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[#1] 膽前有hum 師兄們,小弟最近加咗部膽前級,有分體電源,當接好電源線同訊號線之後,就算未著機喇叭都有hum,而且無論volume較大或細,啲hum都係一樣,所以我估應該係ground loop hum,嚟緊我想試吓甩電源線嘅earth,請問各位師兄我應該甩後級定前級呢?但考慮到後級係用20A供電、所以係咪應該甩膽前earth呢?麻煩各位師兄賜教小弟,感激感激! 最後修改時間: 2021-01-26 15:00:37 |
karfso![]() 14.xxx.xxx.1 |
2021-01-26 14:57 | |
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[#2] 膽前有hum 甩咗個地線try幾秒啦.... U sure it is hum but not other noise? 最後修改時間: 2021-01-26 15:03:45 |
hahayanyan![]() 49.xxx.xxx.177 |
2021-01-26 15:03 |
[#3] 膽前有hum 唔該師兄,因為我只係著咗部後級無著部膽前都有hum,咁情況我估最大可能性係common ground有電位差,但唔確定咁諗法啱唔啱,依家係考慮緊到底係甩膽前定後級嘅地呢。 |
karfso![]() 14.xxx.xxx.1 |
2021-01-26 15:15 |
[#4] 膽前有hum 亦有可能係咪高峰效應,你試打開機殻,甚至伸手接近膽聽聽,如係的話要擺另一個位。 |
koalaau![]() 45.xxx.xxx.182 |
2021-01-26 16:13 |
[#5] 膽前有hum 噚晚試過放手喺膽側邊都係咁,今晚會試吓擺另一個位置,多謝師兄提點。 |
karfso![]() 14.xxx.xxx.1 |
2021-01-26 17:00 |
[#6] 膽前有hum 有無試過無接後級之下(用他錶mV)度吓前級輸出有無noise? Ground loop 通常一接後級先有noise, 唔接之下大家係好靜無事 |
kit271![]() 182.xxx.xxx.225 |
2021-01-26 19:10 |
[#7] 膽前有hum 對於大部份嘅音響系統而言,整套系統只有一部器材接地線,會最寧靜最好聲 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-26 19:15 |
[#8] 膽前有hum 情況比想像中難搞,試咗甩膽前條地,有hum;跟住甩膽前分體電源,有hum;rca訊號線改插main output 2,有hum;直至訊號線插rec out先無hum;但呢個駁法會disable膽前volume control,即係rca訊號線要再經另一部前級放大?請問各位師兄咁部膽前會唔會形同虛設呢? |
karfso![]() 14.xxx.xxx.55 |
2021-01-26 22:04 |
[#9] 膽前有hum Stupid question... U sure it is hum but not other noise.. Such as tube noise.. Etc..? U only connect preamp to power amp and to speaker.. Without any sources? Then.. If u still believe it is hum... Lift the ground of the power amp and put back the ground of the pre amp.... If it is ground hum... It is either one of them... For this test... I suppose 最後修改時間: 2021-01-26 22:22:19 |
hahayanyan![]() 49.xxx.xxx.147 |
2021-01-26 22:20 |
[#10] 膽前有hum 前級輸入接駁咗幾多部source? 試吓逐個掹走睇吓會唔會冇咗hum 如果淨係其中一個source 駁左先至會有hum,咁就前級落地,引致問題嗰個source飛起水線 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-26 22:28 |
[#11] 膽前有hum 如果未着機都有hum (樓主講嘅未着機係咪講緊新加入嘅前級?) 真係似ground loop 多啲 不過都要注意新加入嘅前級嘅分體電源及其電源線有沒有放得好近訊號線 最後修改時間: 2021-01-26 22:50:18 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-26 22:42 |
[#12] 膽前有hum But u did mention such things happens even with the pre amp was switched off...off mean completely off without standby? Does this preamp have standby mode? I have a phono stage... Only have ground hum with one preamp.. But not the other.. I am lucky.. It was solved by lifting the ground with that phono with that preamp.... Good luck 最後修改時間: 2021-01-26 22:47:25 |
hahayanyan![]() 49.xxx.xxx.147 |
2021-01-26 22:44 |
[#13] 膽前有hum 多謝咁多位師兄俾意見,可能我文字表達得唔好,所以畫咗幅圖希望可以清楚啲話俾各師兄了解,謝謝大家! ![]() |
karfso![]() 14.xxx.xxx.55 |
2021-01-27 00:38 |
[#14] 膽前有hum Setup 1 試吓飛起Solid state pre to power amp 嗰一對XLR 訊號線 其餘所有sources 照樣接駁到膽前級 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-27 01:37 |
[#15] 膽前有hum 不過我都想再問一次,Setup 1 是否Tube pre 處於關機狀態都有hum? |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-27 01:49 |
[#16] 膽前有hum setup 1個獨立供電同部膽前已分離都有hum,所以感覺上能量來自後級經,聽晚會試吓甩凈膽前同石後再報告各師兄,謝謝大家幫忙! |
karfso![]() 14.xxx.xxx.55 |
2021-01-27 02:02 |
[#17] 膽前有hum 不知噪音如何,會否是線問題?試換對訊號線試下。 |
koalaau![]() 45.xxx.xxx.182 |
2021-01-27 02:12 |
[#18] 膽前有hum 唔好客氣,我都在此吸收緊經驗 我仲講留咗一樣野,我以前玩Graaf GM200 後級, 部機都係可以用XLR 或者RCA 輸入,用RCA 輸入嘅時候,XLR 冇入訊號嗰隻腳要用一隻 U 形腳 short落地,目的就係要減低XLR 空置左嘅輸入點帶嚟嘅噪音 期望你今晚拆除左後級XLR 輸入嗰兩條線,可以解決到問題 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-27 11:00 |
[#19] 膽前有hum may be u need to lift the ground of the XLR from the DAC to the SS preamp.....never know but back to basic----- step 101... this pre amp with the power amp only--- step one step 2...is adding the SS pre amp step 3 is adding the DAC..etc.. then add one piece at a time..., until u find out the culprit... no choice ..if those noise appeared... and u had try that approach.. one by one.. is suggested only take u one hour..and then all cable will be tidy up too..haha 最後修改時間: 2021-01-27 11:35:30 |
hahayanyan![]() 49.xxx.xxx.189 |
2021-01-27 11:27 |
[#20] 膽前有hum any luck ? |
hahayanyan![]() 49.xxx.xxx.240 |
2021-01-28 14:38 |