Thread: OPUS 20 second delay causing speaker "thump"

do you get the thump if its not plugged into the pc audio out?

Good diagnosing tip. I haven't thought about trying that. I will try tomorrow and let you know (it's a bit late now - UK). This would at least then let me know whether its the onboard sound causing the thump or the amps turning on.

In either case, what do you think is the best solution? I suppose I could get an external sound card (was hoping I didn't have to). Are there any other options? And what if it is the amps?

I don't get the "thump" on computer switch off (like many people with a "thump" problem do) so this would lead me to believe it is the onboard sound.

Thanks for your help,

LLOYDY

a problem often occurs due to ground loop isolation, caused generally by the ground connection of both devices, pc and amp not joined

what sort of pc is it, does it run on mains? dc converter?

My PC uses an OPUS 120W power supply. The whole system is the (expensive!) OPUS one from mp3car.com's shop. Both my amp and PC are grounded at the same point with a very good quality ditribution block.

I've done everything properly this is why I'm wondering why I'm getting this problem.

LLOYDY

I'm sure it is the soundcard. Even more annoying is the fact I've got a ground loop (alternator whine) and buying a ground loop isolator did nothing. Hopefully, a USB soundcard will sort all this out. Just have to wait until my funds are looking healthier!

LLOYDY

Not directly I don't think. How would I go about doing this? I assumed the case was grounded through the power lines entering the PSU.

Do I need to attach a ground cable to a bold on the card to the car chassis?

LLOYDY