標題: Bada DC222 'humming sound' [打印本頁] 作者: music111 時間: 2009-3-25 20:36 標題: Bada DC222 'humming sound' Hi guys,
I have Bada DC222 hybrid amplifier . I recently created speaker cables myself and started using it to connect the amp with Jamo S708 speakes.
After using the amp for about 5 minutes, the speaker is started to create hum sound.
I have earthing connected to amp.
Can you guys help me in this?作者: SSWONG 時間: 2009-3-26 09:27
does this only occurs when u use your DIY speaker cable?
is the speaker cable use create is using multiple cat5? how long the cable?
If IT ONLY HAPPEN with your DIY cable then the possibility is that...
1) your multiple twisted speaker cable have too high capacitance and create osilation
2) check your twisted cable, is there mix cable between positive and negative? (if u are using the twisted 27pair, u may mix them...i had done the mistake once)作者: music111 時間: 2009-3-26 14:03
Hi Windwss....thanks for your reply,
I have only this speaker cable...i dont have any other speaker cable.
I have used copper Teflon wire 14AWG plated with silver. The cable is created by using a total of six wires ...3 positive and 3 negative. I braid three wires into one and used for positive and negative. then i twisted both the braided wires like twisted pair.
Is braiding wrong?作者: alfcat 時間: 2009-3-26 17:49
Can you post us some photos?作者: music111 時間: 2009-3-27 00:03
hi alfcat
here is the image...
作者: ksw48 時間: 2009-4-3 14:26
Is the hum sound a low frequency ( 50 Htz) or higher one?作者: music111 時間: 2009-4-6 15:24
Hi,
The hum sound is coming from the side firing woofers of Jamo S708. The sound becomes huge in the evening time and less in the day time !!作者: ksw48 時間: 2009-7-8 15:00
I can't figure out why the hum is greater in the evening.
I suggest you to untwist the cable.
That is do not cross braid the wires. Let the positive and negative wire run parallel, and test the result.
Twisting or cross braid may create a lot of capacitance and make the amp unstable.作者: mikechw 時間: 2009-7-8 19:00
Either there is a ground loop in your setup...
and less in the day time !!