論壇 › 家庭影院 › YAMAHA AMP 用音壓計check 各聲道db 及autosetup 問題

kefana 發表於 2011-2-3 11:43

YAMAHA AMP 用音壓計check 各聲道db 及autosetup 問題

請問各yamaha機主,

你地用音壓計check各聲道ｄｂ　時．　
　
amp 既volume係咪擰到去０ｄｂ??

因為擰去0db 時 根本冇可能 調較各聲道 用音壓計set 既. 75db.

我全部前中置channel level -10db 用音壓計test 都around 80db.好似 "衰減得好多" gum.

另外 yamaha check angle個回力標　係咪放正皇帝位黎measure 就ok ??

thanks,

請各用家指點下.

Vader 發表於 2011-2-3 20:45

我唔係用y記！
不過我用過o同p啲amp，係同一個環境下我試過兩部amp都行auto!
結果出黎再用spl睇下！
O記係全部80db
P記係全部73db
如果要set75db，都係要手動set番！

jan97 發表於 2011-2-3 21:15

請問各yamaha機主,

你地用音壓計check各聲道ｄｂ　時．　
　
amp 既volume係咪擰到去０ｄｂ??

因為擰去0d ...
kefana 發表於 2011-2-3 11:43 http://www.post76.com/discuss/images/common/back.gif


For my case i am not very particular about getting 75dB if setting the reciever's volume to 0.This is just a reference.what is important is the sound pressure level for all speakers must be equal.This is what i do,average all speakers gain and then use it as a reference.If you set reciever at -18dB and SPL meter is getting 78db,adjust all speaker gain to this value. The user manual and instruction on the autosetup screen indicated that the tripod must be placed on the centre of the seat for 3 point measurement

kefana 發表於 2011-2-3 22:34

回復 3# jan97


    THANKS YOUR ADVISE.

that's mean if my case , when i use my amp usually the volume turn to -20db to watching movie,

i need to use the SPL metermeasure each channel ,

also turn the test tone vol to -20db, not 0db to measure right ??

cause i use denon amp & pioneer be4, i don't need to turn the volume for the channel test tone. when it's start, it set -0db.

jan97 發表於 2011-2-3 22:54

回復jan97


    THANKS YOUR ADVISE.

that's mean if my case , when i use my amp usually the volum ...
kefana 發表於 2011-2-3 22:34 http://www.post76.com/discuss/images/common/back.gif


对了。如果房里的噪音比较高的话，可以把声量调高才做测试。这能确保SPL的读数的
准确度。

randyma 發表於 2011-2-3 23:39

回復jan97


    THANKS YOUR ADVISE.

that's mean if my case , when i use my amp usually the volum ...
kefana 發表於 2011-2-3 22:34 http://www.post76.com/discuss/images/common/back.gif

http://www.post76.com/discuss/viewthread.php?tid=19082&highlight=%E9%9F%B3%E5%A3%93 Please see the link for using SPL meter.

kefana 發表於 2011-2-4 00:26

回復 6# randyma


    THANKS , BUT.....

當你進入(Channel Level)設定時侯VOL是不能作出大小調校的,所以不用理會,而dB意思即代表擴音機輸出的音壓,明白嗎.

但係yamaha 既channel level vol 係有得較.

同埋 0db 時 既 channel level . 用spl meter check 我中置 channel level -10db (冇得再減)都未能配合到 spl 去到 75db 既標準.

所以至post 以上問題同各c hing 解答一下.

jan97 發表於 2011-2-4 00:37

回復randyma


    THANKS , BUT.....

當你進入(Channel Level)設定時侯VOL是不能作出大小調校的,所以 ...
kefana 發表於 2011-2-4 00:26 http://www.post76.com/discuss/images/common/back.gif


请问大哥的中置是否已其他的喇叭像同的牌子？centre channel level at -10dB what is your reading on the SPL meter?另外的解决方法就是把其他喇叭的gain给调高来配合你的中置的音量

kefana 發表於 2011-2-4 00:55

回復 8# jan97


    好多謝 大哥既回覆,

前中置都係cheap cheap 既klipsch RF-52座地 同 RC-52 中置.

-10db 後 spl 既讀數係 80db 左右.

至於你提議 adjust gain 去 調教 中置既音量,

係咪係 parmaeter eq 入面 adjust gain ??

因本人對eq 既知識 係 0...... 望師兄 多加指點.

many many thanks

randyma 發表於 2011-2-4 11:02

回復randyma


    THANKS , BUT.....

當你進入(Channel Level)設定時侯VOL是不能作出大小調校的,所以 ...
kefana 發表於 2011-2-4 00:26 http://www.post76.com/discuss/images/common/back.gif

Youcan adjust levelto reduce and use meter to measure until 75 or 78. I will use 78 instead of 75.

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