ha7ha
2019-01-01 02:07:56
一對Hi End spk 例如Wilson Audio ,其實唔使d咩貴缐貴amp,就咁一部3-4萬合併機已經出到好好聲
ninjabigboss
2019-01-01 02:11:07
我其實唔理,我用active 的,已achieve linear phase response
反而用passive 的話,就唔知個phase 點夾啦……本來multiway speaker個phase 就唔會linear 的,除非有DSP。所以我自己係整個系統睇
ninjabigboss
2019-01-01 02:12:15
其實Wilson Audio有幾勁呢?願聞其詳
ninjabigboss
2019-01-01 02:13:21
side business代理pro gear同搞room acoustics,自學mastering中
BD-ROM
2019-01-01 02:18:17
無filter係無phase shift,無論係passive定active定digital
ninjabigboss
2019-01-01 02:30:50
speaker phase response 呀,multiway speaker 就有crossover,有eq就有phase shift 架啦,除非用dsp FIR filter 做crossover 或之後做correction
詳看Floyd 大的書
門鎖好味
2019-01-01 02:51:40
咩牌子
ninjabigboss
2019-01-01 02:53:15
HEDD Audio Monitor, Sonarworks
門鎖好味
2019-01-01 02:55:22
reference 4 係咪可以apply 條eq 係個mon 到? 定係要係mon 自己條eq 度較?
BD-ROM
2019-01-01 02:56:21
我唔明你講咩,phase shift或者frequency response同active passive無關係
一個active filter嘅response絕對可以用passive砌返出嚟
ninjabigboss
2019-01-01 03:01:53
唔明好正常
有興趣可以睇下loudspeaker design相關資料,phase response 一般好少人理
ninjabigboss
2019-01-01 03:03:25
用sonarworks plugin in DAW,或用sonarworks 自帶軟件systemwide process all system audio
唔駛o係mon度較
日向葵海
2019-01-01 03:05:10
割人話邊個比錢我咪話邊個好聲