review33.com:影音天地:DIY 喇叭電阻問題

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[#1] DIY 喇叭電阻問題 HI 各位師兄, 現DIY 對喇叭, 但發現兩隻底音單元的電阻分別吾相同, 它標示8 ohm, 但度到一隻係6.2 ohm , 另一隻 5.6 ohm, 與8 ohm 相差好多, 正常嗎? 還有我是否需要額外加電阻去平衡聱音大小? 麻煩大家幫忙. 謝謝!		yeungch903 會員 221.xxx.xxx.13	2020-04-27 22:08

[#2] DIY 喇叭電阻問題
一般情況下唔需要，隻 driver voice-coil resistance ~5.7 ohms。

http://www.seas.no/images/stories/vintage/pdfdataheet/h0702_t14rcyp-h.pdf

最後修改時間: 2020-04-27 22:38:23

長長影子

正式會員
165.xxx.xxx.80

2020-04-27 22:36

[#3] DIY 喇叭電阻問題
8ohm is impedance (AC resistance), it also includes the measure frequency so it is normal.

41450686

會員
61.xxx.xxx.216

2020-04-28 00:00

[#4] DIY 喇叭電阻問題
明白，真的吾該兩位，Thank you!

yeungch903

會員
14.xxx.xxx.191

2020-04-28 00:12

[#5] DIY 喇叭電阻問題
明白，真的吾該兩位，Thank you!

yeungch903

會員
14.xxx.xxx.191

2020-04-28 00:12

[#6] DIY 喇叭電阻問題
相差直流电阻10%，又少d 喎

254mm

正式會員
1.xxx.xxx.55

2020-04-28 08:57

[#7] DIY 喇叭電阻問題
我想指一个5.6ohm , 另一个可能5.8或5.9ohm 咋

最後修改時間: 2020-04-28 09:20:51

254mm

正式會員
1.xxx.xxx.55

2020-04-28 09:19

[#8] DIY 喇叭電阻問題
數值誤差可能出自量度儀器，樓主可以試下度多幾次看看係咪都出返相同數值。因為通常度低電阻他錶誤差比較大。

DYreal

會員
119.xxx.xxx.115

2020-04-28 09:25

[#9] DIY 喇叭電阻問題
仲要量度的時候，唔好用手㩒㩒下個喇叭振盆。

mcc2018

會員
218.xxx.xxx.114

2020-04-28 09:34

[#10] DIY 喇叭電阻問題
Re
Measured in ohms (Ω), this is the DC resistance (DCR) of the voice coil, best measured with the cone blocked, or prevented from moving or vibrating because otherwise the pickup of ambient sounds can cause the measurement to be unreliable. Re should not be confused with the rated driver impedance, Re can be tightly controlled by the manufacturer, while rated impedance values are often approximate at best. American EIA standard RS-299A specifies that Re (or DCR) should be at least 80% of the rated driver impedance, so an 8-ohm rated driver should have a DC resistance of at least 6.4 ohms, and a 4-ohm unit should measure 3.2 ohms minimum. This standard is voluntary, and many 8 ohm drivers have resistances of ~5.5 ohms, and proportionally lower for lower rated impedances.

https://en.wikipedia.org/wiki/Thiele/Small_parameters

長長影子

正式會員
165.xxx.xxx.80

2020-04-28 09:56

[#11] DIY 喇叭電阻問題
跟據以往經驗，大廠喇叭 driver 出貨 DCR tolerance 大概+/-5%，普通大概+/-10%。

長長影子

正式會員
165.xxx.xxx.80

2020-04-28 10:05

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