分音器一問

請問分音器的線路主要由什麼組成(e.g coil , resistor , cap),what is the function of every components?what happen will occur  if i use the pro ac 's 分音器 in the other speaker?

U CAN'T DO THAT/NOT advice to do that..... unless the value of the coil, resister &cap of proAc is exactly the same as the speaker u 12 put in (rarely happen).

combination of R(resistant) & C (capacitant) can create a high pass filter /low pas filter depend on the way of arrangement...

F=1/2pi(RC) F=cut off frequency

u can get more info in internet just type in hihg pass filter /low pass filter..

Different tweeter & woofer & diffenrent design of box may have different suitable cut off frequency for the drive.... for e.g tweeter A may suit to has hi pass cut off at 2.5kHz, but tweeter B may suit for cut off at 4kHz, then the combination of RC will be different...

u just search from internet for DIY speaker &crossover...then u will get a lot info including some culcalation software...but still got variation during practical...

For more detail on culculation u better learn from shifu here like KK & Modo.

[quote:d7cf46b57b="dogman89"]請問分音器的線路主要由什麼組成(e.g coil , resistor , cap),what is the function of every components?what happen will occur  if i use the pro ac 's 分音器 in the other speaker?[/quote]


分音器主要是由電容及電感所組成的，而大家所見到的電阻只是作補償，因為線圈在頻率變動時是會改變阻抗，所以會以電阻作補償。

MODI SIR,

常看到分音器所用的电阻是5W/10W，真的需要用到那么大W的电阻吗？

[quote:403cc8a44c="WINDWSS"]MODI SIR,

常看到分音器所用的电阻是5W/10W，真的需要用到那么大W的电阻吗？[/quote]


是必須的，用最簡單的公式功率是P=VI，在分音器內電流會有幾百mA或以上，而輸出則為幾V以上，所以最好用10W或以上功率電阻。

Thank you modi sir,

可能我上次没仔细量(直接在音箱plug上量)，看到的是<2V & <1A。。

[quote:9b4365c648="WINDWSS"]Thank you modi sir,

可能我上次没仔细量(直接在音箱plug上量)，看到的是<2V & <1A。。[/quote]

假設喇叭是87dB/1W/1M時，擴音機便要輸出2.83V，所以不止2V那麼小呢！唔知有沒有人可以改正我的想法呢？

所以人們常說300B得8W輸出那麼小怎樣去推84dB的喇叭呢？
這都是錯誤的想法，其實是因為大部份300B為了保障自己的產品，
將300B的屏壓降至350V，令到輸出功率細至4-5W，但如果將屏壓加大，那麼300B的壽命便短了，所以DIY的300B一定要比足電啊！
其實要推84dB靈敏度的喇叭是不會難道300B的，
因為膽機是用牛輸出的，所以不會受到喇叭的阻抗變化的影響，
84dB---1W
87dB---2W
90dB---4W
93dB---8W
那麼大家想想家中聆聽環境是否很大，否則90dB已很大聲了，唔知大家認同與否？