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| What is purpose of this pcb inside my Dali subwoofer? |
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| erikbrenn:
Inside my Dali Basis Sub I see this PCB mounted on the back of the preamp board, just behind the line input RCA connectors. There is a foam pad between it and the preamp pcb. The trace around the edge is connected to ground in two places What is the purpose of this? Ground plane noise suppression? |
| Icchan:
If that's not an EMI shield, I might go back to school... :D It's most probably there to shield either the amplifier circuitry, or trying to prevent the amp from emitting crap all over the place. Why separate PCB? Because they did penny pinching and didn't use 4-layer boards int eh main PCB and couldn't integrate the shielding to the main PCB so it had to be separate. Metal cans are expensive, metal enclosures are expensive... so that was their solution. |
| erikbrenn:
Thanks a lot, that makes sense. While on the topic of saving money, they also used a cheap ass cable like this soldered directly to the preamp and power-amp boards, and it's broken. I'm thinking of just replacing it with a 8-pin JST type connector cable. Are there any benefits to using a flat cable like this in an audio context? |
| coppercone2:
no that cable is a piece of shit you find it in things people consider cheap bull shit. its cheaper to make. The wires are a bit separated but I never seen that cable in anything but the cheapest crap |
| SiliconWizard:
Sinclair loved that kind of flat cables. That must be telling something. :-DD (Don't get me wrong, I hugely respect the guy and his achievements, but not really for the quality of his products.) |
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