分頻設(shè)計詳述
C1 = 0.1590 / RH FH L1 = 0.0500 RM / FM
C2 = 0.5070 / RM FM L2 = 0.1592 RL / FL
Second -Order線路圖
Second -Order ( I ) 中音增益2.08dB中音反相接
C1 = 0.0791 / RH FH L1 = 0.3202 RH / FH
C2 = 0.3236 / RM FM L2 = 1.0291 RM / FM
C3 = 0.0227 / RM FM L3 = 0.0837 RM / FM
C4 = 0.0791 / RL FL L4 = 0.3202 RL / FL
Second -Order ( II ) 中音增益2.45dB中音反相接
C1 = 0.78 / RH FH L1 = 0.3217 RH / FH
C2 = 0.3046 / RM FM L2 = 0.9320 RM / FM
C3 = 0.0248 / RM FM L3 = 0.0913 RM / FM
C4 = 0.0788 / RL FL L4 = 0.3217 RL / FL
Third -Order ( I ) 中音增益1.6dB 中音正相接
C1 = 0.0995 / RH FH L1 = 0.1191 RH / FH
C2 = 0.3402 / RH FH L2 = 0.0665 RM / FH
C3 = 0.0683 / RM FM L3 = 0.0233 RM /FM
C4 = 0.3125 / RM FM L4 = 0.4285 RM / FM
C5 = 148 / RM FM L5 = 0.2546 RL / FM
C6 = 0.2126 / RL FL L6 = 0.0745 RL / FL
Third -Order ( II ) 中音增益2.1dB中音正相接
C1 = 0.0980 / RH FH L1 = 0.1190 RH / FH
C2 = 0.3459 / RH FH L2 = 0.0711 RM / FM
C3 = 0.0768 / RM FH L3 = 0.1254 RM / FM
C4 = 0.2793 / RM FM L4 = 0.3951 RM / FM
C5 = 1.061 / RM FM L5 = 0.2586 RL / FL
C6 = 0.2129 / RL FL L6 = 0.0732 RL / FL
Third -Order ( III ) 中音增益0.85dB中音反相接
C1 = 0.1138 / RH FH L1 = 0.1191 RH / FH
C2 = 0.2976 / RH FH L2 = 0.0598 RM / FM
C3 = 0.0765 / RM FM L3 = 0.0253 RM / FM
C4 = 0.3475 / RM / FM L4 = 0.3789 RM / FM
C5 = 1.068 / RM FM L5 = 0.2227 RL / FL
C6 = 0.2127 / RL FL L6 = 0.0852 RL / FL
Third -Order ( IV ) 中音增益0.99dB中音反相接
C1 = 0.1158 / RH FH L1 = 0.1189 RH / FH
C2 = 0.2927 / RH FH L2 = 0.0634 RM / FM
C3 = 0.0844 / RM FM L3 = 0.0284 RM / FM
C4 = 0.3112 / RM FM L4 = 0.3395 RM / FM
C5 = 0.9667 / RM FM L5 = 0.2187 RL / FL
C6 = 0.2130 / RL FL L6 = 0.0866 RL / FL
Fourth - Order線路圖
Fourth - Order ( I ) 中音增益2.28dB中音正相接
C1 = 0.0848 / RH FH L1 = 0.1004 RH / FH
C2 = 0.1686 / RH FH L2 = 0.4469 RM / FH
C3 = 0.3843 / RM FM L3 = 0.2617 RM / FM
C4 = 0.5834 / RM FM L4 = 1.423 RM / FM
C5 = 0.0728 / RM FM L5 = 0.0939 RM / FM
C6 = 0.0162 / RM FM L6 = 0.0445 RM / FM
C7 = 0.2523 / RL FL L7 = 0.2987 RL / FL
C8 = 0.0567 / RL FL L8 = 0.1502 RL / FL
Fourth - Order ( II ) 中音增益2.84dB中音正相接
C1 = 0.0849 / RH FH L1 = 0.1007 RH / FH
C2 = 0.1685 / RH FH L2 = 0.4450 RH / FH
C3 = 0.3774 / RM FM L3 = 0.2224 RM / FM
C4 = 0.5332 / RM FM L4 = 1.273 RM / FM
C5 = 0.0799 / RM FM L5 = 0.1040 RM / FM
C6 = 0.0178 / RM FM L6 = 0.0490 RM / FM
C7 = 0.2515 / RL FL L7 = 0.2983 RL / FL
C8 = 0.0569 / RL FL L8 = 0.1503 RL / FL
很復(fù)雜嗎?不用怕只是舉一點(diǎn)例子,實際使用時不是全部使用的。何況現(xiàn)在已經(jīng)可以用計算機(jī)程序計算.所以大家不用擔(dān)心。除了分頻電路外還需加上以下電路使做出來分音器的效果更加完美:
降低高音靈敏度電路圖
一般高音的靈感度都會比低音高出幾dB,所以要用這個電路來使高,低音的靈敏度平衡.
編注:使用這個衰減網(wǎng)絡(luò)時,要記得以下幾點(diǎn)
打算衰減多少dB來配合?注意,就電壓增益N倍來說來說,以dB表示的算式為
20LOG N。假設(shè)衰減十倍,則為衰減 20LOG10=20dB。反過來看,如果打算衰減6dB,則為衰減二分之一(20LOG0.5=-6dB)
衰減網(wǎng)絡(luò)加入前后的總阻抗不變:假設(shè)我們原先設(shè)計分音網(wǎng)絡(luò)時以
阻抗RL為假設(shè),則加入兩個電阻后的阻抗:
R1+(R2//RL)=RL,其中R2//RL表示為兩電阻并聯(lián),其合成阻抗為1/(1/R2+1/RL)
高音阻抗補(bǔ)償電路圖
高音阻抗補(bǔ)償電路 :
我們知道單元的阻抗不是直線而是曲線,所以我們要設(shè)法把這條曲線拉得比較平直點(diǎn).
C = 0.1592 / (RE Qes fs )
L = 0.1592 (Qes RE ) / fs
R = RE + ( Qes RE )/Qms
式中的:RE, Qes, Qms, fs可以在單元的數(shù)據(jù)中找到。
只要代入式中便可以找到答案。
現(xiàn)在很多高音的阻抗都已經(jīng)很平直了,所以也可以不用這個電路。
低音阻抗補(bǔ)償電路 : 低音阻抗補(bǔ)償電路圖
上面已經(jīng)提過單元的阻抗不是一條直線,而低音的阻抗曲線就更難看。在低音的阻抗曲線上,我們可以看到低頻段及中頻段兩點(diǎn)的阻抗值更升到30 Ohm以上.如果要把低頻段的阻抗拉到平直是很難的,所以一般都不會理會,我們主要是把中頻段的阻抗拉得平直一點(diǎn)。
R = 1.25 RE
C = Le / R2
式中的
RE = 低音單元的直流電阻值
Le = 低音單元的電感值
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